Title 13. PLANT GROWTH AND.pdf ✅

13. PLANT GROWTH AND DEVELOPMENT 1. Assertion (A): Plants show open form of growth. Reason (R): Plants retain their meristematic activity at certain locations, throughout their life. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A)&(R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 2. Assertion (A): Swelling of piece of wood when placed in water is not a growth. Reason (R): Swelling of piece of wood when placed in water is an imbibition. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 3. Assertion (A): A sigmoid curve is characteristic of plants growing in natural environment. Reason (R): In natural conditions generally food and space start to act as limiting factor. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 4. Assertion (A): Plant growth and development is intimately linked with the water status of plant cell. Reason (R): Water provides the medium for enzymatic activities. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 5. Assertion (A): Environmental signals such as light and gravity also affect certain phases or stages of growth. Reason (R): Gravity and light leads to differential auxin concentration which is responsible for differential growth. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 6. Assertion (A): The act leading to maturation is known as differentiation. Reason (R): Differentiation leads to structural and functional maturation of cells from meristematio cells. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 7. Assertion (A): Secondary xylem and secondary phloem both are redifferentiated tissue. Reason (R): Both of the tissue once again lose the capacity to divide, but mature to perform specific functions. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false
8. Assertion (A): Callus arise from parenchymatous cells under controlled laboratory conditions, is dedifferentiated mas of cells. Reason (R): In callus arise from parenchymatous cells, cells regain ability of further division and lost specific shape and functions. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 9. Assertion (A): Development is a broad and extensive aspect of the life of an organism. Reason (R): Development includes all changes that an organism goes through during it's life cycle from birth of death. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 10. Assertion (A): Growth regulators are intrinsic and intercellular factors which controls development of plant. Reason (R): Growth regulators are produced by plant cell it self and work in cells other than those in which they synthesise. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 11. Assertion (A): Auxins are widely used for plant propagation. Reason (R): Auxins inhibit preharvesting fruit drop. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 12. Assertion (A): By spray of gibberellin market period of fruits can be extended longer. Reason (R): Somehow gibberellins delay senescence. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 13. Assertion (A): Gibberellin application increase sugarcane yield as much as 20 tonnes per acre. Reason (R): Gibberellin leads bolting in sugarcane. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 14. Assertion (A): Kinetin is synthetic cytokinine. Reason (R): Kinetin was obtained from herring sperm DNA. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 15. Assertion (A): Ethlene increases yield of deep water rice. Reason (R): In deep water rice ethylene leads to elongation of either internode or petiole hence plant become able to overcome limiting effect of light.
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 16. Assertion (A): Abscisic acid helps in making of seed as perennation structure. Reason (R): Abscisic acid promotes dormancy so that seed can tolerate desiccation and other factors. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 17. Assertion (A): In day neutral plants there is no correlation between exposure to light duration and flowering response. Reason (R): In Day neutral plant there is no specific requirement of light and dark hours. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 18. Assertion (A): Flowering in plants depends only on a combination of light and dark exposure. Reason (R): Flowering is not dependent on relative duration of light and dark hours. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 19. Assertion (A): Vernalisation prevents precocious reproductive development till the plant matures. Reason (R): Vernalisation leads to reduction in vegetative life of plant. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 20. Assertion (A): Winter varieties off wheat & rye are planted in autumn not in spring. Reason (R): If winter varieties planted in spring normally they fail to flower or produce mature grain within a span of flowering season. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 21. Assertion (A): Growth, at cellular level, is measured by a variety of parameters some of which are: increase in fresh weight, dry weight, length, area, volume and cell number. Reason (R): Growth, at a cellular level, is principally a consequence of increase in the amount of protoplasm and increase in protoplasm is difficult to measure directly. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are false 22. Assertion (A): A sigmoid curve is a characteristic of living organism growing in a natural environment. Reason (R): It is typical for all cells, tissues and organs of a plant. (1) Both (A) & (R) are true and the (R) is the correct explanation of the (A) (2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)