Which one of the following is not true?

Primary sexual characters are present from birth

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Primary and Secondary sexual characters differentiates humans into sexually dimorphic species

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Secondary sexual characters are not directly related to production of gametes

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Secondary sexual characters includes the ovaries and penis

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Solution

The correct option is D
Secondary sexual characters includes the ovaries and penis

Primary sexual characteristics are present from birth and are directly concerned with reproduction and allow the differentiation of males and females. The ovary in females and testis in males are primary sexual characteristics. Secondary sexual characteristics like pubic hair, enlargement of breast appear during puberty due to the hormones released during this time. Primary and secondary sexual characteristics differentiate males and females in a sexually dimorphic species. Sexual dimorphism is the difference in appearance between males and females of the same species. Secondary sexual characteristics are not concerned with reproduction or production of gametes.

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Question 4
Offsprings which are formed by the asexual reproduction methods have greater similarity among themselves because

(i) Asexual reproduction involves only one parent
(ii) Asexual reproduction does not involve two gametes
(iii) Asexual reproduction occurs before sexual reproduction
(iv) Asexual reproduction occurs after sexual reproduction

(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (iii) and (iv)

Question 4
Offsprings which are formed by the asexual reproduction methods have greater similarity among themselves because

The offsprings formed by asexual reproduction method have greater similarity among themselves because:
(i) asexual reproduction involves only one parent
(ii) asexual reproduction involves two parents
(iii) asexual reproduction involves gametes
(iv) asexual reproduction does not involve gametes
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iv)
(d) (i) and (iv)

Q. New individuals formed by asexual method of reproduction have greater similarity among themselves because:
(i) Asexual reproduction involves only one parent.
(ii) Asexual reproduction does not involve gametes.
(iii) Asexual reproduction occurs before sexual reproduction.
(iv) Asexual reproduction occurs after sexual reproduction.

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