Question

The unpaired fin in fish helps in
a) pushing b) propelling
The openings at the sides of the body of insects are called
a) spiracles b) trachea c) air tube
An animal which breathes through moist skin is
a) amoeba b) frog c) earthworm d) oockroach
The mouth part of a butterfly is called
a) proboscis b) tube c) needle
Frogs have​

Answer 1

Answer:

1. a) pushing

2. a) spiracles

3. c) earthworm

4. a) proboscis

Answer 2

Answers

1. Answer - a)
Explanation - Of the unpaired fins, the caudal fin is well developed in most fishes because it plays the most important role in forward propulsion during swimming. The caudal fin in most of the fishes is highly developed with few exceptions like Hippocampus and some of the eels.

2. Answer - b) or c) (choose any one)
Explanation - Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system, a densely networked array of tubes called tracheae.

3. Answer - c)
Explanation - Earthworms and amphibians have a skin which is permeable to gases. Earthworms do not have lungs and breathe only through their skin but most amphibians breathe through both skin and lungs. So, our first option is earthworm. Earthworms do not have lungs.

4. Answer - a)
Explanation - The butterflies are the typical example of the siphoning mouthparts, which deals with only sucking. They lack mandibles with the remaining mouthparts forming an elongated sucking tube, the proboscis. The proboscis is a long tube that is formed by heavily modified maxillae, specifically, the galea.

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