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For the formation of tetrasporic embryosac, how many megaspore mother cells are required

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Important Questions on Sexual Reproduction in Flowering Plants

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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 27
Megasporangium is equivalent to
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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 28

Examine the figure given below shows the entry of the pollen tube into the embryo sac. Identify A, B, C, D, E, and, F respectively

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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 29
Collar like outgrowth arising from the base of ovule and forming a sort of third integument is known as
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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 30
Filiform apparatus is found in which part of angiosperms
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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 31
An orthotropous ovule is one in which the micropyle and chalaza are
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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 32

The ovule in the pea is:

Or

The ovule of Capsella is:

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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 33

The given figure shows megasporogenesis and development of typical female gametophyte in angiosperms. Which of the following options is right in which all divisions (D1 to D5)
And structure (S) are correctly identified:

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NTA Errorless Biology Volume-2>Chapter 2 - Sexual Reproduction in Flowering Plants>Ordinary Thinking>Q 34
In an embryo sac of a typical angiosperm, there are