Does transpiration serve any useful function in the plants? Explain.
Why is transport of materials necessary in a plant or in an animal?
Explain.
Choose the correct option:
(a) In plants, water is transported through
(i) xylem (ii) phloem
(iii) stomata (iv) root hair
(b) Water absorption through roots can be increased by keeping the
plants
(i) in the shade
(ii) in dim light
(iii) under the fan
(iv) covered with a polythene bag
Fill in the blanks.
(i) The blood from the heart is transported to all parts of the body by
the .
(ii) Haemoglobin is present in cells.
(iii) Arteries and veins are joined by a network of .
(iv) The rhythmic expansion and contraction of the heart is called
.
(v) The main excretory product in human beings is .
(vi) Sweat contains water and .
(vii) Kidneys eliminate the waste materials in the liquid form called
.
(viii) Water reaches great heights in the trees because of suction pull
caused by .
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
The mountaineers carry oxygen with them because:
(a) At an altitude of more than 5 km there is no air.
(b) The amount of air available to a person is less than that available
on the ground.
(c) The temperature of air is higher than that on the ground.
(d) The pressure of air is higher than that on the ground.
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