Question

1. Which cell organelle is the key to the life of the cell ?
2. How do you say that a cell also has a life span and death like an organism ? Give one example,
3 . All organisms excrete. Does an individual cell also do it? Give one example,
4. Every organism needs food. Does a cell also need it? Explain very briefly.​

Answer 1

Answer:

1. The nucleus is the cell organelle which is key to the life of a cell. The cell nucleus is a membrane-bound structure even it also contains the cell's genes and controls the cell's growth and reproduction.

2. Every organism which is born should end its life at some period, so are the cells. They have specific life span and they die at the end of their life span. For example, a red blood cell (RBC) is produced in the bone marrow. It has an average lifespan at about 120 days.

3. Yes, single cell also excretes. For example, Amoeba excretes excess water and wastes by simple diffusion through cell membrane. They have a contractile vacuole that helps in excretion and osmoregulation.

4. All the cells whether single-celled organisms or the cells in our bodies, need energy to survive. The cells get this energy from the food, they take in the form of glucose etc. They use this to perform different functions like keeping their organelles functional or helping the organism to perform different functions like movement, digestion etc.