The function of nitrogen fixation in Anabaena (cyanobacterium) is performed by

(1) thylakoid

(2) heterocyst

(3) phycocyanin

(4) phycoerythrin

Diatoms do not decay easily because

1. they have siliceous walls

2. their body is impervious to water

3. they are chitinous

4. they are abundant in saline soil

Protists obtain their food as

(1) photosynthesizers only

(2) chemosynthesizers

(3) heterotrophs only

(4) Both (1) and (3)

Plant decomposers are

(1) Monera and Fungi

(2) Fungi and Plantae

(3) Protista and Animalia

(4) Animalia and Monera

Spirochaetes is are

(1) a class of insects

(2) a class of viruses

(3) bacteria

(4) fungi

Clamp connection is found in

(1) Basidiomycetes

(2) Ascomycetes

(3) Saccharomycetes

(4) Haplomycetes

Spirochaetes is/are

(1) a class of viruses

(2) myxobacteria

(3) spiral-shaped bacteria

(4) richittsias

The metachromatic granules are

(1) present in plants cell at metaphase stage

(2) inclusion bodies in bacteria

(3) produced in insects during metamorphosis

(4) chromatophores in animals skin

Erogotamine tartarate extracted from Claviceps, is used for cure of

(1) bodyache

(2) headache

(3) fever

(4) severe stomach pain