Predators cannot perform

1. conduit for energy transfer

2. control prey species

3. make the ecosystem stable

4. Keep a check on diversity of species

Monarch Butterfly

1. has biochemical defense mechanism
2. acquires biochemical defense mechanism during its caterpillar stage by feeding on poisonous weed
3. is highly distasteful to predator Zebra
4. both 1 and 2

Acacia and Cactus show which kind of defenses?

1. Biochemical

2. Biomolecular

3. Morphological

4. Behavioural

As a mechanism of defense against herbivory, Calotropis:

(1) Has large number of thorns

(2) Secretes cardiac glycosides

(3) Produces a neurotoxin, strychnine

(4) Releases a hallucinogen

The invasiveness of prickly pear cactus in Australia was controlled by introducing a predator from its natural habitat and this predator was

1. A ladybird

2. A moth

3. A wasp

4. A desert fly

In a field experiment, when all Pisaster starfish were removed from an enclosed intertidal area, the result was:

1. Increase in diversity of invertebrates

2. Extinction of many invertebrate species

3. Inability of the Pisaster to enter the area again

4. Replacement of Pisaster by other starfish

Calotropis doesn't allow any cows and goats to browse around by releasing

1. Cardiac glucosamine

2. Cardiac glucoside

3. Cardiac glycoside

4. Cardiac nitroxide

Which of the following is not a function of predators?

Monarch butterfly escapes from predators by

(1) foul smell                     

(2) bitter taste

(3) colour combination         

(4) rough skin

The prickly pear cactus introduced in Australia in the 1920s got famous because of the lack of which population interaction?

1. Competition

2. Predation

3. Parasitism

4. Amensalism