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Class 10 Science CONTROL AND COORDINATION Important questions



In this page we have Class 10 Science CONTROL AND COORDINATION Important questions . Hope you like them and do not forget to like , social shar and comment at the end of the page.


Question 1
Why is control and coordination system necessary in organisms?
Answer
All organisms have mechanisms to control their functions. However, in higher organisms the system required is more complex as the individual is a complex multicellular organism with the parts separated by greater distance.
Question 2
What is homeostasis?
Answer
Homeostasis comes from two words- ‘homeo’ meaning same and ‘stasis’ meaning steady state within the body
Question 3
Give examples of some of the movements shown by plants
Answer
Movements as in animals is absent in plants except in cases of sperm cells of ferns and mosses swimming towards the egg. In plants, movement is association with the growth of the plants. For example, the shoot system moves towards sunlight and the root system towards earth.
Question 4
What are growth regulators?
Answer
Growth regulators are the chemicals that either promote or inhibit growth of the plants, their development and their responses to the environment. They are also called the phytohormones.
Question 5
What are the stages of growth in plants?
Answer
Growth in plants has three stages: Cell division, Cell enlargement, Cell differentiation.
Question 6
Name the different phytohormones.
Answer
The different phytohormones are auxins, gibberellins, cytokinins, ethylene and abscissic acid.
Question 7
What are auxins?
Answer 
Auxins are phytohormones that are concerned with shoot and root elongation, maintaining dormancy and apical dominance.
Question 8
Give four major functions of auxins.
Answer 
Four major functions of auxins are:
  1. Elongation of stem and root: In high concentrations it causes stem elongation ad in low concentration, it causes root elongation.
  2. Apical dominance: As long as the apical buds produce auxins, the lateral buds are not allowed to grow.
  3. Prevention of abscission: As long as the leaves and fruits produce auxin, they remain attached to the plant. If they stop producing auxins, they fall.
  4. Parthenocarpy: Auxins induce the ovaries to produce fruits without fertilization and this is called Parthenocarpy. It results in seedless fruits. For example, papaya, orange, etc.

Question 9
What are gibberellins and where are they synthesized?
Answer 
Gibberellins are plants hormones that are mainly responsible for cell elongation. They are synthesized in embryos, young leaves, root tips, buds and seeds.
Question 10
What is the most important commercial application of gibberellins?
Answer 
GA-3 (gibberellic acid), a gibberellin that has been studied the most, causes the barley seeds to produce the starch- digesting enzymes like maltase, amylase. This process is called malting. It is used in the brewing industry.
Question 11
What are cytokinins? Give an example.
Answer 
They are phytohormones that induce cell division even in mature tissues. They were named ‘cytokinins’ as the cell division is also called cytokinesis. For example: zeatin, a cytokinin present in maize grains.
Question 12
Give one use of cytokinins in tissue culture.
Answer 
Cytokinins are used in tissue culture to induce cell division in mature tissues.
Question 13
Name the phytohormone that causes ripening of fruits. Give one more function of this phytohormone.
Answer 
The growth regulator that causes ripening is ethylene. It also promotes flowering.
Question 14
Name a growth inhibitor. Give two o its functions.
Answer 
Abscisic acid is a growth inhibitor. Its functions are:
  1. It causes bud and seed dormancy
  2. It results in abscission of leaves and fruits



Question 15
What are the control and coordination mechanisms developed in animals?
Answer 
The two control and coordination mechanisms developed in animals are: Nervous system, Endocrine system
Question 16
How does the conduction of messages take place in?
(i) Nervous system    
(ii) Endocrine system
Answer 

Nervous system

The conduction in nervous system takes place with the help of electrical impulses travelling along the nerves

Endocrine system

The conduction in endocrine system takes place by the hormones being circulated in blood.

Question 17
What are the functions carried out by the nervous system in human beings?
Answer 
The functions carried out by the nervous system in human beings are:

i)

It perceives the changes around us through our senses

ii)

It controls and coordinates all the activities of the muscles in response to the changes outside.

iii)

It also maintains the internal environment of the body by coordinating the functions of the various internal organs and the involuntary muscles

iv)

It stores the previous experiences as memory that helps to think and analyses our reactions

v)

It conducts messages between different parts of the body.

Question 18
What are the units of nervous system?
Answer 
The units of nervous system are specialized cells called the neurons.
Question 19
What is an impulse?
Answer 
An impulse is an electrical disturbance.
Question 20
What are the two potentials that are generated while transmission of an impulse?
Answer 
The two potentials are resting potential a

 


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