Structure of Microsporangium

Q. Assertion: Tapetal cells usually possess dense cytoplasm and never more than one nucleus.
Reason: Tapetal cells undergo mitosis which generally involves division of nucleus but cytokinesis does not happen.

1. Both assertion and reason are correct and the reason is the correct explanation to the assertion
2. Both assertion and reason are correct but the reason is an incorrect explanation to the assertion
3. Only assertion is correct
4. Only reason is correct

Q.

What is heterospory? Briefly comment on its significance. Give two examples.

Q. Find the odd one out with respect to ploidy of the cells.

1. Pollen mother cells
2. None of the above
3. Tapetum
4. Endothecium

Q. The chromosome number in a root cell of a plant X is 30. What would be the chromosome number in the cell of (i) endothecium, (ii) primary sporogenous cells of microsporangium, (iii) microspore?

1. i-30, ii-30, iii-30
2. i-30, ii-30, iii-15
3. i-30, ii-15, iii-15
4. i-15, ii-15, iii-15

Q.

Exine of the pollen grain is made up of

1. Pectocellulose

2. Ligno cellulose

3. Sporopollenin

4. Pollen kit

Q. Read the following statements and find out the incorrect statement.

a. The number and length of stamens is variable in flowers of the same species.

b. A typical angiosperm anther is bilobed, with each lobe having two theca.

c. Often a longitudinal groove runs lengthwise separating the theca.

d. The anther consists of four microsporangia located at the corners one in each lobe.

e. The microsporangia develop further and become pollen sacs. They extend longitudinally all through the length of an anther and are packed with pollen grains.

1. a and b only
2. a and d only
3. b, c and e
4. a, c and d

Q.

What is the significance of heterospory?

Q. Innermost layer of anther wall:
[0.7 mark]

1. Is called endothecium
2. Generally has binucleated cells
3. Performs the function of protection
4. Helps in dehiscence of anther

Q. Choose the correct sequence of layers surrounding the microsporangium in angiosperms.

1. Tapetum - epidermis - middle layers - endothecium .
2. Epidermis - middle layers - endothecium - tapetum.
3. Endothecium - middle layers - tapetum- epidermis.
4. Epidermis - endothecium - middle layers - tapetum.

Q. Arrange the layers of angiospermic microsporangium wall from outside to inside.

1. Epidermis, middle layers, endothecium, tapetum
2. Epidermis, endothecium, middle layers, tapetum
3. None of the above
4. Epidermis, tapetum, middle layers, endothecium

Q. Microsporangia in anther directly develops into ______i________ while microspores develop into ______ii_______.

1. i-embryo sac, ii-pollen grains
2. i-pollen grains, ii-pollen sacs
3. i-male gametophytes, ii-embryo sacs
4. i-pollen sacs, ii-male gametophytes

Q. What is incorrect for generative cell?

1. Floats in cytoplasm of vegetative cell
2. Spindle-shaped
3. Having abundant food reserve
4. Has dense cytoplasm and a nucleus

Q.

Which of the following anther wall layers is short-lived?

1. Epidermis

2. Tapetum

3. Middle layers

4. Endothecium

Q. Which of the following is not a part of anther in angiosperms?

1. Endothecium
2. Tapetum
3. Epidermis
4. Embryo sac

Q. Match the labels with their correct description in the given diagram of microsporangium showing different layers of its wall.

1. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Endothecium}& \text{Innermost wall layer}\\ \text{R}& \text{Microspore mother cells}& \text{Forms microsporess}\\ \text{S}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{T}& \text{Tapetum}& \text{Nourishes the developing pollen grains}\end{array}$
2. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Endothecium}& \text{Protective layer}\\ \text{R}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{S}& \text{Microspore mother cells}& \text{Forms microspore}\\ \text{T}& \text{Tapetum}& \text{Innermost layer of the wall}\end{array}$
3. $\begin{array}{ccc}\text{Label}& \text{Name}& \text{Description}\\ \text{P}& \text{Epidermis}& \text{Outermost, protective}\\ \text{Q}& \text{Tapetum}& \text{Nourishes the pollen grains}\\ \text{R}& \text{Middle layers}& \text{Help in dehiscence of anther}\\ \text{S}& \text{Microspore mother cells}& \text{Forms microspore}\\ \text{T}& \text{Endothecium}& \text{Innermost layer of the wall}\end{array}$
4. None of the above

Q. The given diagram refers to a T. S. of anther. Identify A to E respectively

1. Sporogenous tissue, tapetum, epidermis, middle layer, endothecium

2. Sporogenous tissue, epidermis, tapetum, middle layer, endothecium

3. Sporogenous tissue, epidermis, middle layer, tapetum, endothecium

4. Sporogenous tissue, tapetum, middle layer, epidermis, endothecium

Q.

