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Cell : The Unit of Life

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Distinguish between cilia and flagella.

Cilia

Flagella

1. They are 2-10nm in length.

2. They are hair-like.

3. Their number per cell is relatively large.

4. They usually cover the entire exposed surface of the cell.

5. They beat in co-ordinated manner.

6. They exhibit sweeping or rowing motion.

7. The ciliary locomotion is fast.

1. They reach a length upto 150nm.

2. They are whip like.

3. Their number per cell is relatively small, usually 1-4.

4. They are present at one end only.

5. They beat independently.

6. They show undulating motion.

7. The flagellar locomotion is slow.

 

Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?

Mathias Schleiden.

Who reported that the cell had an outer layer which is known as plasma membrane today?

Theodore Schwann 

 What are receptor molecules ?

Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell. When such chemical signals bind to a receptor, they cause some form of cellular response. 

What is the function of contractile vacuole in amoeba?

Excretion.

State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not.