Question

Read the following term carefully: -
Pyrenoids, Algin, Carrageen, Mannitol, Starch, Polysiphonia, Dictyota, Fucus, Pear shaped Zoospore, Oogamous, Volvox,
Chlorophyll 'd', Fucoxanthin, holdfast How many terms are related with brown algae?
(A) 10
(B) 12
(C) 9
(D) 8​

Answer 1

Answer:

Option C is right.

The 9 terms related to brown algae are

• Algin

• Mannitol

• Laminarian starch

• Dictyota

• Fucus

• Pear shaped zoospore

• Oogamous

• Fucoxanthin

• Holdfast

Explanation:

BROWN ALGAE:

• The order of Phaeophyceae consists of brown algae.

• They contain chlorophyll a , chlorophyll c , xanthophyll and carotenoid.

• The brown pigment associated with xanthophyll is fucoxanthin.

• Dictyota and fucus are the examples of brown algae.

• The food prepared by brown algae is laminarian starch which is also called mannitol.

• The cell wall is surrounded by a layer of mucus hydrocolloid called algin .

• The asexual gamete of brown algae consists of pear shaped zoospore. They have two flagella.

• The type of sexual reproduction in fucus is oogamous, which produces two different gametes.

• Some members of brown algae have holdfast , stipe and fonds.

OTHER OPTIONS:

• Pyrenoids are the food product of chlorophyceae or green algae.

• Carrageen is the hydrocolloid present in rhodophyceae or red algae.

• Polysiphonia is an example of red algae.

• Volvox is an example of green algae.

• Chlorophyll d is associated with red algae.