Question

Reasoning and Assertion questions:

1. Assertion: All living organisms are composed of cells and products of cells.

Reason: All cells arise from pre-existing cells. 
( a ) Assertion is correct but Reason is incorrect
( b ) Assertion is incorrect but Reason is correct
( c ) Both are correct
( d ) Both are incorrect

2. Assertion: Cell is the fundamental structural and functional unit of all living organisms.
Reason: Anything less than a complete structure of a cell does not ensure independent living. 
( a ) Both A and R are correct but R is not the correct explanation for A
( b ) A is incorrect but R is correct
( c ) Both A and R are correct & R is the correct explanation for A
( d ) A is correct but R is incorrect

3. Assertion: The shape and size of cells are related to the specific function they perform.
Reasoning: Some cells like Amoeba have changing shapes. In some cases the cell shape could be more or less fixed and peculiar for a particular type of cell 
( a ) Both A and R are correct but R is not the correct explanation for A
( b ) A is incorrect but R is correct
( c ) Both A and R are correct & R is the correct explanation for A
( d ) A is correct but R is incorrect

4. Assertion: Each kind of cell organelle performs a special function making new material in the cell, clearing up the waste material from the cell and so on.
Reasoning :Cells are found to have the same organelles, no matter what their function is. 
( a ) Both A and R are correct but R is not the correct explanation for A
( b ) A is incorrect but R is correct
( c ) Both A and R are correct & R is the correct explanation for A
( d ) A is correct but R is incorrect​

Answer 1

1 answer,a .2answer,c.3 answer,d.

4answer, b.

Answer 2

Answer:

1. (c) both the statements are correct.

2. (c) Both A & R are correct and R is the correct and appropriate explanation for A.

3. (c) Both A and R are correct & R is the correct explanation for A.

4. (a) Both A and R are correct but R is not the correct explanation for A is correct.                              

Explanation:

• 1. Schleiden and Schwann formulated the cell theory but did not explain how new cells were formed.

• Later in 1855, Rudolf Virchow first explained that cells divide and new cells are formed from pre-existing cells. (Omnis cellula-e-cellula.)

Hence (c) both the statements are correct.

• 2. Cell represents the basic, fundamental structural and functional unit of all living organisms, without which life cannot sustain.
• Any lacuna in the complete structure can not perform the cell function or ensure the independent existence of organisms. (Exception: Virus)

Hence (c) Both A & R are correct and R is the correct and appropriate explanation for A.

• 3. Contingent upon cell work the shape and size shift from one living being to another. Cells might fluctuate, circular, rectangular, polygonal, spindle-shaped and so forth. The variety in the cell is as per the job of capacity it needs to perform.

• For instance, Smooth muscle cells carry out the role of compression and relaxation. In a way, the varieties of construction of cells carry out their particular roles.

• The nerve cells are prolonged in shape and are slender and petite. An organism's cell doesn't have a cell divider. This makes it simple for it to move around the body. Also, Amoeba has changed shapes.

Hence ( c ) Both A and R are correct & R is the correct explanation for A.

• 4. Every cell in our body has structures that have specific functions called organelles. Just like organs in the body, each organelle contributes in its way to help the cell function well as a whole. The nucleus, mitochondria and chloroplasts are all organelles.

• Organelles are found in eukaryotic cells. Some organelles like endoplasmic reticulum, mitochondria, Golgi apparatus etc are found in all eukaryotic cells but exceptions include chloroplasts in plant cells and centrioles present in animal cells.

Hence ( a ) Both A and R are correct but R is not the correct explanation for A is correct.

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