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Question

Fill up the missing words in relation with thorax in cockroach :

The Fore wings in roaches are called________(i)________. They are opaque, dark and leathery and cover the_______(ii)_____ when at rest. The hind wings are _______(iii)________, membranous and are used in _____(iv)____.



A

(i) Flight,(ii) Tegmina or Elytra,(iii) Hind wings,(iv) Transparent

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B

(i) Tegmina or Elytra,(ii) Hind wings,(iii) Transparent,(iv) Flight

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C

(i) Transparent,(ii) Flight,(iii) Tegmina or Elytra,(iv) Hind wings.

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D

(i) Hind wings,(ii) Transparent,(iii) Flight,(iv) Tegmina or Elytra.

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Solution

The correct option is D

(i) Tegmina or Elytra,(ii) Hind wings,(iii) Transparent,(iv) Flight


The body of the cockroach is divisible into head, thorax and abdomen.
The cockroach has three pairs of jointed appendages and two pairs of wings.
The fore wings are mesothoracic and are called wing covers or tegmina or elytra. They cover the hindwings and are protective in function. These are dark stiff opaque and leathery.
The hind wings are large, thin, membranous and transparent. They are kept folded below the tegmina and are used for flying.

Answer:The Forewings are called tegmina or elytra. They are opaque, dark and leathery and cover the hind wings when at rest. The hind wings are transparent, membranous and are used in flight.

Biology

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