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(I) In Volvox, sexual reproduction involves the fusion of one large, static male gamete and a smaller motile female gamete.
(II) In Spirogyra, fusing gametes are non-flagellated and dissimilar in size.
(III) In Ulothrix, fusing gametes are flagellated and similar in size.
(IV) In Fucus, the female gamete is large and non-motile whereas male gamete is small and motile.
Options:
(I) In Volvox, sexual reproduction involves the fusion of one large, static male gamete and a smaller motile female gamete.
(II) In Spirogyra, fusing gametes are non-flagellated and dissimilar in size.
(III) In Ulothrix, fusing gametes are flagellated and similar in size.
(IV) In Fucus, the female gamete is large and non-motile whereas male gamete is small and motile.
Solution:
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The correct answer is:
III, IV
Algae are the simplest plant group showing a thalloid and autotropism. These group mainly found in water follow various methods of reproduction: sexual, asexual, vegetative. Volvox is a type of colonial algae that follows sexual reproduction. The female gamete in it is large and static whereas the male one is motile and smaller than female gamete. Similar pattern is observed in Fucus. Spirogyra, commonly called the water silk is a type of green algae is called so due to presence of spiral chloroplasts. Spirogyra also, reproduces sexually by fusion of similar sized gametes which donot have any flagella. They are not motile.
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