Tag: life processes: control and coordination

Questions Related to life processes: control and coordination

Identify the physiological process induced by two phytohormones having a common precursor which is formed due to catalytic activity of pyruvic dehydrogenase complex
(a) More female flowers in Cucumber
(b) $\alpha$-amylase production in Barley grains
(c) Acceleration of fruit ripening in Tomato
(d) Delay in sprouting of Potato tubers.

biology life processes: control and coordination control and coordination in plants growth in plants chemical coordination in plants animal senses sense organs in animals sense organs in humans

  1. a, b

  2. a, c

  3. c, d

  4. b, d

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Correct Option: C
Explanation:

Ethylene is a plant hormone. It accelerates fruit ripening in tomato. Maleic hydrazide is a type of auxin, plant hormone. It delays sprouting of potato tubers. Both these hormones have common precursor that is formed due to the catalytic activity of pyruvic dehydrogenase complex.

Thus, the correct answer is option C.

The sun loving plants are referred to as

biology life processes: control and coordination movements in plants coordination in plants tropic and nastic movements in plants

  1. Halophytes

  2. Heliophytes

  3. Heterotrophs

  4. Sciophytes

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Correct Option: B
Explanation:

Halophytes are salt lovers and grow in marshy areas and other places with high salt concentrations. 

Heterotrophs are the organism that cannot manufacture their own food and depend on other living or dead organisms for their nutrition, example fungi and animals. 
Plants are autotrophs and can manufacture their own food through the process of photosynthesis. 
Plants growing in shade are called sciophytes or shade lovers. Plants growing in sun are called as heliophytes or sun lovers. Sciophytes have comparatively darker leaves and have higher amount of chlorophyll to capture scarce light. Heliophytes have lesser amount of chlorophyll as compared to sciophytes as they easily get enough light for the purpose of photosynthesis.

Bending of growing shoot towards sunlight is called

biology life processes: control and coordination movements in plants coordination in plants tropic and nastic movements in plants

  1. Heliotropism

  2. Hydrotropism

  3. Photonasty

  4. None of these

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Correct Option: A
Explanation:

Heliotropism- The growth of plants or plants parts esp flowers in response to the stimulus or sunlight, so that they turn to face the sun. It enhances the photosynthesis process and increases growth rates.

So, the correct answer is 'Heliotropism'.

The core component of central nervous system is 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Blood

  2. Neurons

  3. Ganglia

  4. Both A and B

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Correct Option: B
Explanation:
  • Neurons are the basic units of the nervous system. Every neuron is made of a cell body (also called a soma), dendrites and an axon. Dendrites and axons are nerve fibres.
  • The central nervous system consists of the brain and the spinal cord
  • The human brain contains around 100 billion neurons.
  • Hence the core component of the central nervous system is  Neuron.
  • So, the correct answer is 'Neurons'.

A minute gap across which impulse pass by neurotransmitter is called as a 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Cleft

  2. Synapse

  3. Nerve impulse

  4. None of the above

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Correct Option: B
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. Synapse is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. 
Thus, the correct answer is option B.

Area of coming together of two neuron ends or between a dendron and axon ends is?

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Junction

  2. Synapsis

  3. Synapses

  4. Synapticula

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Correct Option: C
Explanation:

  • In the nervous system, a synapse is a structure that permits a neuron (or nerve cell) to pass an electrical or chemical signal to another neuron or to the target effector cell. 
  • Synapses are stabilized in position by synaptic adhesion molecules (SAMs) projecting from both the pre- and post-synaptic neuron and sticking together where they overlap. Hence. Area of coming together of two neuron ends or between a dendron and axon ends is synapses.
So, the correct answer is 'synapses'.

A small gap that helps neurotransmitter to pass nerve impulse is called as

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Neuron

  2. Synapse

  3. Ganglia

  4. None of the above

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Correct Option: B
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. The presynaptic is the region of the axonic end of one neuron and the post synaptic is the dendritic end of the other neuron. It is a structure that permits a neuron to pass an electrical or chemical signal to another cell and acts as a communication point between the neuron and the target organ. The nerve impulses are transmitted and received with the help of this regions. 
Thus, the correct answer is option A.

The junction between two neurons is called as a synapse.
biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. True

  2. False

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Correct Option: A
Explanation:
Synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector). A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction.

So, the correct answer is 'True'.

In which region nerve impulses are transmitted and received? 

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Nodes of Ranvier

  2. Dendrites

  3. Axon

  4. Synapse

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Correct Option: D
Explanation:

The gap between two neurons across which impulses are conducted is known as a synapse. The presynaptic is the region of the axonic end of one neuron and the post synaptic is the dendritic end of the other neuron. It is a structure that permits a neuron to pass an electrical or chemical signal to another cell. It is important for neuronal function. The nerve impulses are transmitted and received with the help of this regions. 
Thus, the correct answer is option D.

Which of the following statements explain the meaning of synapse.

biology life processes: control and coordination nervous system in animals structure of neuron structure and function of neuron

  1. Junction of two nerve cells.

  2. Junction of two muscle cells.

  3. Junction of two bone cells.

  4. Junction of two sperm cells.

Show answer
Correct Option: A
Explanation:

  • Synapse, also called neuronal junction, the site of transmission of electric nerve impulses between two nerve cells (neurons) or between a neuron and a gland or muscle cell (effector)
  • . A synaptic connection between a neuron and a muscle cell is called a neuromuscular junction. 

So, the correct answer is 'Junction of two nerve cells'.