Tag: control and co-ordination in plants and animals

Questions Related to control and co-ordination in plants and animals

Spinal reflex is located in the ________

zoology control and co-ordination in plants and animals the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Nerves

  2. Brain

  3. Epithelial lining

  4. Spinal cord

Show answer
Correct Option: D
Explanation:

  • Spinal reflex or withdrawal reflex protects the body from the damaging stimulus. 
  • It is located in the spinal cord. In this reflex pathway, more than one relay neuron connects the sensory and motor neuron.

Therefore, the correct answer is option D.

Reflex arc is a neural pathway that involves .......... nervous system. 

zoology control and co-ordination in plants and animals the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Peripheral

  2. Autonomous

  3. Central

  4. Both A and C

Show answer
Correct Option: D
Explanation:

  • Reflex arc involves both peripheral and central nervous systems. As the route followed by nerve impulses in the production of a reflex act, is from the peripheral receptor organ, through the afferent nerve, to the central nervous system synapse, and then through the efferent nerve, to the effector organ. 

Therefore, the correct answer is option D.

Reflex arc located in the brain is called as___________

zoology control and co-ordination in plants and animals the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. Somatic reflex

  2. Cerebral reflex

  3. Autonomic reflex

  4. Both A and B

Show answer
Correct Option: B
Explanation:

  • The reflex actions which involve the brain are called as the cerebral reflex. The autonomic reflex is the one that involves inner organs and the somatic reflex is one that involves the muscles. 

Therefore, the correct answer is option B.

Which of the following statements is correct about reflex arc?

(i).  Reflex arcs are efficient quick responses.
(ii). Reflex arcs are evolved for functioning in the absence of true thought processes.
(iii). A reflex arc is a neural pathway that controls reflex action.

zoology control and co-ordination in plants and animals the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. (i), (ii) and (iii) 

  2. Only (i) 

  3. Only (ii) 

  4. Only (i) and (ii) 

Show answer
Correct Option: A
Explanation:

  • Reflex arcs have evolved in animals because the thinking process of the brain is not fast enough. 
  • Many animals do not have complex neuron networks which is needed for thinking and it is considered efficient. It is a neural pathway that controls a reflex action, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. 
  • This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain, although the brain will receive sensory input while the reflex is carried out. 
  • Analysis of the signal takes place after the action has been taken. 

Therefore, the correct answer is option A.

A boy running, children fighting in the ground, baby chewing food are movements caused by growth. 

zoology control and co-ordination in plants and animals the reflex action reflex action and reflex arc basic reflex action and reflex arc

  1. True

  2. False

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Correct Option: B
Explanation:

  • The movement mentioned in the above question are regular activities done by animals and humans. 
  • They are not associated with growth, as growth does not depend on these movements. The stop and start of these activities does not regulate growth.

Therefore, option B is the correct answer.

The term synergistic action of hormones refers to

biology control and co-ordination in plants and animals movements in plants coordination in plants tropic and nastic movements in plants

  1. When two hormones act together but bring about opposite effects.

  2. When two hormones act together and contribute to the same function.

  3. When one hormone affects more than one

  4. When many hormones bring about any one function.

Show answer
Correct Option: B
Explanation:
Growth, differentiation and development processes of plants are found to be regulated by two or more phytohormones acting synergistically or antagonistically, e.g. cell division is promoted by both auxins and cytokinins acting synergistically. Cell growth is controlled by auxins, gibberellins, and cytokinins. Morphogenesis is an interplay of auxins and cytokinins, where both must be present in some minimum concentration.
So the correct answer is 'When two hormones act together and contribute to the same function.'.

Movement caused by injury is

biology control and co-ordination in plants and animals movements in plants coordination in plants tropic and nastic movements in plants

  1. Traumotropism

  2. Rheotropism

  3. Traumonasty

  4. Rheonasty

Show answer
Correct Option: A
Explanation:

The movement of plant part as a result of injury is called as traumatropism. It this, due to injury or wound, plant changes its orientation. Growth of plant part in response to the current of water is called as rheotropism. Folding of leaves in response to injury is called as traumonasty. 

Thus, the correct answer is option A.