Question

1.
2.
3
c Change one word to make the sentence true.
1. Cel was discovered by Robert Brown. Moske
2. cells similar in structure and function form an
organ.
sierraneable
3. The cell membrane is permeable.
4 cell wall is the outermost layer of an animal plant
cell.
5. The smallest cell in the human body is the nerve
cell.​

Answer 1

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Change one word to make sentence true:

1) Cell was discovered by Robert Brown.

✏Cell was discovered by Robert Hooke.

✳Robert hooke was the first to observe the dead cells in the bark of tree. They were small rooms resembling honeycomb like structures. He write his observation sin his book, Micrographia.

2) Cells similar in structure and function form an organ.

✏ Cells similar in structure and function from a tissue.

✳The tissues are group of cells similar in origin and function, working as a unit. Several tissues includes Bone, Blood, Muscle tissue, Cardiac tissue etc.

3) The Cell membrane is permeable.

✏ The Cell membrane is selectively-permeable.

✳The Cell membrane only allows solvents and some solute selectively to pass through it. It is made up of phospolipids and proteins.

Or.....

3) The cell membrane is permeable.

✏ The cell wall is permeable.

✳The cell wall is the outer most covering of plant cell which provides a definite shape and turgidity to the cell. It is made up of cellulose.

4) Cell wall is the outermost layer of an animal cell.

✏ Cell wall is the outermost layer of plant cell.

✳I have given a short information about cell wall in the previous question i.e. Q.3)

5) The smallest cell in the human body is the nerve cell.

✏The longest cell in the human body is the nerve cell.

✳The nerve cells can extend upto 1 m, the longest nerve cells are generally found in the limbs. This is for the fast flow of Electrical impulses.

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Answer 2

Answer:

1. Cell was discovered by Robert hook.
2. cells similar in structural and functional unit for forming an organ.
3. The cell membrane is selectively permeable.
4. cell wall is the outermost layer of an animal and plant cell.
5. The smallest cell in the human body is the sperm cell.

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