Q. Which of the following is/are correctly matched?

1. Cyclostomata- jawless vertebrates.
2. Pisces- Streamlined body
3. Amphibia- four chambered heart
4. Aves- warm-blooded

Select the correct answer from the codes given below:
Answer: Only 1, 2, and 4
Notes: Cyclostomes are jawless vertebrates. They are characterised by having an elongated eel-like body, circular mouth, slimy skin and are scaleless. Pisces are fish. They are exclusively aquatic animals. Their skin is covered with scales/ plates. They obtain oxygen dissolved in water by using gills. The body is streamlined, and a muscular tail is used for movement. Amphibia differ from the fish in the lack of scales, in having mucus glands in the skin, and a three-chambered heart. Respiration is through either gills or lungs. They lay eggs. These animals are found both in water and on land. Aves are warm-blooded animals and have a four-chambered heart. They lay eggs. There is an outside covering of feathers, and two fore-limbs are modified for flight. They breathe through lungs.

This question is part of UPSC Daily 20 MCQ Series Course on GKToday Android app.