Free NEET Biology multiple-choice questions on Secondary Growth. Attempt each question and reveal the answer with a full explanation.
Interfascicular cambium develops from the cells of Medullary rays Xylem parenchyma Endodermis Pericycle During secondary growth, the phellogen (cork cambium) cuts off cells on the inner side that differentiate into: Secondary cortex (Phelloderm) Cork (Phellem) Secondary phloem Periderm In heartwood, the balloon-like ingrowths of parenchyma cells into the lumen of vessels are called: Tyloses Lenticels Phelloderm Complementary cells During secondary growth, the phellogen cuts off cells on the inner side which differentiate into: Phelloderm Phellem Cork Epidermis Which of the following represents the correct sequence of the three layers of the 'bark' from outside to inside? Phellem, Phellogen, Phelloderm Phelloderm, Phellogen, Phellem Phellogen, Phellem, Phelloderm Phellem, Phelloderm, Phellogen During secondary growth, the phellogen cuts off cells on the inner side that differentiate into a parenchymatous tissue called: Phelloderm Phellem Periderm Rhytidome The loosely arranged, colorless parenchymatous cells formed by the phellogen that rupture the epidermis in lenticels are called: Complementary cells Cork cells Albuminous cells Passage cells Lenticels are lens-shaped openings found in the bark of trees. Their primary function is: Gaseous exchange between internal tissues and atmosphere Water absorption from the atmosphere Photosynthesis in older stems Protection against herbivory Which of the following hormones is a derivative of amino acid tyrosine? Epinephrine Estrogen Insulin Glucagon In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues - Stem and root All parts Shoot tips and root tips Flowers, fruit and leaves For a critical study of secondary growth in plants. which one of the following pairs is suitable? teak and pine deodar and fern wheat and maiden hair fern sugarcane and sunflower. Lenticels are involved in Transpiration Gaseous exchange Food transport Photosynthesis Which of the statements given below is not true about formation of Annual Rings in trees? (1) Annual rings are not prominent in trees of temperate region. (2) Annual ring is a combination of spring wood and autumn wood produced in a year (3) Differential activity of cambium causes light and dark bands of tissue early and late wood respectively. (4) Activity of cambium depends upon variation in climate. Match List-I with List-II. array ll List-I & List-II (a) Lenticels & (i) Phellogen (b) Cork cambium & (ii) Suberin deposition (c) Secondary cortex & (iii) Exchange of gases (d) Cork & (iv) Phelloderm array Choose the correct answer from the options given below. a-iii, b-i, c-iv, d-ii a-ii, b-iii, c-iv, d-i a-iv, b-ii, c-i, d-iii a-iv, b-i, c-iii, d-ii In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to : (a) secretion of secondary metabolites and their deposition in the lumen of vessels. (b) deposition of organic compounds like tannins and resins in the central layers of stem. (c) deposition of suberin and aromatic substances in the outer layer of stem. (d) deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem. (e) presence of parenchyma cells, functionally active xylem elements and essential oils. Choose the correct answer from the options given below: (c) and (d) Only (d) and (e) Only (b) and (d) Only (a) and (b) Only The anatomy of springwood shows some peculiar features. Identify the correct set of statements about springwood. (a) It is also called as the earlywood (b) In spring season cambium produces xylem elements with narrow vessels (c) It is lighter in colour (d) The springwood along with autumnwood shows alternate concentric rings forming annual rings (e) It has lower density Choose the correct answer from the options given below : (a), (c), (d) and (e) Only (a), (b) and (d) Only (c), (d) and (e) Only (a), (b), (d) and (e) Only Identify the correct statements: A. Lenticels are the lens-shaped openings permitting the exchange of gases. B. Bark formed early in the season is called hard bark. C. Bark is a technical term that refers to all tissues exterior to vascular cambium. D. Bark refers to periderm and secondary phloem. E. Phellogen is single-layered in thickness. Choose the correct answer from the options given below: B, C and E only A and D only A, B and D only B and C only Age of a tree can be estimated by Its height and girth Biomass Number of annual rings Diameter of its heartwood Secondary xylem and phloem in dicot stem are produced by Phellogen Vascular cambium Apical meristems Axillary meristems Plants having little or no secondary growth are Conifers Deciduous angiosperms Grasses Cycads Identify the incorrect statement. Sapwood is involved in conduction of water and minerals from root to leaf Sapwood is the innermost secondary xylem and is lighter in colour Due to deposition of tannins, resins, oils etc., heart wood is dark in colour Heart wood does not conduct water but gives mechanical support Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R : Assertion A : Late wood has fewer xylary elements with narrow vessels. Reason R : Cambium is less active in winters. In the light of the above statements, choose the correct answer from the options given below : Both A and R are true and R is the correct explanation of A Both A and R are true but R is NOT the correct explanation of A A is true but R is false A is false but R is true The phellogen cuts off cells on both sides. The outer cells differentiate into cork, while the inner cells differentiate into: Secondary cortex (Phelloderm) Secondary phloem Periderm Phellogen Heartwood is resistant to the attacks of microorganisms and insects primarily due to the deposition of: Tannins, resins, oils, and aromatic substances Suberin and chitin Lignin and cellulose only Pectin and mucilage