Red tide of sea is due to presence of

• Gonyaulax

• Cymbella

• chlamydae

• blue-green algae

Which one of the following is a bacteria?

• Pseudomonas

• Clostridium

• Actinomycetes

• Azotobacter

Consider the following statements about basis of classification.

I. Amphibians are classified on the basis of their habitat.

II. Reptiles are classified on the basis of the nature of their skulls.

III. Birds are classified on the basis of their bones.

IV. Mammals are classified on the basis of their mode of reproduction.

Choose the correct option

• Only I

• I and II

• Only II

• II and IV

In biosystematics, the basis of classification is

• major morphological characters

• cytological characters

• evolutionary history considering various parameters from different fields of studies

• phenotypic relationships between species

The protein that reproduce within the living cells are termed as

• plasmids

• phages

• prions

• prophages

206.

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

• Asteriodae

• Rhodophyceae

• Blue- green algae

• Phaeophyceae

In Amoeba hyaline cap is formed by

• around the food vacuole

• around the contractile vacuole

• around the nucleus

• on pseudopodia

The cell wall of fungi is formed by

• chitin and mannose

• cellulose

• glucose

• None of the above

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

Powdery mildew of crops are caused by

• bacteria

• Ascomycetes

• Basidiomycetes

• Phycomycetes