18. How is prokaryotic cell different from eukaryotic cell?
19. Write three points of difference between amphibians and reptiles.
20. Draw a chart showing animal classification.
21. Explain uniform motion with example.
22. Write the measures to maintain personal health and community health.
Answers
Explanation:
ques 18). Prokaryotes are organisms that consist of a single prokaryotic cell. Eukaryotic cells are found in plants, animals, fungi, and protists. They range from 10–100 μm in diameter, and their DNA is contained within a membrane-bound nucleus. Eukaryotes are organisms containing eukaryotic cells.
ques 19). Amphibians are organisms that live a dual life. They can live on land as well as in water. They have a porous skin that requires moisture. Also, amphibians lay eggs in the water, and their young have gills to survive in the water. They venture onto land only when fully mature.
Reptiles, on the other hand, have adapted to live completely on dry land. They are viviparous and breathe through lungs. They have scales on their body that help to retain moisture and protects them against predators.