Biology
Assertion (A): Meiosis is the kind of cell-division which occurs during gamete formation in the gonads.
Reason (R): During meiosis, chromosome number remains the same in parent cell and daughter cells which is very significant to maintain the identity of the organism.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.
Chromosomes
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Answer
A is True and R is False.
Explanation
During meiosis, chromosome number is halved. During fertilisation, two haploid gametes/cells fuse to restore normal chromosome count.
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Assertion (A): The basic structural unit of DNA is nucleotide.
Reason (R): DNA is composed of repeating nucleosome which are made up of three components - pentose sugar, phosphate group and nitrogenous bases.
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Assertion (A): Centrosome is the point of attachment of two chromatids of a chromosome.
Reason (R): Centrosome initiates and regulates the process of cell division as it helps in the formation of spindle fibres.
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Assertion (A): Heredity is the basic fundamental unit of Genetics.
Reason (R): Genes carry hereditary information from the offsprings to their parents.
- Both A and R are True
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Assertion (A): Karyotype is the division of nucleus during cell-division.
Reason (R): Karyon means nucleus and type explains the number, shape and size of the chromosome.
- Both A and R are True
- Both A and R are False
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- A is False and R is True.