The organs P and Q of two animals have different structures but similar functions. On the other hand, the two organs R and S of two other animals have the same basic structure but different functions.
(a) What are the organs like P and Q known as
(b) Name the organs like P and Q. Also name the animals which have such organs.
(c) What are the organs like R and S called?
(d) Name the organs like R and S. Also name the animals which have such organs.

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Solution

(a) Organs P and Q are known as analogous organs.

(b) Wings of an insect and a bird are like P and Q.

(c) Organs R and S are called homologous organs.

(d) Forelimbs of humans and wings of birds are like R and S.

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Similar questions

Q. Study following statements and choose the correct alternative.
(P) Those organs which have the same internal structure but different functions, are called homologous organs.
(Q) Organs which have different basic design but have similar appearance and carry out similar functions are called analogous organs.
(R) The impressions of dead plants or animals that lived in the past are known fossils.

P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.

(a) What is (i) R, and (ii) S?

(b) What is the name of growth movement exhibited by the organs R and S?

(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.

(e) Name one plant like P and another plant like Q.

The species P and Q of wild animals are found exclusively in a 'particular area'. The species R of wild animals is listed in Red data book of India whereas species S of wild animals no longer exists anywhere on the earth.
(a) What name is given to species like P and Q?
(b) What are the species like R known as?
(c) Name one species like R.
(d) What is the special name of species like S?
(e) Name one species like S.

Q. The organs which have the same basic structure and developmental origin but have different functions are:

Q. Organs structures which are different in appearance and perform different functions but have similar basic structures are developmental origin

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(a) Organs P and Q are known as analogous organs. (b) Wings of an insect and a bird are like P and Q. (c) Organs R and S are called homologous organs. (d) Forelimbs of humans and wings of birds are like R and S.

(a) Organs P and Q are known as analogous organs.

(b) Wings of an insect and a bird are like P and Q.

(c) Organs R and S are called homologous organs.

(d) Forelimbs of humans and wings of birds are like R and S.