Anatomy of Dicot & Monocot Organs — Practice Questions

Free NEET Biology multiple-choice questions on Anatomy of Dicot & Monocot Organs. Attempt each question and reveal the answer with a full explanation.

Which type of joint does not allow any movement and is found between the flat skull bones? Fibrous joint Cartilaginous joint Synovial joint Ball and socket joint Which hormone is primarily responsible for the 'milk-ejection reflex' during breastfeeding? Oxytocin Prolactin Estrogen Progesterone Vascular bundles where xylem and phloem are arranged alternately on different radii are known as: Radial Conjoint Collateral Open In the human skeletal system, the ankle is composed of how many tarsal bones? 7 8 5 14 In the human eye, the ciliary body continues forward to form a pigmented and opaque structure called the: Iris Retina Pupil Cornea What is the average lifespan of human Red Blood Cells ( RBCs ), after which they are destroyed in the spleen? 120 days 60 days 10 days 180 days Which light-sensitive cells of the retina are responsible for 'Scotopic vision' (twilight vision)? Rods Cones Amacrine cells Bipolar cells The 'Blind Spot' in the human eye is the region where: Optic nerves leave the eye and retinal blood vessels enter it Only cones are densely packed The resolution is highest The vitreous humor is produced Which region of the retina contains only cones and is the point of greatest visual acuity? Fovea centralis Optic disc Macula lutea Iris The hormone 'Thymosin' plays a major role in the differentiation of: T-lymphocytes B-lymphocytes Erythrocytes Thrombocytes What is the primary function of the 'Choroid' layer in the human eye? Preventing internal reflection of light Refracting light onto the retina Providing the color of the eye Adjusting the size of the pupil The 'Fovea' in the mammalian eye is the center of the visual field where: High density of cones occur, and rods are absent Only rods are present The optic nerve leaves the eye The optic nerve and blood vessels enter the eye Which of the following plasma proteins is primarily involved in the coagulation of blood? Fibrinogen Albumin Globulin Haemoglobin In the human eye, 'Photopic vision' (daylight vision) and color vision are functions of: Cones Rods Blind spot Choroid The space between the cornea and the lens is called the aqueous chamber and contains a thin watery fluid. Where is this fluid drained through? Canal of Schlemm Vitreous humor Fovea centralis Optic disc The mechanism of concentration of filtrate in the mammalian kidney involves the Loop of Henle acting as a: Counter-current multiplier Counter-current exchanger Passive filter Selective secretory unit The part of the internal ear that is specifically responsible for maintaining static equilibrium and detecting linear acceleration is: Macula of the saccule and utricle Crista ampullaris Organ of Corti Scala media The lymphatic system is responsible for draining excess tissue fluid back into the blood. Which large lymphatic vessel drains the majority of the body's lymph into the left subclavian vein? Thoracic duct Right lymphatic duct Cisterna chyli Lacteal Which of the following describes the mechanism of action of 'Steroid hormones'? They cross the cell membrane and bind to intracellular receptors to regulate gene expression They bind to membrane receptors and generate secondary messengers like cAMP They activate ion channels on the plasma membrane directly They are degraded in the extracellular fluid to release active fragments Which specific part of the 'Adrenal Gland' is derived from the ectoderm and secretes catecholamines? Adrenal Medulla Zona Glomerulosa Zona Fasciculata Zona Reticularis Which of the following hormones utilizes Inositol Triphosphate ( IP 3 ) as a secondary messenger? Oxytocin Insulin Glucagon Testosterone In the process of blood clotting, which factor is known as the 'Hageman Factor'? Factor XII Factor VIII Factor X Factor XIII Nitrogenous waste is excreted in the form of uric acid pellets or paste by which of the following sets of animals? Pavo (Peacock), Vipera (Viper), Periplaneta (Cockroach) Rana (Frog), Hippocampus (Sea horse), Catla Pila, Shark, Camel Salamandra, Exocoetus, Lizards In a standard Electrocardiogram (ECG), the T-wave represents which of the following physiological events? Return of the ventricles from excited to normal state (Repolarization) Depolarization of the atria Depolarization of the ventricles Beginning of the ventricular systole Which type of nephron is characterized by having a very long Loop of Henle that runs deep into the inner medulla? Juxtamedullary nephrons Cortical nephrons Superficial nephrons Mid-cortical nephrons In which respiratory disorder are the alveolar walls damaged, resulting in a decrease in the respiratory surface area, often caused by cigarette smoking? Emphysema Asthma Bronchitis Pneumonia A symptom of acute chest pain appearing when no enough oxygen is reaching the heart muscle is called: Angina Pectoris Heart Failure Cardiac Arrest Atherosclerosis Carbon monoxide ( CO ) is highly toxic because its affinity for haemoglobin is approximately how many times higher than that of oxygen ( O 2 )? 