Class 7 Science - Chapter Transportation in Animals and Plants NCERT Solutions | Does transpiration serve any useful func
Does transpiration serve any useful function in the plants? Explain.
The process of Transpiration is the loss of water from leaves that serves very useful function in the plants because it generates s ‘suction force’ in xylem which can pull water from the roots up to great height in the tall trees which is known as ascent of sap.
Another function of transpiration is that it keeps the plant cool in higher temperature by the evaporation. The rate of transpiration increase in moving air because this carries away water vapour from leaves as fast as it comes out of stomata. Higher vapour pressure differences between leaf air spaces and the external air increases the transpiration rate. And, when the rate of transpiration increases, the rate of absorption of water through the roots also get increased. Thus, by keeping a plant under the fan, water absorption through roots can be increased.
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:-
What are stomata? Give two functions of stomata.
- 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:-
What are the components of blood?
- Q:-
Why is transport of materials necessary in a plant or in an animal? Explain.
- Q:-
What will happen if there are no platelets in the blood?
- Q:-
Why is it necessary to excrete waste products?
- Q:-
Why is blood needed by all the parts of a body?
- Q:-
What makes the blood look red?
Popular Questions of Class 7 Science
- Q:-
State similarities and differences between the laboratory thermometer and the clinical thermometer.
- Q:-
State differences between acids and bases.
- Q:-
Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food - Q:-
Name the elements that determine the weather of a place.
- Q:-
Fill the missing word in the blank spaces in the following statements:
(a) Wind is——————air.
(b) Winds are generated due to —————— heating on the earth.
(c) Near the earth’s surface __________air rises up whereas ___________ air comes down.
(d) Air moves from a region of ——— pressure to a region of ———. - Q:-
In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants - Q:-
Why does an athlete breathe faster and deeper than usual after finishing the race?
- 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?
Recently Viewed Questions of Class 7 Science
- Q:-
What is a virtual image? Give one situation where a virtual image is formed.
- Q:-
Give a brief description of the process of synthesis of food in green plants.
- Q:-
Choose the correct option. The total water
(i) in the lakes and rivers of the world remains constant.
(ii) under the ground remains constant.
(iii) in the seas and oceans of the world remains constant.
(iv) of the world remains constant. - Q:-
Match the items of Column I with suitable items in Column II
Column I Column II
(a) Salivary gland (i) Bile juice secretion
(b) Stomach (ii) Storage of undigested food
(c) Liver (iii) Saliva secretion
(d) Rectum (iv) Acid release
(e) Small intestine (v) Digestion is completed
(f ) Large intestine (vi) Absorption of water
(vii) Release of faeces - Q:-
Suppose the two photographs, shown in Fig. 13.1 and Fig. 13.2, had been taken at an interval of 10 seconds. If a distance of 100 metres is shown by 1 cm in these photographs, calculate the speed of the blue car.
- Q:-
Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
- Q:-
Here is a crossword puzzle: Good luck!
Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human bodyDown
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water - Q:-
You must be familiar with the following nursery rhymes:
(i) ‘Baa baa black sheep, have you any wool.’
(ii) ‘Mary had a little lamb, whose fleece was white as snow.’Answer the following:
(a) Which parts of the black sheep have wool?
(b) What is meant by the white fleece of the lamb? - Q:-
Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.
- Q:-
Explain how painting of an iron gate prevents it from rusting.
- All Chapters Of Class 7 Science
- All Subjects Of Class 7