Tag: movement in plants

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Multiple choice movement in plants living world of plants - plant physiology biology

Some flowers (e.g., Oxalis) open in the morning and close during evening because of

  1. Photonasty

  2. Phototropism

  3. Phototaxis

  4. Nyctinasty
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nastic movements are responses of plant parts to stimuli. Photonastic movement is the nastic response of plant in response to light. Oxalis flowers open in the morning and close during evening because of photonasty. Phototropism is the growth of a plant part in response to light. Phototaxis is the movement of a plant part in response to light. Nyctinasty is the rhythmic nastic movement of plant in response to the onset of darkness. 

Thus, the correct answer is 'Photonasty'

Multiple choice movement in plants living world of plants - plant physiology biology

Which of the following pair is proper for plant movement?

  1. Thermotaxis - Chlamydomonas

  2. Thigmotaxis - Zoospore in Oedogonium

  3. Rotation movement - Cytoplasm in Tradeschantia anther

  4. Chemotaxis - Zoospore of Volvox
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Movement of plant in response to heat is called as thermotaxis. Movement of plant in response to a touch stimulus is called as thigmotaxis. Example include zoospore in Oedogonium. Movement of plant in response to external chemical is called as chemotaxis. Movement of plant in response to light is called as phototaxis. Chlamydomonas shows phototactic movement. 

Thus, the correct answer is 'Thigmotaxis - Zoospore in Oedogonium.'

Multiple choice movement in plants living world of plants - plant physiology biology

Which locomotory movement is not correct?

  1. Cyclosis and rotation of cytoplasm in Hydrilla

  2. Sucrose induced movement of sperms

  3. Flagellar movement of slime mould

  4. Chlamydomonas moves away from intense light
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyclosis is also called as cytoplasmic streaming. It is the directed movement of cytosol and organelles. Rotational cyclosis is seen in Hydrilla. Sperm movement is induced by the change in intracellular ion concentration. Sperm motility is also induced by sucrose. Flagella is a locomotory organ that is seen in slime mould along with fungi, protozoan, etc. Slime mould shows flagellar movement. Chlamydomonas move towards the light.

Thus, the correct answer is option D.

Multiple choice movement in plants living world of plants - plant physiology biology

Opening of floral buds is

  1. Autonomic movement of variation

  2. Paratonic movement of growth

  3. Autonomic movement of growth

  4. Autonomic movement of locomotion
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Opening of floral buds into flower is a type autonomic movement of growth. It is a nastic movement. Nastic movement is a non-directional movement shown by plant part in response to external stimuli. Greater growth on one side results in the bending on the opposite side. 
Thus, the correct answer is option C.
Multiple choice movement in plants living world of plants - plant physiology biology

Thigmonastic movement is found in

  1. <p> Albizzia</p>

  2. <p> Oxalis</p>

  3. <p> Drosera</p>

  4. <p> Nepenthes</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thigmonastic movement is the nastic or nondirectional movement shown by plant part in response to the touch or vibration. Plants like Mimosa and Albizzia shows thigmonastic movement. Oxalis shows photonastic movement. Drosera shows haptonastic movement. 

Thus, the correct answer is 'Albizzia'.