Megasporogenesis

Q.

Megaspores are produced from the megaspore mother cells after

1. Formation of thick wall

2. Mitotic division

3. Meiotic division

4. Differentiation

Q. In angiosperms, functional megaspore develops into

1. Embryo sac
2. Ovule
3. Ovary
4. None of the above

Q. What is monosporic development?

1. The method of formation of megaspores from a single megaspore mother cell.
2. The method of formation of single seed from a single ovule.
3. The method of formation of an embryo sac from a single megaspore
4. The method of formation of microspores from a single pollen mother cell

Q. Which of the following features are true for Pinus?

1. Haploid endosperm
2. Bicilliated sperms
3. Double fertilization
4. Presence of antheridia

Q. Match and find the correct combination.

	$I$		$II$
$\left(a\right)$	Gracilaria	$\left(i\right)$	Biflagellate spores
$\left(b\right)$	Ectocarpus	$\left(ii\right)$	Elaters
$\left(c\right)$	Marchantia	$\left(iii\right)$	Biflagellate antherozoids
$\left(d\right)$	Cycas	$\left(iv\right)$	Carpogonium
		$\left(v\right)$	Multiciliated male gametes

1. $\left(a\right)-\left(iv\right),\left(b\right)-\left(v\right),\left(c\right)-\left(ii\right),\left(d\right)-\left(i\right)$
2. $\left(a\right)-\left(i\right),\left(b\right)-\left(iv\right),\left(c\right)-\left(iii\right),\left(d\right)-\left(v\right)$
3. $\left(a\right)-\left(iv\right),\left(b\right)-\left(i\right),\left(c\right)-\left(ii\right),\left(d\right)-\left(v\right)$
4. $\left(a\right)-\left(iv\right),\left(b\right)-\left(ii\right),\left(c\right)-\left(iii\right),\left(d\right)-\left(i\right)$

Q. Which of the following is not true about microsporogenesis and megasporogenesis?

I) All the cells in the microspore and megaspore tetrad give rise to microspores and megaspores respectively.
II) Both the processes involve meiotic division.
III) One of them occurs in the ovule and the other occurs in the megasporangium.
IV) One of them results in the formation of mature embryo sac and the other results in the formation of pollen grains.

1. Only I and III are not true
2. Only III is not true
3. I, III & IV are not true
4. I and II are not true

Q.

Identify the correct sequence of cells formed during embryo sac development.

1. Megaspore mother cell - Megaspore tetrad - Embryo Sac- Nucellus

2. Megaspore mother cell - Megaspore tetrad - Functional megaspore - Embryo Sac

3. Sporogenous cell - Megaspore tetrad- Megaspore mother cell - Embryo Sac

4. Nucellus - Sporogenous cell - Embryo Sac - Megaspore-Megaspore mother cell

Q.

Which of the following is the meiocyte in the ovule?

1. Pollen mother cell

2. Sporogenous cell

3. Megaspore mother cell

4. Archesporial cell

Q.

All four megaspores in the ovule are functional. True or false?

1. True

2. False

Q. If an ovary has 50 ovules, the number of non-functional megaspores formed in the ovary is:

1. 100
2. 150
3. 200
4. 50