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(A) : Parthenogenesis means the growth a...

(A) : Parthenogenesis means the growth and development of an egg without fertilization.
(R) : Most species that reproduce parthenogenetically also engage in sexual reproduction.

A

If both (A) and (R) are true and (R ) is the correct explanation of (A)

B

If both (A) and (R) are true but (R ) is not the correct explanation of (A)

C

If (A) is true but (R) is true

D

If both (A) and (R) are false.

Text Solution

Verified by Experts

The correct Answer is:
b
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A dandelion produces seeds without meiosis or fertillisation. The adult sporophyte forms diploid, rather than haploid, megaspores that develop into ovules containing diploid, rather than haploid nuclei. One of the nuclei in each ovule becomes an egg and develops directly, without fertilisation, into an embryo that is genetically identical to its parent. This type of reproduction is called

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[A] : [A]: Parthenogenesis is a type of sexual re- production. [R]: Because young ones develop without fer- tilization of egg

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  3. (A) : Parthenogenesis means the growth and development of an egg witho...

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  4. (A) : Lower plants usually reproduce by asexual means. (R) : It help...

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  6. (A) : Accessory organs of the flowers are sterile parts. (R) : They ...

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  8. (A) : Exine of pollen is chiefly made up of sporopollenin. (R): Spor...

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  9. (A) : Ovule is an integumented megasporangium . (R) It does not dehi...

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  10. (A) : Incampylotropous type the body of ovule is horseshoe shaped. (...

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  11. (A) : Cleistogamous flowers are ususally self pollinated. (R) : Thes...

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  12. (A) : All graminaceous flowers are always wing pollinated. (R) : The...

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  13. (A) : Insect visit flowers to collect honey. (R): Attraction of flow...

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  14. (A) : Mammalian ova produces an emzyme hyaluronidase. (R): This enzy...

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  15. (A) : Testes of mammals are present outside abdomnial cavity in scrota...

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  19. (A) : Cowpers glands are present in male mammals. (R) : Their secret...

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