Section A: Response and Sensitivity (1–5)
1. Response in plants is defined as:
A. Growth of roots only
B. Reaction of a plant to a stimulus
C. Movement of water in xylem
D. Photosynthesis
2. Sensitivity (irritability) in plants refers to:
A. Ability to produce flowers
B. Ability to detect and react to changes
C. Seed germination only
D. Photosynthesis efficiency
3. Plants have limited sensitivity mainly related to:
A. Reproduction
B. Nutritional needs
C. Flowering
D. Seed dispersal
4. Which of the following is NOT a stimulus for plant responses?
A. Light
B. Temperature
C. Wind
D. Chemicals
5. Sensitivity in plants is important because it:
A. Enables movement of animals
B. Helps plants respond to environmental changes
C. Increases soil fertility
D. Enhances photosynthesis only
Section B: Tropisms (6–15)
6. Tropism is defined as:
A. Non-directional movement
B. Growth response in a specific direction to a stimulus
C. Shedding of leaves
D. Dormancy
7. Phototropism is:
A. Growth towards water
B. Growth towards light
C. Growth towards chemicals
D. Growth towards gravity
8. Positive phototropism occurs in:
A. Roots
B. Stems
C. Leaves only
D. Flowers only
9. Geotropism in roots is:
A. Negative
B. Positive
C. Neutral
D. None
10. Hydrotropism is the growth response towards:
A. Sunlight
B. Water
C. Chemicals
D. Touch
11. Chemotropism can be observed in:
A. Pollen tube growth
B. Seed germination
C. Leaf folding
D. Flower opening
12. Thigmotropism is the plant’s response to:
A. Water
B. Touch or contact
C. Gravity
D. Light
13. Heliotropism is:
A. Leaves orienting towards sunlight
B. Roots growing downward
C. Plants shedding leaves
D. Rapid leaf folding
14. Which hormone primarily controls tropic responses?
A. Gibberellins
B. Auxins
C. Cytokinins
D. Ethylene
15. What happens to a shoot illuminated from one side?
A. It grows straight
B. It bends towards the light
C. It bends away from light
D. It stops growing
Section C: Nasties (16–22)
16. Nasties are:
A. Directional growth responses
B. Non-directional movements not influenced by stimulus direction
C. Seed dormancy responses
D. Root growth patterns
17. Photonasty refers to a plant’s response to:
A. Chemicals
B. Light intensity
C. Gravity
D. Water
18. Thigmonasty is observed in:
A. Venus flytrap closing
B. Chloroplast movement
C. Root elongation
D. Leaf senescence
19. Chemonasty occurs in response to:
A. Light intensity
B. Chemical/nutrient concentration
C. Gravity
D. Water
20. Hydronasty is a response to:
A. Touch
B. Water/humidity
C. Chemical stimuli
D. Light
21. Example of photonasty is:
A. Mimosa pudica folding
B. Morning glory flowers opening in morning
C. Roots growing downward
D. Pollen tube growth
22. Importance of nasties in plants includes:
A. Enhancing photosynthesis and survival
B. Increasing root length only
C. Preventing seed dispersal
D. Killing pests
Section D: Abscission and Dormancy (23–26)
23. Abscission is:
A. Growth towards water
B. Shedding of leaves, flowers, or fruits
C. Root elongation
D. Stem bending
24. Abscission occurs in response to:
A. Favorable conditions
B. Adverse environmental conditions
C. Light only
D. Water
25. Dormancy in seeds or buds is characterized by:
A. Rapid growth
B. Reduced metabolic activity and halted growth
C. Flower opening
D. Root bending
26. Purpose of dormancy is:
A. Facilitate growth
B. Allow survival under unfavorable conditions
C. Increase photosynthesis
D. Attract pollinators
Section E: Taxes (27–30)
27. Taxic responses are observed in:
A. Multicellular plants
B. Unicellular organisms
C. Roots only
D. Leaves only
28. Phototaxis is:
A. Movement away from water
B. Movement towards light
C. Growth of roots
D. Leaf orientation
29. Chemotaxis occurs when:
A. Gametes move towards chemicals during fertilization
B. Plants bend towards light
C. Leaves fold in response to touch
D. Flowers open in morning
30. Taxes can be:
A. Positive or negative
B. Only positive
C. Only negative
D. Non-directional
Section F: Plant Hormones – Auxins (31–35)
31. Auxins are primarily produced in:
A. Roots only
B. Shoot and root tips
C. Leaves only
D. Flowers only
32. Auxins promote:
A. Seed dormancy only
B. Cell elongation and division
C. Leaf shedding only
D. Photosynthesis
33. Effect of auxins on roots at high concentrations is:
A. Stimulates growth
B. Inhibits growth
C. No effect
D. Promotes flowering
34. Synthetic auxins are used as:
A. Fertilizers
B. Weed killers
C. Pesticides
D. Growth inhibitors
35. Apical dominance is maintained by:
A. Cytokinins
B. Auxins
C. Ethylene
D. Gibberellins
Section G: Practical and Observational Questions (36–40)
36. In phototropism experiments, why is a clinostat used?
A. To increase light intensity
B. To rotate seedlings so light exposure is uniform
C. To stop growth
D. To water plants
37. Positive geotropism occurs in:
A. Shoots
B. Roots
C. Flowers
D. Leaves
38. Importance of phototropism for plants:
A. Helps roots anchor in soil
B. Ensures shoots grow towards light for photosynthesis
C. Reduces transpiration
D. Promotes abscission
39. Folding of Mimosa pudica leaves when touched is an example of:
A. Thigmotropism
B. Thigmonasty
C. Heliotropism
D. Chemotropism40. Plant responses help:
A. Absorb light, water, and nutrients efficiently
B. Only produce flowers
C. Only grow roots
D. Prevent dormancy
