Megasporogenesis

Q.

Differentiate between microsporogenesis and megasporogenesis. Which type of cell division occurs during these events? Name the structure formed at the end of these two events.

Q.

How megaspore mother cell is formed?

Q. Match column-I containing types of aestivation with their examples given in column-II and choose the correct option.
$\begin{array}{cccc}& \text{Column-I}& & \text{Column-II}\\ & \text{(Type of aestivation)}& & \text{(Examples)}\\ \text{A.}& \text{Valvate}& \text{I.}& \text{Cotton}\\ \text{B.}& \text{Twisted}& \text{II.}& \text{Calotropis}\\ \text{C.}& \text{Imbricate}& \text{III.}& \text{Bean}\\ \text{D.}& \text{Vexillary}& \text{IV.}& \text{Gulmohur}\end{array}$

1. A – I; B – II; C – IV; D – III
2. A – II; B – IV; C – I; D – III
3. A – II; B – I; C – IV; D – III
4. A – II; B – I; C – III; D – IV

Q. In a flower, if a megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be

1. triploid
2. haploid
3. a few haploid and few diploid
4. diploid

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 microspore and megaspore 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. Kranz anatomy is not exhibited by which of the following plants ?

1. Sugarcane
2. Sunflower
3. Sorghum
4. Maize

Q.

Blastopore is the pore of

1. blastocoel

2. archenteron

3. alimentary canal

4. coelom

Q.

What is the ploidy of a functional megaspore?

1. $2\mathrm{n}$

2. $\mathrm{n}$

3. $4\mathrm{n}$

4. None of these

Q. A bisexual flower gives rise to 150 MMC and 250 PMC in a single season. How many mature embryo sacs and pollen grains will be formed by it over 10 seasons?

1. 1500 embryo sacs, 10000 pollen grains
2. 6000 embryo sacs, 2500 pollen grains
3. 1500 embryo sacs, 2500 pollen grains
4. 6000 embryo sacs, 10000 pollen grains

Q.
Pollen tubes releases the two male gametes into:

1. 
   Cytoplasm of central cell
2. 
   Cytoplasm of egg cell
3. 
   Cavity of embryo
4. 
   Cytoplasm of synergid

Q. Placenta and pericarp are both edible portions in

1. apple
2. banana
3. tomato
4. potato

Q. Which type of placentation is seen in sweet pea?

1. Marginal
2. Basal
3. Axile
4. Free central

Q.

Does rose have a superior ovary?

Q.

Are Basidiospores haploid or diploid?

Q. The above floral diagram shows the floral formula

1. 
2. 
3. 
4. 

Q. How many of the daughter cells obtained from a megaspore mother cell develops into a female gametophyte?

1. Four
2. Three
3. Two
4. One

Q.

An incomplete flower with only gynoecium is called a

1. pistillate flower

2. staminate flower

3. hermaphrodite flower

4. bisexual flower

Q. The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilisation is called:

1. Vegetative propagation
2. Sexual reproduction.
3. Apomixis
4. Parthenocarpy

Q. Name the phenomenon of two flowers, one having long stamens and short styles, and other having short stamens and long style :

1. Allogamy
2. Dicliny
3. Heterostyly
4. Herkogamy

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

Q.

Define pistillate flower.

Q. With the help of a neat and labelled diagram describe the development of female gametophyte of angiosperms.

Q. Describe the development of female gametophyte in Angiosperms.

Q. Formation of diploid embryo sac from diploid vegetative structure, e.g., nucellus or integument etc., without meiosis is called

1. apospory
2. apomixis
3. diplospory
4. polyembryony

Q. What is meant by the monosporic development of female gametophyte? Explain the development of female gametophyte with well-labelled diagrams.

Q.

what will be the ploidy of cells of the nucellus, MMC ( Microspore Mother Cell ) , functional megaspore, and female gametophyte ??

Q.

How one can reproduce a plant that has lost the ability to produce seeds?

Q. Explain the development of female gametophyte in angiosperm by well labelled diagram only.

Q. Assertion :Megaspore mother cell undergoes meiosis to produce four megaspores. Reason: Megaspore mother cells and megaspores both are haploid.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q.

Define Zygote.