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(a) “The female gametophyte of an angiosperm is a seven celled, eight nuclei containing structure."Justify.

Monjur Alahi

(a) “The female gametophyte of an angiosperm is a seven celled, eight nuclei containing structure."Justify.
(b) Explain double fertilization in angiosperms.


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Salim Ahmed Kawsar

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(a) Eight nuclei in mature Embryo sac
- Three cell form an egg apparatus , consisting of one egg cell and two synergids 
- Three cells at chalazal end called antipodals 
- A large central cell with two polar nuclei
(b) After entering a synergid, pollen releases two male gametes into the cytoplasm 
- one male gamete fuses with egg nucleus and completes syngamy resulting in zygote 
- other male gamete fuses with the two polar nuclei located in the central cell to produce a triploid primary endosperm nucleus this is called triple fusion 
- since two types of fusions take place ---> double fertilisastion 

                                                                   

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In which kingdom will you place an organism which is single-celled, eukaryotic and photosynthetic?

Plant Kingdom

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Correct Option: A  Internal fertilization occurs inside female body

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Name the parts of an angiosperm flower in which development of male and female gametophyte take place.

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What is meant by monosporic development of female gametophyte?

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One vegetative cell and two male gametes

1 Answers 1 views
The generative cell of a 2-celled pollen divides in the pollen tube but not in a 3-celled pollen. Give reasons.

In a 3-celled pollen, the generative cell has already divided and formed 2male gametes. Hence, it will not divide again in the pollen tube. Since ina 2-celled pollen, the generative...

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Statement-1 : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.

(a) : Statement-1 states that energy is released when heavy nuclei undergo fission and light nuclei undergo fusion is correct. Statement-2 is wrong The binding energy per nucleon, B/A, starts at...

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From the statements given below choose the option that are true for a typical female gametophyte of a flowering plant:

The correct answer is (c) i & ii

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