1. The importance of day length in the flowering of plants was first shown in…?
a. Cotton
b. Lemna
c. Petunia
d. Tobacco
Answer: d. Tobacco
2. Cell elongation in the intertidal region of the green plant takes place due to…?
a. Insole acetic acid
b. Cytokinins
c. Gibberellins
d. Ethylene
Answer: c. Gibberellins
3. Which of the following is the cause of seed dormancy?
a. Naphthalene acetic acid (NAA)
b. Abscisic acid (ABA)
c. Indoleacetic acid (IAA)
d. Indolebutyric acid (IBA)
Answer: b. Abscisic acid (ABA)
4. Which of the following acid prevents the fall of fruits?
a. Naphthalene acetic acid (NAA)
b. Abscisic acid (ABA)
c. Indoleacetic acid (IAA)
d. Indolebutyric acid (IBA)
Answer: a. Naphthalene acetic acid (NAA)
5. Ethylene is a group of plant growth regulators which are widely used for…?
a. Regarding ripening of tomatoes
b. Hastening of ripening of fruits
c. Slowing down ripening of fruit
d. None of these
Answer: b. Hastening of ripening of fruits
6. The ability of a plant to adapt to and survive with changes in its environment is known as…?
a. Plant elasticity
b. Plant plasticity
c. Evolution
d. Plant flexibility
Answer: b. Plant plasticity
7. Choose the correct statement about Monocarpic plants:
a. Bear flowers with one ovary
b. Bear only one flower
c. Flower once and die
d. Flowers and fruits many times
Answer: c. Flower once and die
8. The photoperiod in plants is perceived at…?
a. Meristem
b. Flower
c. Floral buds
d. Leaves
Answer: d. Leaves
Recommended: Plant Growth and Development Practice Test
9. Which type of typical growth curve is commonly observed in plants?
a. Stair-steps shaped
b. Parabolic
c. Sigmoid
d. Linear
Answer: c. Sigmoid
10. Which one of the following generally acts as an antagonist to Gibberellins?
a. Naphthalene acetic acid (NAA)
b. Abscisic acid (ABA)
c. Indoleacetic acid (IAA)
d. Indolebutyric acid (IBA)
Answer: b. Abscisic acid (ABA)
11. Which of the following acid is applied as a plant growth hormone in tea plantations?
a. Ethylene
b. Abscisic acid
c. Zeatin
d. Indole-3-ascetic acid
Answer: d. Indole-3-ascetic acid
12. Which hormone is responsible for the root development?
a. Abscisic acid
b. Auxin
c. Gibberellins
d. Ethylene
Answer: b. Auxin
13. Which of the following is a synthetic auxin?
a. Naphthalene acetic acid (NAA)
b. Abscisic acid (ABA)
c. Indoleacetic acid (IAA)
d. Indolebutyric acid (IBA)
Answer: a. Naphthalene acetic acid (NAA)
14. What is the movement of auxin when traveling through the stem of the plant?
a. Centripetal
b. Basipetal
c. Acropetal
d. Linear
Answer: b. Basipetal
15. Which one of the following is not an auxin?
a. Indole-3-acetic acid
b. Malic Hydrazide
c. Indole butyric acid
d. Naphthalene acetic acid
Answer: b. Malic Hydrazide
16. Unequal distribution of auxin in plants may lead to…?
a. Decrease in photosynthesis
b. Increase in respiration
c. Day-neutral curvature
d. Phototrophic curvature
Answer: d. Phototrophic curvature
17. The coiling of garden pea tendrils around any external support is an example of…?
a. Thigmotrophism
b. Gravitropism
c. Thigmotaxis
d. Seismonasty
Answer: a. Thigmotrophism
18. Natural cytokinins are synthesized in tissues for…?
a. Dividing
b. Senescent
c. Differentiating
d. Storing food
Answer: a. Dividing
19. Which of the following is a gaseous hormone, which controls senescence and fruit ripening?
a. Auxin
b. Ethylene
c. Ethane
d. Argon
Answer: b. Ethylene
20. Where is the vascular cambium located in plants?
a. Between the root hair and the meristem
b. Between the xylem and the phloem
c. Between the xylem and the root
d. Between the phloem and the root
Answer: b. Between the xylem and the phloem
21. Which of the following hormone stimulates growth in internodes?
a. Auxin
b. Ethylene
c. Gibberellins
d. Cytokinin
Answer: c. Gibberellins
22. The chemical messengers that are used by multicellular organisms for control and coordination are known as…?
a. Vitamins
b. Hormones
c. Minerals
d. Compounds
Answer: b. Hormones
23. The histogen layer present at the apex of the root tip is known as…?
a. Dermatogen
b. Calyptrogen
c. Procambium
d. Plerome
Answer: b. Calyptrogen
24. What is the location of the root apex, because of the presence of the root cap?
a. Terminal
b. Lateral
c. Sub-terminal
d. Intercalary
Answer: c. Sub-terminal
25. In an experiment a student put one plant in a dark place and the other in a light place. After 5 days, he found that plants in the dark grow taller than plants in the light. What is the name of this phenomenon and which hormone is involved?
a. Epiolation and Abscisic acid
b. Etiolation and Abscisic acid
c. Epiolation and Auxin
d. Etiolation and Auxin
Answer: d. Etiolation and Auxin
