December 3, 2015

Junior Inter Zoology Unit V - Important 4 Marks Question

Q: What are lateral appendages of flagellae? Based on their presence or absence, write various types of flagellae giving at least one example for each type.

A: a. Some types of flagellae have one or more rows of short, lateral appendages called mastigonemes and flimmers.

b. Based on the occurrence of the lateral appendages, flagellae are classified into the following five types:

1. Stichonematic: One row of lateral appendages on axoneme. Ex: Euglena

2. Pantonematic: Two or more rows of lateral appendages on
axoneme. Ex: Monax

3. Acronematic: Lateral appendages are absent. But axoneme is bare
at the tip. Ex: Polytoma

4. Pantacronematic: Axoneme has two or more rows of lateral
appendages and axoneme is bare at the tip. Ex: Urceolus

5. Anematic: Lateral appendages are absent. Axoneme is sheathed entire length. Ex: Chilomonas.

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