200-250 times 10-20 times 500 times 1000 times What is the primary role of the 'Enterokinase' enzyme in the digestion process? Activation of Trypsinogen into Trypsin Activation of Pepsinogen into Pepsin Emulsification of fats Conversion of proteins into dipeptides Which hormone, secreted by the heart, causes vasodilation (dilation of blood vessels) and thereby decreases the blood pressure? Atrial Natriuretic Factor (ANF) Renin Angiotensin II Aldosterone What is the term for the cluster of cells in the kidney that includes the Bowman's capsule and the glomerulus? Malpighian body Renal papilla Columns of Bertini Juxtaglomerular apparatus During inspiration, what change occurs in the shape of the diaphragm and the volume of the thoracic cavity? Diaphragm flattens and thoracic volume increases Diaphragm becomes dome-shaped and thoracic volume increases Diaphragm flattens and thoracic volume decreases Diaphragm becomes dome-shaped and thoracic volume decreases The condition called 'Mountain Sickness' at high altitudes is primarily due to: Low partial pressure of oxygen High partial pressure of CO 2 Decreased number of RBCs Increased affinity of haemoglobin for oxygen Which hormone is responsible for the 'Gastro-colic reflex' and stimulates the secretion of HCl and pepsinogen in the stomach? Gastrin Secretin Cholecystokinin Enterogastrone The thin, transparent vascular membrane that covers the brain and contains many blood vessels is called: Pia mater Dura mater Arachnoid mater Corpus callosum The total thickness of the diffusion membrane in the human lungs, which consists of the squamous epithelium of alveoli, the endothelium of alveolar capillaries, and the basement substance between them, is: Much less than a millimetre About 2-3 mm Around 5 mm Exactly 1 cm Which part of the Loop of Henle is virtually impermeable to water but allows the transport of electrolytes like NaCl actively or passively? Ascending limb Descending limb Proximal Convoluted Tubule Collecting duct A healthy individual's kidneys filter about 125 ,mL of blood per minute. What is the total volume of glomerular filtrate produced per day? 180 Litres 18 Litres 1.5 Litres 5 Litres The Respiratory Quotient ( RQ ) for proteins is approximately: 0.9 0.7 1.0 More than 1.0 Which of the following describes the function of 'Iodopsin' in the retina? Photopic (color) vision in daylight Scotopic (twilight) vision Regulating the size of the blind spot Absorption of excess vitamins Colostrum, the yellowish fluid secreted by the mother during the initial days of lactation, is rich in which antibody? IgA IgG IgE IgM The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is - Differentiating Maturing Elongating Widening Palisade parenchyma is absent in leaves of - Gram Sorghum Mustard Soybean Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by : Position of protoxylem absence of secondary xylem Absence of secondary phloem Presence of cortex You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two? Secondary xylem Secondary phloem Protoxylem Cortical cells The layer of connective tissue that covers each hepatic lobule in the liver is known as: Glisson's capsule Bowman's capsule Hepatic capsule Fascia The transverse section of a plant shows following anatomical features : (a) Large number of scattered vascular bundles surrounded by bundle sheath (b) Large conspicuous parenchymatous ground tissue (c) Vascular bundles conjoint and closed (d) Phloem parenchyma absent Identify the category of plant and its part : Monocotyledonous root Dicotyledonous stem Dicotyledonous root Monocotyledonous stem Select the correct pair. In dicot leaves, vascular bundles are surrounded by large thick-walled cells - Conjunctive tissue Cells of medullary rays that form part of cambial ring - Interfascicular cambium Loose parenchyma cells rupturing the epidermis and forming a lens shaped opening in bark - Spongy parenchyma Large colorless empty cells in