Question

1. Why are mitochondria and plastids called semiautonomous cell organelles ?
2. Define cytoplasm. Write its composition.
3. What are cristae? What role do they play in mitochondria?
4. When do chromosomes appear in a cell? What role do they play in it?
5. Every multicellular organism has derived from a single cell. Justify the statement
6. Give reasons for the following-
a) A de-shelled egg loses water when kept in concentrated salt solution.
b) Dry raisins swell up when kept in water,
c) A boiled Rheo leaf does not show plasmolysis when kept in strong sugar solutio
d) Golgi complex is called storage house of the cell.
e) Cell wall help the plant cell to withstand changes in the environment.
f) Plasma membrane is called selectively permeable membrane.
7. Differentiate between the following
a) Animal and plant cell.
b) Nucleus and nucleolus
c) Cell membrane and cell wall
8. Draw and explain the structure of nucleus.
​

Answer 1

please mark it as a brainlist please...

answer 1..

Because they have their own genetic material and are said to be 'semi-autonomous organelles' Chloroplast and mitochondria are called semi-autonomous organelles because they have their own genetic material (DNA) and are capable of synthesizing proteins required for their functioning.

Answer 2

Answer:

mitochondria and plastid have their own ribosome and DNA hense they can synthesise some of their own proteins and can replicate independently from the cell . Hence,mitochondria and plastids are called semi-autonomous.