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Biological Classification

Multiple Choice Questions

151.

The oldest fossil belongs to which of the following group of plants/ animals?

Asteriodae
Rhodophyceae
Blue- green algae
Phaeophyceae

152.

In Amoeba hyaline cap is formed by

around the food vacuole
around the contractile vacuole
around the nucleus
on pseudopodia

153.

The cell wall of fungi is formed by

chitin and mannose
cellulose
glucose
None of the above

154.

The chief advantage of encystment of an Amoeba is

protection from parasites and predators
the chance to get rid of accumulated waste products
the ability to survive during adverse physical conditions
the ability to live for sometime without ingesting food

155.
Powdery mildew of crops are caused by

bacteria

Ascomycetes

Basidiomycetes

Phycomycetes

Ascomycetes

Mildew diseases are caused by a group of fungal parasites called Ascomycetes. It is of two types powdery mildew and downy mildew.

Powdery mildews are caused by external parasites which grow superficially on the leaves, green stems and fruits and form powdery or dusty patches which are filled with white conidia. Downy mildews are caused by internal obligate parasites which are characterised by downy growth.