Q6 of 60 Page 1

List two reasons to show that the existence of decomposers is essential in an ecosystem.

The existence of decomposers is essential in an ecosystem because:

1. They cleans the environment by converting the remnants of dead plants and animals into simpler substances.


2. They helps in replenishment of nutrients to soil.


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4

"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.

 5

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should the position of the object' be relative to the mirror? Draw ray diagram to justify your answer.

 10

A student wants to project the image of a candle flame on a screen 48 cm in front of a mirror by keeping the flame at a distance of 12 cm from its pole.

(a) Suggest the type of mirror he should use.


(b) Find the linear magnification of the image produced.


(c) How far is the image from its object?


(d) Draw ray diagram to show the image formation in this case.

 3

What is meant by homologous series of carbon compounds? Write the general formula of (i) alkenes, and (ii) alkynes. Draw the structures of the first member of each series to show the bonding between the two carbon atoms.