Question

1. What are chromosomes made up of?
2. Who coined the term ‘Cell’
3. Name two structures, which are found in plant cell, but not in animal cell.
4. Name the process in which diffusion takes place through a semipermeable
membrane.
5. Name the energy currency of cell.
6. What are dictyosomes?
7.How is a bacterial cell different from plant cell?
8.Why is the cell called the structural and functional unit of life?
9.Why is the plasma membrane called a selectively permeable membrane?
10.Explain in detail what do you know about the structure of nucleus.
11. Describe the phenomenon of membrane biogenesis. Give one function of ER.
12.Which organelle is known as the powerhouse of the cell? Why?
4) a) Name the cell organelles which are called ‘suicide bags’ and power-house of
the cell. Why are they so called? Give reason.
b) Draw a neat labelled diagram of ‘Animal cell.

Answer 1

Answer:

1. Chromosomes are made up of chromatin fibres.

2. Robert Hooke coined the term cell.

3. Plastids and Cell wall are not found in animal cells.

5. ATP ( Adenosine Triphosphate)

6. Golgi bodies in plant cells are called dictyosomes.

8. Cell is called the structural unit of life because it is the smallest unit of life.

Cell is called the functional unite of life because it can perform it's living functions on it's own.

9. Because plasma membrane allows only certain substances to enter or exist the cell.

10. Nucleus consists of a nuclear membrane with fine nuclear pores on it. Inside the nucleus membrane, there is a nucleolus which contains the genetic material called chromatin fibres; there is also a semi solid substance outside the nucleolus called nucleoplasm.

12. Mitochondria is called the powerhouse of cell because it is the site where cell respiration occurs to release energy in the form of ATP.

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Answer 2

Answer:

1.cromatin net, nucleic acid

3.plastid,cell wall

5. ATP

6. sentrosome is made up of two dictyosomes

2. Robert Hooke

8.cell is called the structural and functional unit of life because,lot of cells which can do same works make tissue, lot of tissue which can do same work make organ,lot of organ which are in same work make system,and some system can make life....so in this way we can say our body is made up of cell

12. mitochondria

because it is responsible to make energy from food by cellular respiration..

4.a lysosome is called suicide bags because it has hydrolytic enzymes and if any thing happened wrong in cell then it can destroy the whole cell