Q.(1) Weeds compete with the crop for water, nutrients, space and sunlight. (T/F)
Q.(2) Write any two examples of exhaustible natural resources.
Q.(3) Name the two gases whose presence in the atmosphere leads to acid rain.
Q.(4) The size of a pupil becomes ______ when we see in dim light.
Q.(5) Metals are______ conductors of heat and ___________.
Q.(6) All the animals of a natural habitat are known as________.
Q.(7) Carrier of Malaria-causing protozoan is:
(a) Female anopheles mosquito (c) Cockroach
(b) Housefly (d) Butterfly
Q.(8) What is the Jelly like structure composed within the cell called?
Q.(9) A tadpole develops into an adult frog by the process of:
(a) Fertilization (c) Metamorphosis
(b) Budding (d) Embedding
Q.(10) Cell is discovered by;
(a) Robert Coach (c) John Re
(b) Charles Darwin (d) Robert Hooke.
Q.(11) What is the process of conversion of sugar in to alcohol is called?
Q.(12) Due to which structure amoeba has irregular shape?
Q.(13) What is the stage of the embryo in which all body parts can be identified?
Q.(14) Name the petroleum product used for surfacing of roads?
Q.(15) A person 2m in front of a plane mirror seems to be_______m from his image.
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Answer:
1. True
2.water,natural oxygen
3.sulphur dioxide and nitrogen oxide
4.enlarge or big
5.good, electricity
6.wildlife sanctuary
7. (a) female anopheles mosquito
8.cytoplasm or cytosol
9. (C) metamorphosis
10. (d) Robert Hooke
11. fermentation
12.due to continuous bulging out of cytoplasm and pseudopodia
13.foetus
14.bitumen
15.2m , exact same
Explanation:
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