Lichens are important in the studies on atmospheric pollution because they

• can grow in polluted atmosphere

• can readily multiply in polluted atmosphere

• efficiently purify the atmosphere

• are very sensitive to pollutants like sulphur dioxide

Sex factor in bacteria is

• F-replicon

• chromosomal replicon

• RNA

• sex pillies

sprouting of potato can be prevented in storage by

• maleic hydrazide

• gibberellins

• indole acetic acid

• cytokinins

Embryo sac is

• microgametophyte

• microsporangium

• megagametophyte

• megasporangium

The pyramid of energy-in a forest ecosystem is

• always upright

• always inverted

• both (a) and (b)

• none of the above

The map distance between the genes A and B is 3 units, between B and C is 10 units and between C and A is 7 units. The order of the genes in a linkage map constructed on the above data would perhaps be

• A, B, C 

• A, C, B

• B, C, A

• B, A, C

In the lactose operon of Escherichia coli what is the function of promoter

• Binding of Gyrase enzyme

• Binding of RNA polymerase

• Codes for RNA polymerase

• Processing of messenger RNA

9: 3: 3: 1 ratio is modified to 9 : 7 ratio due to

• complementary gene

• epistatic gene

• hypostatic gene

• supplementary gene

Polymerase chain reaction is most useful in

• DNA synthesis

• DNA amplification

• protein synthesis

• amino acid synthesis

One of the following is sex-influenced character

• Appearance of beard

• Baldness in male

• Docile behaviour of female

• Low BMR in female