What is Chromatin material and how does it change just before the cell division? 2. Write two similarities and one dissimilarity between mitochondria and plastid. 3. Distinguish between cell wall and cell membrane. 4. Give reason for the following: a) Plastids are able to make their own proteins. b) Growth in plants is restricted to certain regions. c) Epidermal cells of the roots generally have hair like parts. 5. List two points of differences between parenchyma and sclerenchyma. 6. a) Voluntary muscles are also known as skeletal muscles. Justify b) Give two structural characteristics of these voluntary muscles. 7. Animals of colder region and fishes of cold water have thicker layer of subcutaneous fat. Explain why? 8. How does a cell wall help a plant to withstand hypotonic external media without bursting? 9. Write a short note on connective tissue. 10. The quantity and the quality of the food is decreasing day by day. As population is increasing drastically, mention the steps taken to improve this condition. 11. List the constituents of phloem. What will happen if the phloem at the base of a branch is removed? 12. Write a note on protective tissue in plant. 13. How do you think meristematic tissues are important for the plants? 14. Explain how the crop variety improvement is necessary and give one example (research based question) 15. What is a nervous tissue? Explain the structure of a neuron with a diagram. What functions do they perform in our body?
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When cell is in rest [not in process of division] it is called chromatin......when the division starts, it will form to Chromosome.
Similarity
1. Mitochondria and Plastid is both acquired from outside. A eukaryotic cell ate them. They live independently.
2. They both have DNA
Dissimilarity
1. They have different functions.
I m of 8th class so I can't answer most.....sorry
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