31.

Which one of the following classesis not a representative of green-algae?

• Chlorophyceae

• Charophyceae

• Euglenophyceae

• Crysophyceae

Usually the activity of the enzymes is optimum at normal body temperature. At about 0$°$C the activity of the enzyme is

• minimum

• maximum

• Both (a) and (b)

• None of these

The term phylum was given by

• Haeckel

• Linnaeus

• Cuvier

• Theophrastus

Viral genome incorporated into host DNA is called

• prophase

• plasmid

• prophage

• bacteriophage

Given below are four methods (A to D) and their modes of action (1 to 4) in achieving contraception. Select their correct matching from the four options that follow.

• A - 3; B - 4; C - 1; D - 2

• A - 2; B - 3; C - 1; D - 4

• A - 3; B - 1; C - 4; D - 2

• A - 4; B - 1; C - 2; D - 3

The crossing of a homozygous tall pea plant and homozygous dwarf pea plant would yield plants in the ratio of

• 2 tall : 2 dwarf

• all heterozygous tall

• all homozygous dwarf

• one homozygous tall; one homozygous dwarf; two heterozygous tall

The offsprings obtained by mating two pure strains having constrasting characters are called as

• mutants

• hybrids

• F₂ - generation

• P - generation

Tectonic is the study of

• volcanoes

• sand dunes

• earthquakes

• earth's crust

Recognition sequence in Eco RI is

• GGCC

• GAATTC

• AAGCTT

• CTGCAG

During 'gene cloning', which is called 'gene taxi' ?

• Plasmid

• Protozoa

• Vaccine

• Bacterium