Which of the following anther wall layers is short-lived?

1. Epidermis

2. Tapetum

3. Endothecium

4. Middle fibrous layers

Q. Match the following:
$\begin{array}{cc}\text{i. Endothecium}& \text{1. Microsporophyll in angiosperm}\\ \text{ii. Tapetum}& \text{2. Protective layer in microsporangia}\\ \text{iii. Sporogenous tissue}& \text{3. Nourishes male gametophyte}\\ \text{iv. Stamen}& \text{4. Develops microspores}\end{array}$

1. i-2, ii-3, iii-4, iv-1
2. i-4, ii-1, iii-3, iv-2
3. i-3, ii-4, iii-2, iv-1
4. i-2, ii-1, iii-4, iv-3

Q. Which of the following is found at the centre of a young anther?

1. Endothecium
2. Tapetum
3. Sporogenous tissue
4. None of the above

Q.

What lead to formation of syncytium?

Q. Which of the following is found at the centre of a young anther?

1. Tapetum
2. Endothecium
3. Sporogenous tissue
4. None of the above

Q.

Are conidia haploid or diploid?

Q. Identify A to E in the following diagram.

1. A - Tapetum, B - Microspore mother cell, C - Middle layers, D - Endothecium, E - Epidermis
2. A - Epidermis, B - Middle layers, C - Microspore mother cell, D - Tapetum, E - Endothecium
3. A - Middle layers, B - Epidermis, C - Tapetum, D - Microspore mother cell, E - Endothecium
4. A - Epidermis, B - Endothecium, C - Middle layers, D - Microspore mother cell, E - Tapetum

Q. Match the column 1 with column 2 and choose the correct option.
$\begin{array}{cc}\text{Column 1}& \text{Column 2}\\ \text{p. Endothecium}& \text{1. Nourishes the developing pollen}\\ \text{q. Tapetum}& \text{2. Cannot be degraded by any enzyme}\\ \text{r. Pollen mother cell (PMC)}& \text{3. Protection of microsporangium}\\ \text{s. Sporopollenin}& \text{4. Forms microspores}\end{array}$

1. p-2, q-4, r-1, s-3
2. p-3, q- 2, r-1, s-4
3. p-4, q-3, r- 2, s-1
4. p-3, q- 1, r-4, s-2

Q.

Match the following.

$\begin{array}{cc}Column-I& Column-II\\ \left(i\right).Epidermis& \left(a\right).Nutritivelayer\\ \left(ii\right).Endothecium& \left(b\right).Dehiscenceofanther\\ \left(iii\right).Tapetum& \left(c\right).Protectivelayer\\ \left(iv\right).Middlelayers& \left(d\right).Short-livedlayer\end{array}$

1. (i) - (c), (ii) - (b), (iii) - (d), (iv) - (a)

2. (i) - (a), (ii) - (b), (iii) - (c), (iv) - (d)

3. (i) - (d), (ii) -(c), (iii) - (b), (iv) - (a)

4. (i) - (c), (ii) - (b), (iii) - (a), (iv) - (d)

Q. In an embryosac, the cells that degenerate after fertilization are

1. Synergids, Primary endosperm nucleus
2. Synergids, antipodals
3. Antipodals, Primary Endosperm Cell
4. Egg, Antipodals

Q. Identify the parts labelled from A to E in the following diagram.

1. A - Cotyledons, B - Hypocotyl, C - Plumule, D - Root cap, E -Radicle
2. A - Radicle, B - Root cap, C - Plumule, D - Hypocotyl, E - Cotyledons
3. A - Hypocotyl, B - Cotyledons, C - Plumule, D - Radicle, E - Root cap
4. A - Plumule, B - Cotyledons, C - Hypocotyl, D - Radicle, E - Root cap

Q. The female gametophyte in angiosperm represents

1. embryo sac
2. nucellus
3. stigma
4. perisperm

Q. If the root of a diploid angiospermic plant has 42 chromosomes, find out the chromosome number in its synergid.

1. 7
2. 14
3. 21
4. 28

Q. Which of the following is not a part of anther in angiosperms?

1. Endothecium
2. Tapetum
3. Epidermis
4. Embryo sac