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CBSE Notes 2011-2012 » X-Science-Term2

How Do Organisms Reproduce ?

A : Ultimate cause of variations among living beings is alteration in DNA sequence in the genes. B :...

Multiple choice question

A : Ultimate cause of variations among living beings is
alteration in DNA sequence in the genes.
B : Number of chromosomes in gametes is equal to the
chromosomes in parental cells.

Which of the following is a primary sex organ in a mammal ?

Multiple choice question

Which of the following is a primary sex organ in a
mammal ?

A : Tissue culture is the most modern method of vegetative propagation. B : The ovules formed in ova...

Multiple choice question

A : Tissue culture is the most modern method of
vegetative propagation.
B : The ovules formed in ovary change into seeds.

The ability to reproduce is lost in a female afte

Multiple choice question

The ability to reproduce is lost in a female afte

Assertion (A) : Fertilised egg gets implanted on the lining of uterus and start dividing. Reason (R)...

Multiple choice question

Assertion (A) : Fertilised egg gets implanted on the
lining of uterus and start dividing.
Reason (R) : During menstruation, the uterus lining
breaks and comes out through vagina
as blood and mucous.

When a sperm is deposited into the vagina which route does it travel ?

Multiple choice question

When a sperm is deposited into the vagina which route
does it travel ?

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