Different colours of frog skin are controlled by:

• hormones

• melanocytes

• nervous system

• both 'a' and 'c'

Passive food ingestion in Amoeba is known as :

• import

• invagination

• circumfluence

• circumvallation

Ecdysone is secreted from:

• insecta

• trematoda

• nematoda

• polycheta

The group of anamniota includes:

• reptiles and birds

• birds and mammals

• fishes and amphibians

• reptiles, and mammals

The slime moulds are characterized by the presence of :

• elaters

• pseudoelaters

• capillitium

• capitulum

Blastula of frog has :

• blastopore

• blastocoel

• arahenteron

• gastropore

Which of the following enzyme digest protein in stomach?

• Trypsin

• Pepsin

• Crepsin

• None of these

The excretory material of bony fish is:

• urea

• protein

• ammonia

• amino acid

Haemocoel is found in :

• Hydra and Aurelia

• Taenia and Ascaris

• cockroach and Pila

• Balanoglossus and Herdmania

The enzyme, which combines with non-protein part to form a functional enzyme known as :

• co-enzyme

• holoenzyme

• apoenzyme

• prosthetic group