the epidermis of grass leaves - Subsidiary cells Read the following statements about the vascular bundles : (a) In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii. (b) Conjoint closed vascular bundles do not possess cambium (c) In open vascular bundles, cambium is present in between xylem and phloem (d) The vascular bundles of dicotyledonous stem possess endarch protoxylem (e) In monocotyledonous root, usually there are more than six xylem bundles present Choose the correct answer from the options given below : (b), (c), (d) and (e) Only (a), (b), (c) and (d) Only (a), (c), (d) and (e) Only (a), (b) and (d) Only Given below are two statements : Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body. Statement II : Exarch condition is the most common feature of the root system. In the light of the above statements, choose the correct answer from the options given below: Both Statement I and Statement II are true Both Statement I and Statement II are false Statement I is correct but Statement II is false Statement I is incorrect but Statement II is true In the given figure, which component has thin outer walls and highly thickened inner walls? C D A B Match List-I with List-II : array llll ; & List-I & ; & List-II A. & Conjunctive tissue & I. & Specialised cells in the vicinity of guard cells B. & Casparian strips & II. & Endodermal cells rich in starch C. & Subsidiary cells & III. & Tissue between xylem and phloem D. & Starch sheath & IV. & Endodermal cells with suberin deposition array Choose the correct answer from the options given below : A-IV, B-III, C-II, D-I A-III, B-IV, C-I, D-II A-IV, B-III, C-I, D-II A-III, B-IV, C-II, D-I The protoxylem in roots is described as 'Exarch'. This means that: Protoxylem lies towards the periphery and metaxylem towards the centre Protoxylem lies towards the centre and metaxylem towards the periphery Protoxylem and metaxylem are arranged in the same radius Protoxylem is absent Which of the following is a feature of 'conjoint closed' vascular bundles? Xylem and phloem are on the same radius and cambium is absent Xylem and phloem are on different radii Cambium is present between xylem and phloem Xylem surrounds the phloem completely The specialized group of cells in the distal convoluted tubule that come into contact with the afferent arteriole to form the Juxtaglomerular Apparatus (JGA) is called: Macula densa Podocytes Mesangial cells Juxtaglomerular cells Which type of leucocytes are characterized by a kidney-shaped nucleus and are the largest of all WBCs, functioning as phagocytes? Monocytes Lymphocytes Neutrophils Basophils The second heart sound (Dub) is produced during which phase of the cardiac cycle? Closure of semilunar valves at the start of ventricular diastole Closure of bicuspid and tricuspid valves Opening of semilunar valves Atrial systole Which hormone is secreted by the 'corpus luteum' after ovulation and is essential for the maintenance of the endometrium? Progesterone Estrogen LH FSH The condition 'Gout' is caused by the accumulation of: Uric acid crystals Calcium oxalate Lactic acid Urea In the eye, the space between the lens and the retina is called the: Vitreous chamber Aqueous chamber Canal of Schlemm Fovea centralis 'Addison's disease' is caused by the hyposecretion of hormones from which endocrine gland? Adrenal cortex Thyroid gland Pancreas Pituitary gland The 'P-wave' in a standard Electrocardiogram (ECG) represents: Atrial depolarization Ventricular depolarization Atrial repolarization Ventricular repolarization Which hormone is known as the 'emergency hormone' because it prepares the body for 'fight or flight'? Adrenaline Insulin Calcitonin Melatonin In a human heart, the 'Bicuspid valve' (Mitral valve) guards the opening between: Left atrium and left ventricle Right atrium and right ventricle Right ventricle and pulmonary artery Left ventricle and aorta The primary site of gas exchange in the human respiratory system is the: Alveoli Trachea Bronchioles Diaphragm In a healthy adult human, what percentage of the glomerular filtrate is typically reabsorbed by the renal tubules? 