Cartilaginious fishes have
I. Scoroll valve `" "` II. Operculum
III. Placoid scale`" "` IV. Cycloid or ctenoid scales
Choose the correct option.

Match the columns I, II and III. Choose the correct option.

Match the columns I, II and III. Choose the correct option.

Classes of mandibulate are I. Crustacea " " II. Merostomata III. Insecta " " IV. Arachnida Choose the correct option

Heterothallism is found in I. Rhizopus II. Mucor III. Puccinia gaminis IV. None of these Choose the correct option .

Which of the following is used for flavouring cheese ? I. Penicillium camemberti II. Aspergillus niger III. Penicillium roqueforti IV. Mucor Choose the correct option .

The conditions necessary for vernalisation are I. high temperature II. Low temperature III. Carbon dioxide IV. oxygen and water Choose the correct option.

Mendelism was rediscovered by I. Morgan II. De Vries III. Correns IV. Tschermak Choose the correct option

Teredo is I.commonly known as shipworm II.destructive to wood in seawater III.a living fossil IV.commonly called as sea mouse Choose the correct option .