Question

Differentiate between the following :-

(i) red algae and brown algae

(ii) iverwort and moss

(iii) homosporous and heterospous pteridophyte

(iv) syngamy and triple fusion
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Answer 1

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(i) Red algae :-

• Red algae are grouped under the class Rhodophyceae.
• They contain floridean starch as stored food.
• They contain the photosynthetic pigments chlorophylls a and d and phycoerythrin.

Brown algae :-

• Brown algae are grouped under the class Phaeophyceae.
• They contain mannitol or laminarin as a stored food.
• They contain the photosynthetic pigments chlorophylls a and c and fucoxanthin.

(ii) liverworts :-

• They have unicellular rhizoids.
• Scales are present very often.
• They are generally thalloid, with dichotomous branching.

Moss :-

• They have multicellular rhizoids.
• Scales are absent.
• They are foliage, with lateral branching.

(iii) Homosporous :-

• They bear spores that are of the same type.
• They produce bisexual gametophytes.

Heterospous :-

• They bears two kinds of spores - microspores and megaspores, differing in size.
• They produce unisexual gametophytes.

(iv) syngamy :-

• It is the process of fusion of the Male gamete with the egg in an angiosperm.
• A diploid zygote is formed as a result of syngamy.

Triple fusion :-

• It is the process of fusion of the Male gamete with the diploid secondary nucleus in an angiosperms.
• A triploid primary endosperm is formed as a result of triple fusion.

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