99 % 50 % 75 % 10 % Which specific lymphoid organ is known as the 'graveyard of RBCs' where worn-out erythrocytes are destroyed? Spleen Thymus Tonsils Lymph nodes Which hormone is a 'Glucocorticoid' that also acts as an immunosuppressant and anti-inflammatory agent? Cortisol Aldosterone Adrenaline Melatonin What is the correct sequence of the meninges of the human brain from the outside to the inside? Dura mater -> Arachnoid -> Pia mater Pia mater -> Arachnoid -> Dura mater Arachnoid -> Dura mater -> Pia mater Dura mater -> Pia mater -> Arachnoid The light-sensitive pigment 'Rhodopsin' in the rod cells of the retina contains a derivative of: Vitamin A Vitamin C Vitamin D Vitamin B What is the function of 'Enterokinase' in the digestive system? Conversion of Trypsinogen into Trypsin Conversion of Pepsinogen into Pepsin Emulsification of fats Absorption of amino acids Blood plasma without the clotting factors is known as: Serum Lymph Interstitital fluid Formed elements Which hormone acts antagonistically to Insulin by promoting glycogenolysis and gluconeogenesis in the liver? Glucagon Thyroxine Aldosterone Calcitonin Which type of joint is found between the carpal and metacarpal of the human thumb? Saddle joint Gliding joint Hinge joint Ball and socket joint Approximately what percentage of carbon dioxide ( CO 2 ) is transported by the blood in the form of bicarbonate ions ( HCO 3 - )? 70% 20-25% 7% 97% In a healthy human adult, the primary site for erythropoiesis (formation of red blood cells) is the: Red bone marrow Liver Spleen Yellow bone marrow Which hormone is responsible for the 'Flight or Fight' response, increasing alertness and pupillary dilation? Epinephrine Melatonin Thyroxine Gastrin The 'Inspiratory Capacity' (IC) of a human lung is the total volume of air a person can inspire after a normal expiration. It is calculated as: TV + IRV TV + ERV ERV + RV IRV + ERV + TV Which cells of the gastric mucosa are responsible for the secretion of Hydrochloric Acid ( HCl )? Oxyntic cells Peptic cells Chief cells Zymogen cells Which of the following represents the correct sequence of the three main layers of the wall of the human eye from the outermost to the innermost? Sclera, Choroid, Retina Retina, Choroid, Sclera Choroid, Sclera, Retina Sclera, Retina, Choroid A person with which blood group is considered a 'Universal Recipient' because their plasma lacks both Anti-A and Anti-B antibodies? AB positive O negative AB negative O positive Which of the following functions is performed by the Eustachian tube in the human ear? Equalizing air pressure on either side of the eardrum Transmitting sound vibrations to the incus Maintaining the dynamic equilibrium of the body Secreting wax to protect the ear canal The Renal Threshold for glucose in humans, beyond which glycosuria occurs, is approximately: 180 ,mg/dL 100 ,mg/dL 300 ,mg/dL 80 ,mg/dL The gliding joint between the carpals is a type of: Synovial joint Fibrous joint Cartilaginous joint Fixed joint Antennal glands or 'Green glands' are the excretory structures found in which of the following? Prawns Insects (Cockroaches) Earthworms Flatworms The reabsorption of water in the 'Collecting Duct' is regulated by which hormone to produce concentrated urine? Anti-Diuretic Hormone (ADH) Oxytocin Renin Atrial Natriuretic Factor Steroid hormones like cortisol and testosterone are derived from which precursor molecule? Cholesterol Amino acids Fatty acids Peptides Which hormone acts as an antagonist to the Parathyroid Hormone (PTH) regarding blood calcium levels? Thyrocalcitonin Thyroxine Aldosterone Cortisol Which of the following pairs of leucocytes are categorized as the primary phagocytic cells in human blood? Neutrophils and Monocytes Basophils and Eosinophils Lymphocytes and Monocytes Neutrophils and Lymphocytes Passage cells are thin walled cells found in phloem elements that serve as entry points for substance for transport to other plant parts testa of seeds to enable emergence of growing embryonic axis during seed germination central region of style through which the pollen tube grows towards the ovary endodermis of roots facilitating rapid transport of water from cortex to pericycle. In barley stem vascular bundles are - Closed and radial Open and scattered Closed and scattered Open and in a ring Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of : Hydrophytes Xerophytes Mesophytes Epiphytes Stomata in grass leaf are Rectangular Kidney shaped Dumb-bell shaped Barrel shaped Which hormone is 'Hyperglycemic' in nature, meaning it increases blood glucose levels by stimulating glycogenolysis and gluconeogenesis? Glucagon Insulin Aldosterone Calcitonin Casparian strips occur in Cortex Pericycle Epidermis Endodermis Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following Tyloses in vessels Closure of stomata Flaccidity of bulliform cells Shrinkage of air spaces in spongy mesophyll Bulliform cells are responsible for Inward curling of leaves in monocots. Protecting the plant