Tag: movement and locomotion in living organisms

Questions Related to movement and locomotion in living organisms

The shoot system of any plant responds towards the stimulus of

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

  1. Air

  2. Light

  3. Water

  4. Soil

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Correct Option: B
Explanation:

Shoot system shows positive phototropism means it will grow or change its direction in the way where light is present. It is known as the directional movement of plant.

So the correct option is 'Light'.

A plant uses .......... means to transfer information from one cell to another as there is no specialized tissue present for the conduction of information. 

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

  1. Thermal

  2. Electrical

  3. Chemical

  4. Electrochemical

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Correct Option: D
Explanation:
The most rapid methods of long distance communication between plant tissues and organs are bioelectrochemical signals. The action potential propagates rapidly throughout the plant along electrified interfaces. A potential pathway for transmission of this electrical signal might be the phloem sieve-tube system since it represents a continuum of plasma membranes. A phloem is an electrical conductor of bioelectrochemical impulses over long distances. At the cellular level in plants, electrical potentials exist across membranes, and thus between cellular compartments, as well as within specific compartments. Electrochemical phenomena are primary, and then deep cytophysiological reactions occur.

So, the correct answer is 'Electrochemical'.

Certain movements of plants do not result in their growth and are termed as movements which are growth

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

  1. Dependent

  2. Suppressive

  3. Independent

  4. Obstructive

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Correct Option: C
Explanation:

Growth independent movement is a directionless movement of the plant caused due to the variation of the outside environment and plants movement is neither toward nor away from a stimulus. The example is touch me not plant or Mimosa Pudica which fold its leaves due to touching. This movement is not involved in growth hence it is growth independent.

So the correct option is 'Independent'.

The growth of the shoot in the direction of source of light is an example of growth independent movement.

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

  1. True

  2. False

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Correct Option: B
Explanation:

The growth of shoot is the directional movement of the plant that occurs in the direction of stimulus (light) and plant move towards the light and grows in that direction.

So the given statement is 'False'.

The movement of plant towards the direction of light is known as

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

  1. Ciliary movement

  2. Autotropic movement

  3. Phototropic movement

  4. Heterotropic movement

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Correct Option: C
Explanation:

Photo means light and tropic means movement so the movement of plants towards light is phototropic movement and is usually shown by the stem of the plant that is why it is known as positively phototropic.

So the correct option is 'Phototropic movement'

Trophic movements are growth movements of plants in response to a stimulus from a specific direction.

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

  1. True

  2. False

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Correct Option: A
Explanation:

When a plant shows some growth movement in response to a stimulus, it is known as tropism. Tropism is direction specific and depends on the direction of stimulus. Plants may either show positive or negative movement as a response to a stimulus. If the movement is towards the direction of stimuli, it is known as positive tropism while movement away from stimuli is known as negative tropism. Answer is true.

Stems are positively geotropic while roots are negatively geotropic.

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

  1. True

  2. False

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Correct Option: B
Explanation:

Geotropism means growth in response to the gravitational force. Stems grow away from ground (ie in opposite direction in which the gravitational force is exerted), while roots grow toward the ground. Therefore, stems are negatively geotropic, which roots are positively geotropic.

Positive geotropism of root is due to greater growth on upper side as compared to lower side.

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

  1. True

  2. False

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Correct Option: B
Explanation:

Geotropism is also known as Gravitropism. It is a phenomenon in which growth movement by a plant turns in response to gravity. Roots show positive geotropism as they grow towards the gravity while stems show negative geotropism as they grow upwards. Hence, root shows greater growth on lower side as compared to upper side in positive geotropism.

Thus, the correct answer is option B.

The discovery of auxin is traced back to the work of Charles and Francis Darwin on

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

  1. Photonastic movement

  2. Photoperiodism

  3. Phototropism

  4. None of these

Show answer
Correct Option: C
Explanation:

The work of Charles and Francis Darwin regarding phototropism led to trace back the discovery of Auxin. Tropisms represent the movement in the plant parts which are directed or stimulated by specific stimuli. Plants show phototropism in response to light stimulus. Auxin plays a vital role in exhibiting phototropism in plants.

How does phototropism occur in plants?

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

  1. If a plant part moves towards the light,it is called positive phototropism.

  2. If a plant part moves opposite direction of light,it is called positive phototropism.

  3. If a plant part do not move towards the light,it is called positive phototropism.

  4. None of the above.

Show answer
Correct Option: A
Explanation:
  • Phototropism is the growth of organisms in response to a stimulus. This causes the plant to have elongated cells on the farthest side from the light. Phototropism is one of the many plant tropisms or movements which respond to external stimuli. 
  • Growth towards a light source is called positive phototropism, while growth away from light is called negative phototropism. Most plant shoots exhibit positive phototropism, and rearrange their chloroplasts in the leaves to maximize photosynthetic energy and promote growth.
    Hence, option A is correct.