Tag: biology

Questions Related to biology

Comparing the somatic nervous system with the autonomic nervous system, which of the following statement is true?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Autonomic nervous system produces involuntary movement in skeletal muscle

  2. Somatic nervous system produces voluntary movement in glands and smooth muscle

  3. Autonomic nervous system produces voluntary movement in smooth muscle and glands

  4. Autonomic nervous system produces involuntary movement in smooth muscle, viscera and glands

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Correct Option: D
Explanation:

The autonomic nervous system is the part of the nervous system that supplies that internal organs, including the blood vessels, stomach, intestine, liver, kidneys, and digestive glands.

So, the correct option is 'Autonomic nervous system produces involuntary movement in smooth muscle, viscera and glands'.

Premotor area of brain is the highest centre of

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Thinking

  2. Autonomous nervous system

  3. Movements of involuntary muscles

  4. Both B and C

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Correct Option: D
Explanation:

The premotor area occurs in the frontal lobe of the cerebrum. It is made up of the neurons that form the part of the autonomous nervous system and movements of the involuntary muscles like movements of pharynx and larynx. The prefrontal cortex of the frontal lobe is concerned with thinking and reasoning.

Hence, the correct answer is 'Both B and C'

Parasympathetic nervous system is also termed as

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Visceral

  2. Thoracico-lumbar

  3. Cranio-sacral

  4. Mesenteric

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Correct Option: C
Explanation:

The parasympathetic nervous system is a division of the autonomic nervous system. The preganglionic nerve fibres of this system arise from the brain which includes cranial nerves III, VII, IX and X, that is, the oculomotor, facial, glossopharyngeal and vagus nerves, as well as from the sacral region of the spinal cord, that is, ramus communicans 2, 3 and 4. The sympathetic nervous system is called the thoracico-lumbar.

Hence, the correct answer is 'Cranio-sacral'

Which of the following is not true concerning the autonomic nervous system?

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. Sympathetic responses include fight-or-flight responses

  2. Sympathetic responses are generally widespread throughout the body

  3. It includes sensory pre- and postganglionic fibres

  4. Autonomic division is entirely motor

Show answer
Correct Option: C
Explanation:

The autonomic nervous system is the part of the nervous system that supplies internal organs, including the blood vessels, stomach, intestine, liver, kidneys, and digestive glands.

So, the correct option is 'It includes sensory pre- and postganglionic fibres'.

Choose the correct answer from the alternatives given.
All visceral effectors are innervated by both the parasympathetic and sympathetic divisions of the autonomic nervous system for coordinating various activities of the body This concept is known is

biology nervous system of man divisions of nervous system autonomic nervous system the human brain

  1. sensory/motor regulation

  2. dual innervation

  3. autonomic summation

  4. neurotransmitter trade-off

Show answer
Correct Option: B
Explanation:

There is a dual innervation of most organs of the body by the sympathetic and parasympathetic divisions of the ANS. The connection of both systems with the hypothalamus and higher brain areas have been omitted.

So, the correct option is 'dual innervation'.

Plants adapted to open, sunny habitats are

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. Sciophytes

  2. Heliophytes

  3. Mesophytes

  4. Epiphytes

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Correct Option: B

Plants growing under shade of other plants are

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. Epiphytes

  2. Semi-epiphytes

  3. Mesophytes

  4. Sciophytes

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Correct Option: D

Heliophytes differ from sciophytes in having

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. Shorter internodes and thicker leaves

  2. Longer internodes and thinner leaves

  3. Shorter internodes and thinner leaves

  4. Longer internodes and thicker leaves

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Correct Option: A

Match column I with column II

   Column I    Column II
 A.  Halophytes  1.  Saline soil
 B.  Psammophytes  2.  Sandy soil
 C.  Chasmophytes  3.  Rock crevices
 D.  Oxylophytes  4.  Acidic soil

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. A- 1, B- 2, C- 3, D- 4

  2. A- 1, B- 3, C- 2, D- 4

  3. A- 1, B- 4, C- 3, D- 2

  4. A- 1, B- 3, C- 4, D- 2

Show answer
Correct Option: A
Explanation:
   Column I  Column II
 A.  Halophytes  Saline soil
 B.  Psammophytes  Sandy soil
 C.  Chasmophytes  Rock crevices
 D.  Oxylophytes  Acidic soil

Hence, option A is correct.

Tall trees of what range of height have strong butresses at their base?

biology adapting to a habit extreme adaptations adaptive features adaptations of organisms

  1. 5-7 m

  2. 15 m and above

  3. 3-5 m

  4. 7-10 m

Show answer
Correct Option: B
Explanation:

The trees having a height 15 m and above have strong buttresses at their base. Buttresses are modified roots appear from the basal parts of main stem and spread in different directions in the soil, eg, Ficus, Bombax, etc. Thus the correct answer is option B.