from salt stress. Increased photosynthesis in monocots. Providing large spaces for storage of sugars. Find the statement that is NOT correct with regard to the structure of monocot stem. Phloem parenchyma is absent. Hypodermis is parenchymatous. Vascular bundles are scattered. Vascular bundles are conjoint and closed. The main function of bulliform cells in grasses is : to perform photosynthesis. to minimize water loss during water stress. to make the leaf impermeable to fungal spores. to transport water. In a typical dicotyledonous stem, the large, central, parenchymatous region with intercellular spaces is the: Pith Pericycle Endodermis Cortex In a longitudinal section of a root, starting from the tip and moving upwards, the correct order of zones is: Root cap, Cell division, Cell elongation, Cell maturation Root cap, Cell elongation, Cell division, Cell maturation Cell division, Root cap, Cell elongation, Cell maturation Cell maturation, Cell elongation, Cell division, Root cap Which of the following is a characteristic feature of the anatomy of a monocotyledonous root? Pith is large and well developed Vascular bundles are fewer than six Secondary growth occurs Presence of a distinct cambium The presence of which of the following features distinguishes a dicot stem from a monocot stem? Ring arrangement of vascular bundles Presence of vascular bundles Presence of pith Presence of epidermis When the protoxylem lies towards the periphery and metaxylem lies towards the centre, the arrangement is called: Exarch Endarch Centripetal Mesarch Lymphoid tissues located in the mucosa of the small intestine (specifically the ileum) are known as: Peyer's patches Tonsils Lacteals Crypts of Lieberkuhn Vascular bundles in a monocotyledonous stem are: Conjoint, closed, and scattered Conjoint, open, and in a ring Radial and closed Conjoint, closed, and in a ring Which of the following layers in a dicot root gives rise to lateral roots? Pericycle Endodermis Cortex Epidermis In a monocotyledonous stem, the hypodermis is generally composed of: Sclerenchyma Collenchyma Parenchyma Chlorenchyma The endodermis of a dicot stem is often referred to as the 'starch sheath' because: Its cells are rich in starch grains It produces starch for the plant It stores starch in the form of tubers It is the only site of photosynthesis in the stem Certain endodermal cells in the root, located opposite to the protoxylem points, lack Casparian strips. These are called: Passage cells Bulliform cells Companion cells Lenticels Vascular bundles that have both xylem and phloem located on the same radius, but lack a cambium between them, are described as: Conjoint, collateral, and closed Conjoint, collateral, and open Radial and closed Bicollateral and open In the roots of flowering plants, the protoxylem lies towards the periphery and the metaxylem lies towards the center. This arrangement is known as: Exarch Endarch Centripetal Centrifugal In a monocotyledonous stem, each vascular bundle is surrounded by a: Sclerenchymatous bundle sheath Parenchymatous bundle sheath Starch sheath Casparian strip Unlike the dicotyledonous root, the pith in a monocotyledonous root is: Large and well developed Small or inconspicuous Absent Completely lignified The interfascicular cambium in a dicot stem is formed by the cells of: Medullary rays Pericycle Endodermis Cortex What percentage of oxygen ( O 2 ) is typically transported in a dissolved state through the plasma under normal physiological conditions? 3% 97% 20-25% 7% In an isobilateral (monocot) leaf, the mesophyll is: Not differentiated into palisade and spongy parenchyma Differentiated into palisade and spongy parenchyma Composed entirely of sclerenchyma Absent near the vascular bundles The 'pericycle' in a dicot stem is located between the: Endodermis and Phloem Epidermis and Cortex Xylem and Phloem Pith and Xylem A monocotyledonous root is distinguished from a dicotyledonous root by the presence of: More than six xylem bundles (Polyarch) Two to four xylem bundles Secondary growth via vascular cambium An inconspicuous pith In a dorsiventral leaf, the palisade parenchyma is located towards the: Adaxial epidermis Abaxial epidermis Vascular bundles Lower epidermis Vascular bundles in a monocotyledonous stem are described as: Scattered and conjoint closed Arranged in a ring and conjoint open Radial and open Scattered and conjoint open Leaves that possess stomata on both the upper (adaxial) and lower (abaxial) surfaces, typically found in monocots, are called: Amphistomatic Hypostomatic Epistomatic