Which of the following statements is true regarding reproduction in phaeophyceae?

Vegetative reproduction takes place by fragmentation.

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Asexual reproduction in most brown algae is by non-flagellated zoospores.

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Zoospores are pear-shaped and have two unequal laterally attached flagella.

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Sexual reproduction may be isogamous, anisogamous or oogamous.

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Solution

The correct options are
A Vegetative reproduction takes place by fragmentation.
C Zoospores are pear-shaped and have two unequal laterally attached flagella.
D Sexual reproduction may be isogamous, anisogamous or oogamous.
The members of phaeophyceae or brown algae are found primarily in marine habitats. Vegetative reproduction takes place by fragmentation. Asexual reproduction in most brown algae is by biflagellate zoospores that are pear-shaped and have two unequal laterally attached flagella. Sexual reproduction may be isogamous, anisogamous or oogamous. Union of gametes may take place in water or within the oogonium (oogamous species). The gametes are pyriform (pear-shaped) and bear
two laterally attached flagella.

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Q. Pick the option which includes all the correct statements from the following.

A. Chlorophyceae: Chlorophyll a and chlorophyll c pigments, starch-stored as food, asexual reproduction by zoospores.

B. Phaeophyceae: Fucoxanthin pigment, mannitol-stored as food, pear-shaped zoospores with 2, unequal sized apical flagella.

C. Rhodophyceae: Phycoerythrin pigment, floridean starch, reproduction by non-motile spore.

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Q. Study the following figures and select the correct statements regarding these.
(i) A shows mode of asexual reproduction in sponges through internal buds.
(ii) B shows sexual reproduction through zoospores in Chlamydomonas.
(iii) C shows asexual reproduction through conidiospores in Penicillium.
(iv) D shows external budding in Sycon.

Q. What is isogamous, anisogamous and oogamous reproduction?

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