Question

a. A pickle made by Charan’s mother got spoiled after a week,and she also forgot to keep the cooked sabgi
in the refrigerator at night. It was found to have a foul smell. Give reasons how could she have prevented
them 2m
b. Unwanted plants appear very often in the fields what are they? and how do you prevent them? 2m
c. Define an organ and prokaryotic cell? 2m
d. What is animal husbandry? 2m
e. Why does the increased level of nutrients in the water affect the survival of aquatic organisms? 2m
f. List the common varieties of polyester. Also mention the natural fibres which are used for blending to
enhance their properties. 2m
2. a. How do microorganisms increase the fertility of soil? 3m
b. Why is the distance between Stars expressed in Light Years? What do you understand by the statement
that the star is 8 light years away from the earth? 3m
c. Discuss the threat to the beautiful monuments in the present world. 3m
3. Draw a neat labelled diagrams of both plant and animal cell. 4m
Section C (15 marks)
4 a) Differentiate between regular and diffused reflection. Does diffused reflection mean
the failure of the laws of reflection explain. 5m

(OR)
Describe the construction of a Kaleidoscope.

b) Avoid plastics as far as possible. Discuss on this advice. 5m
(OR)
Explain the circumstances leading to acid rain. How does acid rain affect us?
5) Discuss an activity to show that organic waste is biodegradable while plastic is not. 5m
Give me a very good answer i will give you anything

Answer 1

Answer:

b. ans - weeds are unwanted plants which we does not need they can be prevented by weedicide