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Reproduction in Gymnosperms

Diploid egg c...

Question

Diploid egg can directly develop into embryo without fertilisation commonly in all the following plants except

A

Rubus

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B

Poa

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C

Citrus

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D

Apple

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Solution

The correct option is C Citrus
Formation of embryo directly from diploid egg without fertilisation is called diploid parthenogenesis. It can be observed in Rubus, Apple, Poa.

Two or more embryos arising in the same embryo sac commonly from nucellus is observed in Citrus. It gives rise to a condition called polyembryony.

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Similar questions

Q. A dandelion produces seeds without meiosis or fertilisation. 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 ____________________.

Q. A diploid egg, formed in embryo sac developed directly from nucellus, parthenogenetically grows into embryo. The apomixes is?

Q. Development of animal embryo from egg without fertilisation is called

Q. Reason(s) for development of apomictic seeds can be :
I. Endoreplication
II. Penetration of nucellar cells into the embryo sac
III. Formation of diploid egg cell without reduction division
IV. Fusion of gametes

Q. Read the following statements

1

2

and identify the correct one.

(1)

In bees parthenogenetic zygote develops into monoploid male

(2)

The fertilised egg develops into diploid female.

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Reproduction in Gymnosperms

Standard XII Biology

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