Free NEET Biology multiple-choice questions on Plant Growth and Development. Attempt each question and reveal the answer with a full explanation.
The ability of the Venus Flytrap to capture insects is due to - Rapid turgor pressure changes A passive process requiring no special ability on the part of the plant Specialized "muscle-like" cells Chemical stimulation by the prey A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them? Mutated Embolised Etiolated Defoliated Which one of the following growth regulators is known as stress hormone ? Abscissic acid Ethylene GA3 Indole acetic acid The Avena curvature is used for bioassay of : ABA GA 3 IAA Ethylene Growth hormone Auxin was isolated by F.W. Went from tips of seedling coleoptile of Rice Maize Wheat Oat What is the site of perception of photoperiod necessary for induction of flowering in plants? Leaves Lateral buds Pulvinus Shoot apex It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield? Cytokinin and Abscisic acid Auxin and Ethylene Gibberellin and Cytokinin Gibberellin and Abscisic acid Which of the following is not an inhibitory substance governing seed dormancy? Abscisic acid Phenolic acid Para-ascorbic acid Gibberellic acid Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop. Gibberellin Ethylene Abscisic acid Cytokinin The process of growth is maximum during Lag phase Senescence Dormancy Log phase The site of perception of light in plants during photoperiodism is Stem Axillary bud Leaf Shoot apex Parthenocarpic tomato fruits can be produced by- Removing androecium of flowers before pollen grains are released Treating the plants with low concentrations of gibberellic acid and auxins Raising the plants from vernalized seeds Treating the plants with phenylmercuric acetate The plant hormone used to destroy weeds in a field NAA 2, 4-D IBA IAA Plants follow different pathways in response to environment or phases of life to form different kinds of structures. This ability is called Flexibility Plasticity Maturity Elasticity The gaseous plant growth regulator is used in plants to : promote root growth and roothair formation to increase the absorption surface help overcome apical dominance kill dicotyledonous weeds in the fields speed up the malting process Which one of the following plants does not show plasticity? Coriander Buttercup Maize Cotton Production of Cucumber has increased manifold in recent years. Application of which of the following phytohormones has resulted in this increased yield as the hormone is known to produce female flowers in the plants : Gibberellin Ethylene Cytokinin ABA Which hormone promotes internode/petiole elongation in deep water rice? GA 3 Kinetin Ethylene 2, 4-D In tissue culture experiments, leaf mesophyll cells are put in a culture medium to form callus. This phenomenon may be called as Differentiation Dedifferentiation Development Senescence Spraying of which of the following phytohormone on juvenile conifers helps hastening the maturity period, that leads early seed production? Indole-3-butyric Acid Gibberellic Acid Zeatin Abscisic Acid Formation of interfascicular cambium from fully developed parenchyma cells is an example for Differentiation Redifferentiation Dedifferentiation Maturation Spraying sugarcane crop with which of the following plant growth regulators, increases the length of stem, thus, increasing the yield? Auxin Gibberellin Cytokinin Abscisic acid How does pruning help in making the hedge dense ? It induces the differentiation of new shoots from the rootstock It frees axillary buds from apical dominance The apical shoot grows faster after pruning It released wound hormones Which one of the following phytohormones promotes nutrient mobilization which helps in the delay of leaf senescence in plants? Cytokinin Ethylene Abscisic acid Gibberellin Match List-I with List-II array llll ; & List-I (Growth Regulator) & ; & List-II (Function/Effect) A. & 2,4-D & I. & Brewing industry B. & GA3 & II. & Stimulation of stomatal closure C. & Kinetin & III. & Herbicide D. & ABA & IV. & Nutrient mobilisation array Choose the correct answer from the options given below : A-I, B-II, C-IV, D-III A-I, B-IV, C-III, D-II A-IV, B-III, C-II, D-I A-III, B-I, C-IV, D-II Which one of the following is not a characteristic of plant cells in the phase of elongation? New cell wall deposition Cell enlargement Large conspicuous nuclei Increased vacuolation Heterophyllous development in response to environment is an example of which of the following phenomena? Redifferentiation Dedifferentiation Elasticity Plasticity Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield ? Frequent irrigation of the crop Treatment of the plants with cytokinins alongwith a small dose of nitrogenous fertilizer Removal of all yellow leaves and spraying the remaining green leaves with 2,4,5-trichlorophenoxy acetic acid Application of iron and magnesium to promote synthesis of chlorophyll Opening of floral buds into flowers, is a type of autonomic movement of variation paratonic movement of growth autonomic movement of growth autonomic movement of locomotion. Which one of the following pairs, is not correctly matched? Gibberellic acid - Leaf fall Cytokinin - Cell wall elongation IAA - Cell wall elongation Abscissic acid - Stomatal closure. The wavelength of light absorbed by Pr form of phytochrome is 680 nm 720 nm 620 nm 640 nm Dr. F. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment ? It made possible the isolation and exact identification of auxin. It is the basis for quantitative determination of small amounts of growth-promoting substances. It supports the hypothesis that IAA is auxin. It demonstrated polar movement of auxins. Match Column-I with Column-II and array ll Column-I & Column-II (1) Cytokinin & (i) stimulates closure of stomata (2) Ethylene & (ii) increases stem length (3) Gibberellin & (iii) promotes lateral shoot growth (4) Abscisic acid & (iv) found in large amount in tissues undergoing senescence array select the correct option using codes given below. (iii) (iv) (ii) (i) (iii) (ii) (iv) (i) (iv) (i) (iii) (ii) (ii) (iv) (i) (iii) Treatment of seed at low temperature under moist conditions to break its dormancy is called - Sclarification Vernalization Chelation Stratification Auxin is used by gardeners to prepare weed-free lawns. But no damage is caused to grass as auxin promotes apical dominance. promotes abscission of mature leaves only. does not affect mature monocotyledonous plants. can help in cell division in grasses, to produce growth. Read the following statements on plant growth and development. (A) Parthenocarpy can be induced by auxins. (B) Plant growth regulators can be involved in promotion as well as inhibition of growth. (C) Dedifferentiation is a pre-requisite for re-differentiation. (D) Abscisic acid is a plant growth promoter. (E) Apical dominance promotes the growth of lateral buds. Choose the option with all correct statements. B, D, E only A, B, C only A, C, E only A, D, E only Which of the following plant growth regulators is used as a herbicide? 2, 4-D Kinetin Abscisic acid Gibberellin Which of the following plant growth regulators promotes internode elongation prior to flowering in cabbage? Abscisic acid Gibberellin Indole butyric acid Ethephon Length of the stem at time 0 is 20 cm. The arithmetic growth rate is 30 cm per day. What is the length of the stem at the end of the 7th day? 50 cm 170 cm 230 cm 460 cm An enzyme that can stimulate germination of barley seeds is- (1) α- amylase (2) Lipase (3) Protease (4) Invertase “Foolish seedling” disease of rice led to the discovery of ABA 2,4-D IAA GA One of the synthetic auxin is : IBA NAA IAA GA Which one of the following acids is a derivative of carotenoids ? Abscisic acid Indole butyric acid Indole-3-acetic acid Gibberellic acid During seed germination its stored food is mobilized by Ethylene Cytokinin ABA Gibberellin