Examine the effects of Ethylene on peanut seed germination and potato tuber sprouting:
(i) Ethylene breaks seed and bud dormancy. (ii) Ethylene initiates germination in peanut seeds. (iii) Ethylene promotes sprouting of potato tubers. (iv) Ethylene enforces strict dormancy in peanut seeds and potato tubers.
Statements (i), (ii), and (iii) are correct regarding ethylene breaking dormancy and initiating peanut germination and potato sprouting. Statement (iv) is incorrect.
Question 92 of 100
📘 CLASS XI
Consider the application of Ethylene and Ethephon in fruit ripening and thinning:
(i) Ethylene enhances respiration rate during ripening (respiratory climactic). (ii) Ethephon in aqueous solution releases ethylene slowly. (iii) Ethephon hastens fruit ripening in tomatoes and apples. (iv) Ethephon accelerates fruit thinning in cotton, cherry, and walnut.
All four statements (i), (ii), (iii), and (iv) are true statements detailing respiratory climactic, ethephon release, fruit ripening, and fruit thinning.
Question 93 of 100
📘 CLASS XI
Analyze the role of ABA in seed development, maturation, and desiccation resistance:
(i) ABA plays an important role in seed development and maturation. (ii) ABA induces seed dormancy. (iii) Dormancy induced by ABA helps seeds withstand desiccation. (iv) ABA helps seeds withstand environmental conditions unfavourable for growth.
All four statements (i), (ii), (iii), and (iv) are completely correct regarding ABA functions in seed maturation, dormancy, and desiccation resistance.
Question 94 of 100
📘 CLASS XI
Examine the open nature of growth and differentiation in plant meristems:
(i) Meristems continuously add new cells to the plant body (open growth). (ii) Cells arising from the same meristem differentiate into different structures based on location (open differentiation). (iii) Cells positioned at the root apex peripheral zone differentiate into epidermis. (iv) Cells pushed away from root apical meristem tip differentiate into root cap cells.
All four statements (i), (ii), (iii), and (iv) are correct descriptions of open growth, open differentiation, and position-dependent development of root cap vs epidermis.
Question 95 of 100
📘 CLASS XI
Which of the following environmental factors are recognized extrinsic regulators of plant growth?
(i) Light. (ii) Temperature. (iii) Water and Oxygen. (iv) Nutrition.
All four statements (i: Light, ii: Temperature, iii: Water/Oxygen, iv: Nutrition) are explicitly listed as extrinsic factors controlling growth and development.
Question 96 of 100
📘 CLASS XI
Consider the mathematical formula for exponential geometric growth W1 = W0ert:
(i) W1 = final size (weight, height, cell number). (ii) W0 = initial size at the beginning of the period. (iii) r = growth rate (relative growth rate / efficiency index). (iv) t = time of growth, and e = base of natural logarithms.
All four statements (i), (ii), (iii), and (iv) accurately define every term in the exponential geometric growth equation W1 = W0ert.
Question 97 of 100
📘 CLASS XI
Evaluate the cellular events occurring during the meristematic phase vs elongation phase:
(i) Meristematic cells have abundant plasmodesmatal connections. (ii) Meristematic cells have thin primary cellulosic walls. (iii) Elongation cells show cell enlargement and new cell wall deposition. (iv) Elongation cells show increased vacuolation.
All four statements (i), (ii), (iii), and (iv) are completely correct descriptions of meristematic and elongation phase cellular features.
Question 98 of 100
📘 CLASS XI
Analyze the functions of Auxin vs Cytokinins in lateral bud development:
(i) Auxin synthesized at shoot apex inhibits growth of lateral buds (apical dominance). (ii) Cytokinin synthesized in roots promotes lateral shoot growth and overcomes apical dominance. (iii) Decapitation removes the source of auxin, enabling lateral buds to grow. (iv) Application of exogenous cytokinin to lateral buds stimulates their growth even with intact apical bud.
All four statements (i), (ii), (iii), and (iv) accurately explain the antagonistic actions of auxin and cytokinin in apical dominance and lateral bud development.
Question 99 of 100
📘 CLASS XI
Regarding the discovery of Gibberellins from Gibberella fujikuroi, consider:
(i) Bakanae disease causes uninfected dwarfism in rice seedlings. (ii) Rice seedlings infected with Gibberella fujikuroi grew excessively tall. (iii) Sterile filtrates of the fungus induced bakanae symptoms in healthy seedlings. (iv) Active substance identified was gibberellic acid.
Statements (ii), (iii), and (iv) are correct because bakanae disease causes excessive tall growth in rice seedlings due to fungal gibberellic acid. Statement (i) is incorrect because bakanae causes excessive height/elongation, not dwarfism.
Question 100 of 100
📘 CLASS XI
Analyze the overall integrated control of plant growth and development:
(i) Intrinsic intracellular control is genetic. (ii) Intrinsic intercellular control is chemical (plant growth regulators). (iii) Extrinsic factors include light, temperature, water, oxygen, and nutrients. (iv) Plant growth and development result from the interplay of genomic, PGR, and extrinsic factors.
All four statements (i), (ii), (iii), and (iv) represent a comprehensive summary of intrinsic genetic/PGR and extrinsic environmental controls governing plant growth and development.
