Structure of Microsporangium

Q.

What is a nucleoid? Explain shortly.

Q.

What is ploidy level of primary endosperm nucleus?

Q. Endothecium is responsible for ______________ of pollen grains.
i) nutrition
ii) protection
iii) dehiscence

1. i
2. i & ii
3. ii & iii
4. ii

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

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

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

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. 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. Microsporangia or ______i________ in anther contains microspores that develop into ______ii_______.

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

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

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

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.

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. Endothecium is responsible for ______________ of pollen grains.
i) nutrition
ii) protection
iii) dehiscence

1. i
2. i & ii
3. ii & iii
4. ii

Q.

Identify the correct statements with respect to an anther.

1. An anther is always bilobed.

2. Anther lobe with one theca is called dithecous.

3. The bilobed nature of anther is distinct in its longitudinal section.

4. A typical anther is tetragonal and tetrasporangiate.

Q.

The position of tapetum in the anther wall is

1. Inner to endothecium

2. Outer to middle layers

3. Inner to middle layers

4. Inner to epidermis