Plant Movement Multiple Choice Questions
1. Twining of tendrils around a support is a good example of
A. chemotropism
B. nastic movements
C. phototropism
D. thigmotropism
Answer: D thigmotropism
2. A plant is said to be etiolated when it has
A. few leaves than normal
B. abnormally long delicate and pale yellow shoot
C. variegated leaves
D. a stunted stem with yellow leaves
Answer: B abnormally long delicate and pale yellow shoot
3. Plasmodia of slime mold are known to show
A. ciliary movement
B. amoeboid movement
C. thigmonasty
D. no movements
Answer: B amoeboid movement
4. An apparatus commonly used to demonstrate phototropism is
A. heliotropic chamber
B. clinostat
C. arc auxanometer
D. photometer
Answer: A heliotropic chamber
5. The movements where organism and its organs move from one place to another in response to external stimuli are called
A. tropic
B. nastic
C. nutational
D. tactic
Answer: D tactic
6. Auxanometer is used to demonstrate
A. movements
B. growth
C. auxin concentration
D. respiration
Answer: B growth
7. Most of the leaves and flower buds open because of differential growth of their surface. This is known as
A. hyponasty
B. epinasty
C. thigmonasty
D. nutation
Answer: B epinasty
8. Which one of the following would be an example of chemotropic movement?
A. movement of moss antherozoid in response to cane sugar secreted by archegonia
B. movement of fern antherozoid in response to malic acid
C. growth of pollen tube on the stigma
D. growth of pollen grain inside the anther
Answer: C growth of pollen tube on the stigma
9. Leaves of clover close during night and open during the day; such a movement is known as
A. nyctinasty
B. thermonasty
C. diurnal variation
D. phototropism
Answer: A nyctinasty
10. Clinostat is employed in the study of
A. osmosis
B. growth movements
C. photosynthesis
D. respiration
Answer: B growth movements
11. Thigmotropism is the response of the plant to
A. gravity
B. water
C. light
D. contact
Answer: D contact
12. The time period between application of stimulus and its visible response is called
A. presentation time
B. relaxation time
C. reaction time
D. stimulation period
Answer: C reaction time
13. Phototropic movements of stem and roots are due to
A. action of gravity
B. action of light
C. differential action of hormones
D. epinasty and hyponasty
Answer: B action of light
14. Closure of lid of pitcher in pitcher plant is
A. a paratonic movement
B. a tropic movement
C. a turgor movement
D. an autonomous movement
Answer: A a paratonic movement
15. Tropic movements are due to
A. cell elongation
B. cell division
C. sudden gain of water
D. sudden gain of light
Answer: C sudden gain of water
16. Leaves of Mimosa pudica droop as soon as they are touched. What type of moment is it?
A. nyctinasty
B. thigmonasty
C. seismonasty
D. hyponasty
Answer: C seismonasty
17. Thigmotropism is best exhibited by
A. root apex
B. tendrils
C. thorns
D. lamina
Answer: B tendrils
18. The most effective wavelength in inducing phototrophic moments is
A. red and far red
B. blue and red
C. blue and violet
D. green and yellow
Answer: C blue and violet
19. Opening of flower in involves
A. epinasty
B. hyponasty
C. mutation
D. phototaxis
Answer: A epinasty
20. The streaming movement of living protoplasm can be best demonstrated in
A. pith cells
B. root tip cells
C. staminal hairs of Tradescantia
D. epidermal peels of onion
Answer: C staminal hairs of Tradescantia
21. Streaming movement of protoplasm in Hydrilla leaves is an example of
A. spontaneous movement
B. induced movement
C. paratonic movement
D. tropic movement
Answer: A spontaneous movement
22. Tertiary roots are
A. orthogeotropic
B. plagiogeotropic
C. diageotropic
D. agegeotropic
Answer: C diageotropic
23. A horizontally placed plant exhibits apogeotropism due to
A. accumulation of auxin on the upper side
B. accumulation of auxin on the lower side
C. cell enlargement on the upper side
D. cell shrinkage on the lower side
Answer: B accumulation of auxin on the lower side
24. Movements caused by internal factors are
A. paratonic
B. autonomic
C. intrinsic
D. rheotropic
Answer: B autonomic
25. Pneumatophores show
A. positive geotropism
B. negative geotropism
C. plageotropism
D. negative phototropism
Answer: B negative geotropism
26. Which of the following plant shows both nyctinasty and thigmonasty?
