Select the animal that exhibits retrogressive metamorphosis

• Bufo

• Limulus

• Amphioxus

• Herdmania

182.

Assertion: The nymph of a cockroach undergoes moulting several times.

Reason: There is gradual metamorphosis in cockroach.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

Assertion: Branchiostoma and Balanoglossus are bilaterally symmetrical and triploblastic animals.

Reason: They are exclusively marine and possess notochord.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

Assertion: Cephalisation is advantageous to an animal.

Reason: It improves the appearance of the animal.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

Assertion: Blood in cockroach is colourless haemolymph with no respiratory pigment.

Reason: Respiration in cockroach occurs through diffusion in haemolymph.

• If both assertion and reason are true and reason is the correct explanation of assertion. 

• If both assertion and reason are true but reason is not the correct explanation of assertion. 

• If assertion is true but reason is false. 

• If both assertion and reason are false.

Assertion : In Pleurobrachia, eight comb like ciliary plates called comb plates are present on the body that help in locomotion.

Reason : Pleurobrachia reproduces sexually and its life cycle includes cydippid larva.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Stinging capsules (nematocysts) are found in

• wasp and honeybee

• scorpion and cobra

• sea pen and sea fan

• cactus and Venus flytrap

Choose the correct pair

• Coconut, cucurbits - dioecious

• Honeybee, Rotifers - parthenogenesis

• Ornithorhyncus, Whale - viviparity

• Frog, Peacock - external fertilisation

Select the incorrect statement.

• Periplaneta has compound eyes.

• Earthworm shows segmentation.

• Ascaris shows sexual dimorphism.

• Liver fluke has a complete alimentary canal

Refer the given figure of digestive system of earthworm and identify the part labelled X.

• Intestinal caecae

• Typhlosole

• Gizzard

• Pharynx.