Important MCQs on Plant Hormones

Crack NEET 2025 with These Important MCQs on Plant Hormones

NEET Exam is conducted every year and thousands of students across the country appear in it to gain admission to reputed medical colleges. This is the reason Biology remains the most crucial subject in cracking this exam. Furthermore, the topic of plant hormones has been seen to be extremely vital to NEET over the years

With NEET 2025 around the corner; the search volume for ‘plant hormones questions and answers’ has increased significantly. This concise article on MCQs on plant hormones will ensure you know the most vital questions regarding this topic.

All Important MCQs on Plant Hormones

In the following section, the important multiple-choice questions on plant hormones have been compiled. 

1. Leaves fall due to 

1. A decrease in Abscisic acid.

2. An increase in Auxin levels.

3. A shortage of Auxin level. (Answer)

4. An increase in Gibberellin.

2. What type of movement is shown by bulliform cells inside grass leaves?

1. Turgor (Answer)

2. Growth

3. Nastic

4. Tropic

3. Epinasty is defined as the 

1. Nastic movement in which a plant part is bent outward or downward. (Answer)

2. Upward bending of plant parts, due to increased growth in their lower surfaces.

3. Movement of plant parts in a particular direction.

4. None of the above.

4. Which of the following hormones induces a triple response in plant bodies?

1. GA3

2. C2H4 (Answer)

3. IAA

4. ABA

5. Due to the presence of _______, cell division is hugely promoted by coconut milk.

1. Auxin

2. Gibberellin

3. Cytokinin (Answer)

4. Ethylene

6. Which of the following is the reason why Venus Flytraps can capture insects?

1. Presence of specialised muscle-like reflex cells.

2. A rapid change in turgor pressure. (Answer)

3. The prey stimulates chemically.

4. Involuntary process, without the involvement of a plant.

7. If a plant is kept inside a room with continuous red light exposure, what will be the effect of it on its phytochrome?

1. A balance between destruction and synthesis levels. (Answer)

2. An increase in synthesis levels.

3. A decrease in synthesis levels.

4. Complete destruction of phytochrome.

8. An infusion of 2,4-Dichlorophenoxyacetic (2,4-D) acid causes _____ in plant bodies. 

1. Senescence delay. 

2. Increase in the branch sizes, without affecting other parts.

3. Increased growth throughout every part. (Answer)

4. Bolting

9. Statement 1 - Apical dominance is promoted via auxins by suppression in the growth of lateral buds.

            Statement 2 - Shoot tips are periodically pruned to make mulberry plants bushier. 

1. Both statements are correct, with Statement 2 being the reason for Statement 1. (Answer)

2. Only Statement 1 is correct. 

3. Only Statement 2 is correct. 

4. Both statements are wrong.

10. To break dormancy, seeds are often treated at low temperatures and under moist conditions. What is this process called?

1. Chelation

2. Scarification

3. Stratification (Answer)

4. Vernalisation

11. ______ is used for separating and identifying phytohormones. 

1. Gas Chromatography (Answer)

2. Polarising Microscopy

3. Cell Fractionation

4. Autoradiography

12. Some plants secrete pheromones for one of the following reasons. Which one of is it?

1. All plants secrete them for growth and development. 

2. Secreted by yeast cells for mating.

3. Secreted by fungi cells for reproduction.

4. Secreted by rhizopus for zygospore formation. (Answer)

13. Photoperiodism is a technique by which plants use seasonal changes to control flowering. Which of the following hormones assists in this process?

1. Gibberellins

2. Auxins

3. Florigens (Answer)

4. Cytokinins

14. Which plant part is known for its highest concentration of auxins?

1. At the base of plant organs.

2. Xylem and Phloem.

3. Growing tips.

4. Shoots and roots.

15. The condition of ‘Climacteric’ is defined by 

1. A phenomenon related to the ripening of fruits. (Answer)

2. A phenomenon when most of the fruits are ripened in a plant.

3. A phenomenon when a plant exhibits yellowing of its leaves.

4. None of the above.

16. Darkness leads to yellowing even to the healthiest of plants. What is this event called?

1. Chlorosis

2. Phototropism

3. Dormancy

4. Etiolation (Answer)

17. A particular plant acid promotes malting in breweries. Which one of them is it?

1. Gibberellic Acid (Answer)

2. Kinetin

3. Ethylene

4. Auxin

18. Scientists use an auxanometer for ______.

1. Calculating the rate of respiration.

2. Calculating the rate of photosynthesis.

3. Calculating the rate of growth. (Answer)

4. Calculating the rate of transpiration.

19. Which one of the following incidents is the example of positive geotropism?

1. Lateral growth of roots.

2. Downward growth of roots. (Answer)

3. Drooping of leaves.

4. Closing of flowers.

20. Flowers like Oxalis open in the morning and close in the evening. What is this phenomenon called?

1. Photonasty (Answer) 

2. Nyctinasty

3. Phototaxis

4. Phototropism

21. Which of the following phenomenon shortens vegetative period and fastens flowering?

1. Parthenocarpy

2. Vernalisation (Answer)

3. Etiolation

4. Photoperiodism

22. Induction of ethylene causes a particular reaction in growth hormones. Choose the right option. 

1. A decrease in femaleness.

2. Increase in fruit ripening. (Answer)

3. Increase in cell elongation.

4. A decrease in flower abscission.

23. Coleoptile is the phenomenon due to which stems and shoots of plants bend towards a source of light. This is due to - 

1. Availability of the necessary amount of warmth to tips.

2. Greater light availability.

3. More auxin on the shaded side. (Answer)

4. Greater oxygen availability.

Now that all multiple choice questions on plant hormones have been covered, take note of this table which elaborates topic related question weightage.

NEET Marks Weightage

Ace NEET 2025, it is Yours for the Taking

NEET 2025 has been scheduled to 5th May. Since plant physiology and organisation is an important topic in Biology, expect a plethora of questions from this section. Consequently, our important MCQs on plant hormones should turn out to be a saviour. Here, we have tried to cover every necessary plant hormones questions and answers which are vital for NEET. 

Start with the most important topics first. Follow a well-prepared routine and keep yourself fed and hydrated, and we believe you can crack NEET 2025 with ease.