You must have heard farmers talking about soil fertility. What is it? Mention some methods by which soil fertility can be replenished.

5

(a)

Explain various agricultural practices in sequential manner.

5

(a)

Observe the figure and answer the following questions.

(a) Name the microorganism and the group to which it belongs.
(b) Name the food item on which the organism grows.
(c) Does it grow well in dry or in moist conditions?
(d) Is it safe to eat infected bread?

5

(a)

What do you understand by food preservation?
Explain any four methods of food preservation.

5

(a)

Iron is more reactive than copper. Can you write an activity to show this?

5

(a)

Write the difference between metals and nonmetals on the basis of their physical properties.

5

(a)

We read in newspapers that burning of fuels is a major cause of global warming. Explain why?

5

(a)

What do you mean by protected area? Explain it with examples.

5

(a)

Explain the functions of plastids.

5

(a)

Hens and frogs are both oviparous exhibiting different types of fertilisation, explain.

5

(a)