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Vestigial Organs

Are thorns of...

Question

Are thorns of carissa and duranta homologous or analogous organs? Explain.

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Solution

Thorns of Carissa and thorns of Duranta are analogous organs as they have different origin but perform same function. In Carissa, thorns are modified terminal buds whereas in Duranta they are modified axillary buds.

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Q. Are the thorns of Bougainvillea and tendrils of Cucurbita homologous or analogous ? Which type of evolution has brought such a similarity in them?

Q. Identify the following pairs as homologous or analogous organs.
(i) Sweet potato and potato
(ii) Eye of octopus and eye of mammals
(iii) Thorns of Bougainvillaea and tendrils of Cucurbits
(iv) Fore limbs of bat and whale

Q. Study the different conclusions drawn by students of a class on the basis of observations of preserved/available specimens of plants and animals.
I. Potato and sweet potato are analogous organs in plants.
II. Wings of insects and wings of birds are homologous organs in animals.
III. Wings of insects and wings of bats are analogous organs in animals.
IV. Thorns of citrus and tendrils of Cucurbita are analogous organs in plants.
The correct conclusions are

Q. (a) Explain the terms 'analogous organs' and 'homologous organs' with examples.
(b) In what way are analogous organs evidence for evolution?

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