A. Answer in one word only.
110 x 1/2 mark)
1. Are non-green plants autotrophs or heterotrophs?
2. What kind of nutrition is seen in animals?
3. By what methods-physical or chemical—is it possible to break a compound into its
constituents?
4. What is the base of all plant fibres?
5. In which method of transfer of heat do molecules themselves travel from the hot portion to
the cold portion?
6. If a vegetable tastes bitter, what is it likely to have in it-a base or an acid?
7. Is rusting a physical or a chemical change?
8. Is heat a form of energy or a form of matter?
9. Fill in the blanks: The nearer a place is to the equator the
(warmer/colder) it is
expected to be.
10. Humus is found in all layers of the soil. True or false?
2 marksi
Answers
Explanation:
Question 1:
The life porcess/processes that provides/provide energy is/are
(a) nutrition
(b) respiration
(c) both nutrition and respiration
(d) response to stimuli.
ANSWER:
(c) both nutrition and respiration
Nutrition is the process of obtaining food and utilising it, and respiration is the oxidation of food for obtaining energy.
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Question 2:
Which of these are autotrophs?
(a) all plants
(b) green plants
(c) all animals
(d) unicellular organisms
ANSWER:
(b) green plants
Because green plants are capable of making their own food, they are called autotrophs.
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Question 3:
Which of these is not necessary for photosynthesis?
(a) carbon dioxide
(b) chlorophyll
(c) light
(d) nitrogen
ANSWER:
(d) nitrogen
Green plants, due to the presence of chlorophyll in their leaves, can perform photosynthesis in the presence of light by using carbon dioxide as a raw material. Nitrogen is not needed for it.
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Question 1:
What is nutrition?
ANSWER:
Nutrition is defined as the process of obtaining food and utilising it by any organism. Nutrition is one of the key processes of obtaining energy from food.
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Question 2:
What are 'stomata'? Where are they normally found?
ANSWER:
Stomata are the tiny pores on the leaves through which plants absorb atmospheric carbon dioxide. They are normally found on the underside of the leaves.
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Question 3:
Write down the chemical equation for manufacture of food in green plants.
ANSWER:
The chemical equation representing the process of manufacturing food by green plants (photosynthesis) is as follows:
Carbon dioxide + Water −→−−−−ChlorophyllSunlight Glucose + Oxygen
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Question 4:
What factors are essential for photosynthesis to take place?
ANSWER:
Factors essential for photosynthesis are sunlight, water, carbon dioxide and chlorophyll (green pigment present in the leaves).
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Question 5:
How does an insectivorous plant absorb nutrients from an insect trapped by it?
ANSWER:
Insectivorous plants secrete digestive juices to digest the insect trapped by them. These plants then absorb the nutrients released from the digested insect.
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Question 6:
Why is nitrogenous fertilizer not added in soil in which leguminous plants are grown?
ANSWER:
Nitrogenous fertilisers are not added to the soil in which leguminous plants are grown because these plants can fix atmospheric nitrogen in the soil with the help of the bacteria Rhizobium present in their root nodules. These bacteria can fix the atmospheric nitrogen in soluble compounds which can be absorbed by the plants.
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