Class 7 Science - Chapter Transportation in Animals and Plants NCERT Solutions | What are stomata? Give two functions of
What are stomata? Give two functions of stomata.
Stomata are the specialized epidermal structures consists of small pores (surrounded by guard cells) which are responsible for the gaseous exchange between plant and the environment. Transpiration is the loss of water from the aerial parts of the plants like leaves in the water vapours form; and this occurs through the stomata which is known as stomatal transpiration.
FUNCTIONS OF STOMATA:
1. Stomatal opening and closing helps in the gaseous exchange between the plant’s internal tissue and the atmosphere. 2. It helps in transpiration (loss of water); excess water in the form of water vapour. 3. Stomatal closure at night prevents from water loss, from escaping through pores because at night plants respires like animals. 4. It maintains the moisture balance according to weather. 5. Stomata facilitate gaseous exchange as carbon dioxide uptake and release of oxygen during the process of photosynthesis.
More Questions From Class 7 Science - Chapter Transportation in Animals and Plants
- Q:-
Draw a diagram of the human excretory system and label the various parts.
- Q:-
Match structures given in Column I with functions given in Column II.
Column I Column II
(i) Stomata (a) Absorption of water
(ii) Xylem (b) Transpiration
(iii) Root hairs (c) Transport of food
(iv) Phloem (d) Transport of water
(e) Synthesis of carbohydrates - Q:-
Describe the function of the heart.
- Q:-
Does transpiration serve any useful function in the plants? Explain.
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Why is it necessary to excrete waste products?
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Why is blood needed by all the parts of a body?
- Q:-
What makes the blood look red?
Popular Questions of Class 7 Science
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(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
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(f ) Digestion of food - Q:-
Name the elements that determine the weather of a place.
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Fill the missing word in the blank spaces in the following statements:
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(b) Winds are generated due to —————— heating on the earth.
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(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants - Q:-
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- Q:-
Fill in the blanks:
(a) Production of new individuals from the vegetative part of parent is called_____________.
(b) A flower may have either male or female reproductive parts. Such a flower is called_____________.
(c) The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as _____________.
(d) The fusion of male and female gametes is termed as _____________.
(e) Seed dispersal takes place by means of _____________, _____________ and _____________. - Q:-
Classify the following as motion along a straight line, circular or oscillatory motion:
(i) Motion of your hands while running.
(ii) Motion of a horse pulling a cart on a straight road.
(iii) Motion of a child in a merry-go-round.
(iv) Motion of a child on a see-saw.
(v) Motion of the hammer of an electric bell.
(vi) Motion of a train on a straight bridge. - Q:-
Why do organisms need to take food?
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(c) becomes cold by the process of radiation.
(d) does not become cold. - Q:-
Mark ëTí if the statement is true and ëFí if it is false:
(i) During heavy exercise the breathing rate of a person slows down. (T/F)
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Match the items given in Column I with one or more items of Column II.
Column I Column II
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(b) A convex mirror (ii) Can form image of objects spread over a large area.
(c) A convex lens (iii) Used by dentists to see enlarged image of teeth.
(d) A concave mirror (iv) The image is always inverted and magnified. (e) A concave lens (v) The image is erect and of the same size as the object.
(vi) The image is erect and smaller in size than the object.
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