Tag: coordination in plants

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Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Hormone involved in phototropism is ____________.

  1. IAA

  2. gibberellin

  3. kinetin

  4. 2, 4-D.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Phototropic curvature is the result of uneven distribution of auxin. Darwin and Darwin observed that the coleoptiles of canary grass responded w unilateral illumination by growing towards the light source (phototropism). After a series of experiments, It was concluded that the tip of coleoptile contains auxin that caused the bending of the entire coleoptile in relation to the direction of light.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Which plant hormone induces the phenomenon of phototropism in plants?

  1. Auxins

  2. Ethylene

  3. Cytokinin

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

Auxins induce phototropism in plants, that growth of a plant part towards light (shoot) or away from light (root). 

Auxins bring about elongation and growth of the shoot towards light, being sensitive to light accumulate in the region opposite to the direction in which growth has to take place, here it brings about elongation of the cells and growth of the shoot in the direction of light.
So, the correct answer is 'Auxins'

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Growth of pollen tube towards embryo sac is?

  1. Chemotropic

  2. Thigmotaxis

  3. Geotropic

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pollen tube paves its way through the solid part of the stigma and style by secreting pectinases and hydrolytic enzymes. Pollen tube travels inter-cellularly and chemotropically along the concentration gradient of calcium-boron-Inositol sugar complex.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Example of positive geotropism is 

  1. Closing of flowers

  2. Upwards growth of stem

  3. Downward growth of root

  4. Lateral growth of root
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Positive geotropism is the movement towards earth. In the case of roots, they grow towards the earth and are thus, called as positively geotropic. Whereas shoots are negatively geotropic.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Geotropic response is perceived by

  1. Mature roots

  2. Elongating cells

  3. Root cap

  4. Root hairs
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Geotropic stimulus is perceived by root cap in case of root and by stem apex in case of stem. Geotropic stimulus is perceived by root cap because it is the adjacent part in touch with soil. In the case of aquatic plants, the plant has root pocket instead of root cap in terrestrial plants
So, the correct answer is 'Root cap'
Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

Irritability/Reactivity/Sensitivity of a plant is

  1. Response to stimulus in soil

  2. Response to a change in environment

  3. Movement caused by an external force

  4. Ability to move
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Irritability, reactivity and sensitivity are excitatory response shown by plants to respond to changes in their environment. The most common response shown by plants is movement in response to environment change. For example, closing of leaves of Mimosa pudica on touching or closing of traps on a Venus fly trap.

Thus, the correct answer is option B. 

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The site which receives the phototropic stimulus is

  1. Shoot apex (tip)

  2. Root apex (tip)

  3. Meristematic regions

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

The area of the plant which receives a stimulus is called as perceptive region. Tip or apex of the shoot is the perceptive region for the light. It is the site which receives the phototropic stimulus and shows corresponding response. 

Thus, the correct answer is option A.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The movement of plant organs in response to force of gravity is called

  1. Phototropism

  2. Thigmotropism

  3. Geotropism

  4. Chemotropism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The movement of plant part in response to contact with a solid touch is called as thigmotropism. The movement of plant part in response to light is called as phototropism. The movement of plant part in response to force of gravity is called as geotropism. The movement of plant part in response to external chemical stimulus is called as chemotropism.

Thus, the correct answer is option C.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

The stem bends upwardly and root downwardly under the influence of gravity because

  1. Of nature of stem and root

  2. Stem is photonastic and root geonastic

  3. Stem is negatively geotropic and root positively geotropic

  4. Stem is negatively hydrotropic and root positively hydrotropic
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The movement of plant part in response to force of gravity is called as geotropism. The movement of plant part towards the gravity is called as positive geotropism. Roots show positive geotropic movement. The movement of plant part away from the gravity is called as negative geotropism. Stems show negative geotropic movement. 

Thus, the correct answer is option C.

Multiple choice biology movement and locomotion in living organisms movements in plants coordination in plants tropic and nastic movements in plants

.......... is a plant hormone which inhibits growth leading to wilting of leaves.

  1. Absicic acid

  2. Gibberillins

  3. Auxins

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

Wilting of leaves is the loss of rigidity and caused when turgor pressure is lignified and reach zero it happens in the inadequate water supply and is caused by the hormone abscisic acid to prevent water loss.

So the correct option is 'Abscisic acid'.