1. Which plant hormone is responsible for cell elongation and growth?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Abscisic acid
Answer: a) Auxin
2. Which plant hormone is involved in the promotion of seed germination?
a) Abscisic acid
b) Gibberellin
c) Ethylene
d) Cytokinin
Answer: b) Gibberellin
3. Which plant hormone is known as the “stress hormone” and regulates responses to environmental stress such as drought and salinity?
a) Gibberellin
b) Abscisic acid
c) Ethylene
d) Cytokinin
Answer: b) Abscisic acid
4. The senescence of leaves is regulated by which plant hormone?
a) Gibberellin
b) Auxin
c) Ethylene
d) Cytokinin
Answer: c) Ethylene
5. Which plant hormone is responsible for the promotion of lateral bud growth and inhibition of apical dominance?
a) Auxin
b) Gibberellin
c) Cytokinin
d) Ethylene
Answer: c) Cytokinin
6. Which of the following plant hormones is involved in the closing of stomata during water stress?
a) Gibberellin
b) Auxin
c) Ethylene
d) Abscisic acid
Answer: d) Abscisic acid
7. The triple response in seedlings, characterized by a thickened, shorter stem, is associated with the action of which plant hormone?
a) Gibberellin
b) Auxin
c) Ethylene
d) Cytokinin
Answer: c) Ethylene
8. Which plant hormone is responsible for phototropism and gravitropism in plant shoots?
a) Gibberellin
b) Auxin
c) Cytokinin
d) Abscisic acid
Answer: b) Auxin
9. The breaking of dormancy in seeds is primarily regulated by which plant hormone?
a) Gibberellin
b) Auxin
c) Ethylene
d) Cytokinin
Answer: a) Gibberellin
10. Which plant hormone is involved in the regulation of cell division and differentiation in plant tissues?
a) Gibberellin
b) Auxin
c) Cytokinin
d) Ethylene
Answer: c) Cytokinin
11. Which plant hormone is responsible for promoting cell elongation and cell division?
a) Abscisic Acid (ABA)
b) Gibberellins (GA)
c) Auxins
d) Cytokinins
Answer: c) Auxins
12. Which plant hormone is involved in the regulation of seed dormancy and abscission of leaves and fruits?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Ethylene
d) Cytokinins
Answer: b) Abscisic Acid (ABA)
13. The “triple response” in plants, characterized by a thickening of the stem, slowing of stem elongation, and horizontal growth, is a response to which hormone?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Ethylene
d) Auxins
Answer: c) Ethylene
14. Which plant hormone is primarily responsible for promoting root growth and inhibiting shoot growth?
a) Cytokinins
b) Gibberellins (GA)
c) Abscisic Acid (ABA)
d) Auxins
Answer: d) Auxins
15. The breaking of seed dormancy and promotion of germination are functions associated with which plant hormone?
a) Ethylene
b) Cytokinins
c) Gibberellins (GA)
d) Abscisic Acid (ABA)
Answer: c) Gibberellins (GA)
16. Which plant hormone is commonly known as the “stress hormone” and is involved in responses to environmental stresses such as drought and salinity?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Auxins
d) Ethylene
Answer: b) Abscisic Acid (ABA)
17. What is the primary function of cytokinins in plants?
a) Inhibition of root growth
b) Promotion of leaf abscission
c) Promotion of cell division
d) Inhibition of seed germination
Answer: c) Promotion of cell division
18. Which plant hormone is responsible for the opening and closing of stomata in leaves?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Auxins
d) Ethylene
Answer: b) Abscisic Acid (ABA)
19. In which plant organ is ethylene primarily produced?
a) Roots
b) Leaves
c) Flowers
d) Fruits
Answer: d) Fruits
20. What is the role of gibberellins in plant growth and development?
a) Inhibition of seed germination
b) Promotion of stem elongation
c) Promotion of leaf abscission
d) Inhibition of flowering
Answer: b) Promotion of stem elongation
21. Question: Which plant hormone is involved in the promotion of fruit ripening and senescence in plants?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Auxins
d) Ethylene
Answer: d) Ethylene
22. Question: What is the primary role of auxins in phototropism?
a) Inhibition of stem elongation
b) Promotion of root growth
c) Promotion of stem elongation on the shaded side
d) Inhibition of leaf expansion
Answer: c) Promotion of stem elongation on the shaded side
23. Question: Which plant hormone is responsible for the prevention of premature leaf senescence and promotes chlorophyll retention?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Cytokinins
d) Auxins
Answer: c) Cytokinins
24. Question: The process of apical dominance is primarily regulated by which plant hormone?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Auxins
d) Ethylene
Answer: c) Auxins
25. Question: Which plant hormone is responsible for promoting the elongation of cells in the shoot apex, leading to cell division and differentiation?
a) Gibberellins (GA)
b) Abscisic Acid (ABA)
c) Auxins
d) Ethylene
Answer: a) Gibberellins (GA)