Biology
Assertion (A): Meristematic tissues consist of undifferentiated, actively dividing cells.
Reason (R): Meristems are undifferentiated as they divide and redivide and produce a large number of cells. They are not specialized for any particular function.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Tissues
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Answer
Both A and R are true and R is the correct explanation of A.
Reason — A is true as meristematic tissue consists of undifferentiated cells that actively divide to produce new cells for plant growth.
R is true as meristematic cells are called undifferentiated because they continuously divide and redivide, forming a large number of new cells. They do not specialize into a particular function.
The continuous division and lack of specialization is exactly why meristematic tissues are undifferentiated and actively dividing.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
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The non-cellular part of blood is :
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The tissue in which the cells are filled with fat globules is :
- Epithelial tissue
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Assertion (A): Permanent tissues form the bulk of the plant body and they do not divide.
Reason (R): Permanent tissues mature into fixed, specialised cells that carry out specific functions, so they no longer retain the ability to divide.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
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Assertion (A): All organisms, whether unicellular or multicellular, start their life from a single celled structure called the zygote.
Reason (R): Zygote is formed by the fusion of two unicellular structures (gametes) during the process of fertilization among higher plants and animals.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.