Question

Read the following statements about cockroach a) The nymph grows by moulting about 13 times to reach the adult form
b) The next to last nymphal stage has wing pads
c) On an average a female cockroach produces 9-10 ootheca, each containing 14-16 eggs
d) Both compound eyes show 2000 ommatidia 1) a and b are true, cand d are false
2) a and d are true, b and care false
3) a, b and c are true, d is false
4) b, c and d are true, a is false​

Answer 1

Answer:

Answer

C

Solution

The numph grows by mounting about 7-8 times to reach adult form

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Answer 2

The correct option is- 3) a, b and c are true, d is false.

• In P. americana, the adult cockroach is formed after the development through nymphal stage. The nymphs are similar to adult cockroaches. They moult thirteen times before reaching the adult stage.
• Before the last nymphal stage, wing pads are formed but they do not have wings.
• Cockroaches have compound eyes that are surrounded by a transparent cuticle. Each eye is made up of 2,000 ommatidia. Thus, both eyes consist of 4,000 ommatidia.