Section A
1) Name the cell organelle which helps in the formation of lysosomes. 1
Ans: Golgi apparatus
2) Why does the growth of plant occur only in certain specific regions? 1
Ans: Growth of plants occurs only in certain specific regions because the meristematic tissues are located only at these points.
3 At a given temperature ,the solubility of a compound is 2.5% .One litre of as Solution contains 10g of this compound. Is the solution saturated or unsaturated 1n
Ans: Unsaturated.
4 Define a polyatomic ion and give one example of it. 1
ans: A group of atoms carrying a charge is known as a polyatomic ion.
Example:NH4 +,OH-.
5) (i) If two objects A and B of masses Mandmlie at a distanced from each other .The gravitational force between objects Aand B is:
(a) GM
md
2
(b) GMm
d
(c) GMm
d
2
(d) GMmd
2
ans: GMm
d.
9 The given diagram represents a prokaryotic cell.
(a) Name the parts labeled as1and 2.
Ans: 1–Plasma membrane
2–nucleoid
(b) How is the presence of chlorophyll in prokaryotic cells different from e eukaryotic cells
Ans: The chlorophyll in photosynthetic prokaryotic bacteria is associated with membran ous vesicles but not with plastids a sin eukaryotic cells.
6 How is filtration of urine in kidney Interconnected to the thinking action of the brain?
Ans:* If the kidneys are not filtering urine, poisonous substances will accumulate.
*Under such conditions the brain will not be able to think properly.
7 )What is the musculo skeletal system made up of? State two functions o ofmusculo skeletal system.
Ans: The musculo skeletal system is made up of bones and muscles.
Functions:
holds the body parts together
helps the body move.
8 ) Explainthefollowingterms:
(i) Health
(ii) Symptoms
Ans: (i) ‘Health ’is a state of being well enough to function well physically mentally and socially.
(ii) Apparent signs which give clues about theunder lying disease are called symptoms.
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