Nucleic acid is absent in

• Virus

• Viroid

• Prion

• Mycoplasma

Which part of an animal virus is not reproduced in multiple copies?

• Capsid

• Protein

• Envelope

• Ribosome

Entamoeba histolytica differs from Amoeba in absence of 

• pseudopodia

• contractile vacuole

• nucleus

• ectoplasm

Most primitive member, in which roots are not present, is

• Psilotum

• Rhynia

• Lycopodium

• Selaginella

The process which cannot take place in the absence of viruses is

• transformation

• conjugation

• translocation

• transduction

In Whittaker's system of classification, prokaryotes belong to the kingdom

• Monera

• Protista

• Animalia

• Fungi

Thigmotaxis is not shown by

• Paramecium

• Amoeba

• Ascaris

• Hydra

Polyp phase is absent in

• Hydra

• Aurelia

• Physalia

• Obelia

Contractile vacuole in protozoan Amoeba is meant for

• respiration

• excretion

• locomotion

• osmoregulation

Edible part of mushroom is

• basidiocarp

• secondary mycelium

• primary mycelium

• tertiary mycelium