Class 7 Science - Chapter Transportation in Animals and Plants NCERT Solutions | What will happen if there are no platele
What will happen if there are no platelets in the blood?
Platelets are pale yellow in colour and are also called thrombocytes; are the tiny fragments of megakaryocyte cells in which cytoplasm remains enclosed by the piece of plasma membrane but lacks nuclei. Thrombopoietin hormone is produced by the liver which increases the number of megakaryocytes in the bone marrow and which automatically stimulates platelets production. Platelets are mainly involved in blood clotting (transformation of blood from liquid into solid gel).
They helps to stop blood loss from the damaged blood vessels by forming platelet plus (thin layer). Their granules contains chemical when they released, they promote blood clotting. And, when they bind to clot and prevents from blood loss. Thus, if there are no platelets in the blood, there will be excessive loss of blood during the injury.
More Questions From Class 7 Science - Chapter Transportation in Animals and Plants
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What are stomata? Give two functions of stomata.
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Draw a diagram of the human excretory system and label the various parts.
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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.
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Does transpiration serve any useful function in the plants? Explain.
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What are the components of blood?
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Why is transport of materials necessary in a plant or in an animal? 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?
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What makes the blood look red?
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(e) Seed dispersal takes place by means of _____________, _____________ and _____________. - Q:-
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(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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