Amongst pea tendrils, Opuntia spines, lemon thorns and cucurbit tendrils, which ones are homologous structures? Give reason.

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Solution

Pea tendrils and Opuntia spines are homologous organs because they have the same origin (nodes) and are modifications of leaves but perform different functions. Lemon thorns and cucurbit tendrils are both modifications of stem and are homologous organs.

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A tendril of a pea plant and phylloclade of Opuntia are homologous.

Q. Tendrils of Vitis (grapevine) are homologous to tendrils of Cucurbits but analogous to those of pea. Justify the above statement.

Question 13
Select the correct statement

(a) Tendril of a pea plant and phylloclade of Opuntia are homologous.
(b) Tendril of a pea plant and phylloclade of Opuntia are analogous.
(c) Wings of birds and limbs of lizards are analogous.
(d) Wings of birds and wings of bat are homologous.

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. Very short answer type :
How do you consider tendrils of cucumber and thorns of Bougainvillea as homologous structures?

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