Astomatic In a dicotyledonous root, the number of xylem and phloem patches is usually: 2 to 4 More than 6 Only 1 8 to 10 Which of the following is NOT a characteristic of the vascular bundles in a dicotyledonous stem? Scattered throughout the ground tissue Arranged in a ring Conjoint and open Endarch protoxylem In the leaf of a C4 plant (like Maize), the large cells around the vascular bundles are called: Bundle sheath cells Spongy parenchyma Palisade cells Bulliform cells The presence of 'Kranz anatomy' is a structural adaptation primarily found in: Monocot leaves Dicot leaves Gymnosperm needles Dicot stems The Sino-atrial Node (SAN), which acts as the natural pacemaker of the heart, is located in which specific region? Upper right corner of the right atrium Lower left corner of the right atrium Lower left corner of the left atrium Upper right corner of the left atrium Which of the following anatomical features is characteristic of a 'dicot leaf'? Differentiation of mesophyll into palisade and spongy parenchyma Isobilateral structure Presence of bulliform cells Parallel venation The meristematic tissue present between the primary xylem and primary phloem in a vascular bundle is the: Intrafascicular cambium Interfascicular cambium Cork cambium Phellogen Vascular bundles in a dicot stem are typically: Conjoint, open, and with endarch protoxylem Conjoint, closed, and with exarch protoxylem Radial, open, and with endarch protoxylem Conjoint, closed, and with endarch protoxylem During secondary growth in dicot roots, the vascular cambium originates from: Tissue located below phloem and portions of pericycle tissue Phellogen only Intrafascicular cambium only Cortex cells only In the vascular bundles of a monocotyledonous stem, water-containing cavities are produced by the dissolution of: Protoxylem elements Metaxylem elements Phloem parenchyma Sieve tubes While most monocotyledons exhibit parallel venation, which of the following monocot plants is an exception and shows reticulate venation? Smilax Grass Maize Banana Tracheids differ from other tracheary elements (vessels) in that they: Lack perforations in their end walls Are living cells Are involved in the transport of organic food Lack lignified cell walls In a dicotyledonous root, the vascular cambium originates from: Tissue located just below the phloem bundles and a portion of pericycle tissue above the protoxylem The endodermis and pericycle The cortex and pith Intrafascicular and interfascicular cambium The region in the root apical meristem where the cells divide very slowly and have low amounts of DNA and RNA is the: Quiescent center Zone of elongation Root cap Zone of maturation In a dicotyledonous root, the vascular cambium originates from: The pericycle and tissue below the phloem The cortex and endodermis The epidermis and pith The medullary rays alone The 'Ornithine Cycle' (Urea cycle) occurs in which organ to convert toxic ammonia into urea? Liver Kidney Spleen Pancreas Root hairs, which absorb water and minerals from the soil, develop from the cells of: Zone of maturation Zone of elongation Meristematic zone Root cap The vascular cambium normally gives rise to: Secondary xylem Primary phloem Phelloderm Phellem Which type of meristem occurs between mature tissues and helps in regenerating parts removed by grazing herbivores in grasses? Intercalary meristem Apical meristem Lateral meristem Secondary meristem The meristem that occurs in the mature regions of roots and shoots of many plants, particularly those that produce woody axis, and appears later than primary meristem is called: Secondary meristem Apical meristem Intercalary meristem Primary meristem In a dorsiventral leaf, the mesophyll is differentiated into: Palisade parenchyma and spongy parenchyma Endodermis and pericycle Xylem and phloem Abaxial and adaxial epidermis Casparian strips occur in: Endodermis Exodermis Pericycle Epidermis In which region of the root do the cells have very thin walls, dense protoplasm, and divide repeatedly? Region of meristematic activity Region of elongation Region of maturation Root cap The Casparian strips, which are impermeable to water, are chemically composed of a waxy material called: Suberin Lignin Pectin Cellulose Which component of the xylem is the only living tissue among the four primary xylem elements? Xylem parenchyma Tracheids Vessels Xylem fibres The cells of which region in the root are responsible for the growth of the root in length? Region of elongation Region of maturation Region of meristematic activity Root cap