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

(1) thylakoid

(2) heterocyst

(3) phycocyanin

(4) phycoerythrin

Plant decomposers are

(1) Monera and Fungi

(2) Fungi and Plantae

(3) Protista and Animalia

(4) Animalia and Monera

These organisms are fungus like in one phase of their life cycle and Amoeba like in another phase of their life cycle

(1) diatoms

(2) slime molds

(3) dinoflagellates

(4) water molds

In which of the following patterns of viral replication, viruses enter a cell, replicate and then cause the cell to burst, releasing new viruses?

(1) Lytic

(2) Lysogenic

(3) Reprogenic

(4) Both (1) and (2)

The role of contractile vacuole in protista is

(1) Osmoregulation

(2) Digestion

(3) Locomotion

(4) Reproduction

The correct sequence of increasing radii is - 

1. The biological classification was attempted instinctively
a. to make scientific studies easy
b. to use organisms for our own use
c. to make better understanding of the research running in all over the world
d. to make connection between living and non-living

The first attempt for Biological classification was because of the need to use organisms for our own use. Here which kind of uses are considered?

First time the scientific basis for classification was attempted by -

Which of the following statement is not incorrect with respect to biological classification attempted by Aristotle?