A. Drosera
B. Cuscuta
C. Utricularia
D. Mimosa
Answer: A Drosera
27. Introlling of grass leaves during dry conditions is due to
A. their thin leaf blade
B. parallel venation
C. absence of palisade cells
D. presence of bulliform cells
Answer: D presence of bulliform cells
28. The movement shown by the lateral leaflets of trifoliate leaf of Indian Telegraph Plant ( Desmodium gyrans) is
A. autonomic movement of variation
B. paratonic movement of variation
C. autonomic movement of growth
D. paratonic movement of growth
Answer: A autonomic movement of variation
29. Movements in the leaf of Mimosa pudica occur due to changes in
A. pulvinus and pulvinules
B. pinna and pinnules
C. leaf and leaflets
D. petiole and rachis
Answer: A pulvinus and pulvinules
30. Thigmotropism occurs due to
A. water
B. light
C. contact
D. air
Answer: C contact
31. Growth of pollen tube towards embryo sac is
A. geotropism
B. thigmotropism
C. chemotropism
D. all of these
Answer: C chemotropism
32. Curling of tendrils is due to
A. nyctinasty
B. phototropism
C. heliotropism
D. thigmotropism
Answer: D thigmotropism
33. Sleep movements in Samanea saman are regulated by
A. N
B. P
C. K
D. Mg
Answer: C K
34. Movement of pollen tube towards ovule is
A. chemotropism
B. haptotropism
C. thigmotropism
D. phototropism
Answer: A chemotropism
35. Thigmotaxis is shown by
A. Amoeba
B. Hydra
C. Ascaris
D. Paramecium
Answer: A Amoeba
36. Movement stimulated by external factor is
A. spontaneous movement
B. autonomic movement
C. physical movement
D. paratonic movement
Answer: D paratonic movement
37. Ability of Venus Fly Trap to capture insect is due to
A. specialised muscle-like cells
B. chemical stimulation by prey
C. rapid turgor pressure
D. passive process requiring no special ability on the part of the plant
Answer: C rapid turgor pressure
38. Which flower shows nyctinastic movement?
A. Albizzia lebbek
B. Pentapetes
C. Mimosa pudica
D. Bryophyllum
Answer: B Pentapetes
39. Drooping of tamarind leaves after sunset is
A. phototropism
B. phototaxis
C. photonasty
D. chemotaxis
Answer: C photonasty
40. Response of plants due to reversible turgor change in pulvinus as a result of touch is
A. photonasty
B. thermonasty
C. seismonasty
D. cheminastry
Answer: C seismonasty
41. Which locomotory movement is not correct?
A. cyclosis and rotation of cytoplasm in Hydrilla
B. sucrose induced movement of sperms
C. flagellar movement of slime mold
D. Chlamydomonas moves away from intense light
Answer: C flagellar movement of slime mold
42. Seismonasty occurs in
A. Samanea saman
B. Albizzia lebbek
C. Hibiscus rosa sinensis
D. Mimosa pudica
Answer: D Mimosa pudica
43. Nastic movement is caused by
A. soil
B. protein
C. rainfall
D. temperature
Answer: D temperature
44. Movement of hairs in Drosera is
A. photonastic
B. thermonastic
C. thigmonastic
D. seismonastic
Answer: C thigmonastic
45. The roots bend towards the gravity due to no oxygen on the side
A. no auxin on the side of stimulus
B. less auxin on the side of stimulus
C. more auxin on the side away from stimulus
D. less auxin on the side away from stimulus
Answer: D less auxin on the side away from stimulus
46. The leaves of my Mimosa pudica (sensitive plant) droop down on touch because
A. the plant has nervous system
B. leaves are very tender
C. leaf tissues are injured
D. turgor pressure of the leaf base changes
Answer: D turgor pressure of the leaf base changes
47. Which of the following movements in plants is not related to changes in auxin levels?
A. nyctinastic leaf moments
B. movement of roots towards soil
C. movement of sunflower, tracking the direction of the sun
D. movement of shoot towards light
Answer: A nyctinastic leaf moments
48. Geotropic responses in roots are due to
A. inhibition of growth in stem
B. more growth on the upper side of the root
C. uniform growth on all sides of the root
D. more growth on the lower side of the root
Answer: B more growth on the upper side of the root
49. When a plant is rotated in a clinostat, it
A. nullifies the effect of gravity
B. nullifies the effect of light
C. both a and b
D. none of these
Answer: C both a and b
50. Nastic movements differ from tropic movements in being
A. movements of variation
B. non-directional
C. directional
D. stimulated by chemicals
Answer: B non-directional