Chloromycetin is obtained from

• Streptomyces venezuelae

• Streptomyces rimosus

• Bacillus subtilis

• Clostridium botulinum

Which is Indian dwarf wheat?

• T. dicoccum

• T. sphaerococcum

• T. turgidum

• T. aestivum

Mutualism is found in

• hermit crab and sea anemone

• ox pecker and rhinoceros

• zoochlorellae and Hydra

• E.coli and man

During formation of which of the following free nuclear division occurs?

• Flower

• Endosperm

• Gametes

• Fruit

The sphere of living matter together with water, air and soil on the surface of earth is called

• atmosphere

• hydrosphere

• lithosphere

• biosphere

An oocyte is released from the ovary under the influence of LH 

• after completing meiosis and before polar bodies are released

• after completing meiosis I and before release of polar bodies

• after completing meiosis

• after completing meiosis I and after release of polar bodies.

Assertion : Watson and Crick provided experimental proof of semiconservative nature of DNA replication.

Reason : DNA polymerase binds nucleotides in replication.

• If both Assertion and Reason are true and Reason is the correct explantion of Assertion

• If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false

• If Assertion is false but Reason is true.

Which of the following pesticides is an acetylcholinesterase inhibitor?

• Aldrin

• BHC

• Endosulfan

• Malathion

Extranuclear genes occurs in

• plastids and are not inherited

• plasmid and are not inherited

• mitochondria and are inherited by female

• mitochondria and are inherited by male

In prokaryotes, genetic recombination can occur during

• transduction

• transformation

• conjugation

• all of these