Botany XII - Sexual Reproduction in Flowering Plants 02

Question : 1

In the anther, the cells of the sporogenous tissue undergo        A          division to form         B          .

Options:

	A-Meiotic; B-Pollen dyad
	A-Meiotic; B-Microspore tetrad
	A-Mitotic; B-Pollen grains
	A-Two successive mitotic divisions; B-Microspore tetrad

Solution :

Sprogenous cells undergo meiotic
divisions.
After meiosis a microspore tetrad is
formed.

You scored 0 of 1

Question : 2

(skipped)

What will be the ploidy and the chromosome number in a pollen tetrad of a plant with the chromosome number 40 in its root cell?

Options:

	n; 20
	2n; 40
	n; 10
	2n; 20

Solution :

• Ploidy of pollen tetrad is –n.
• Therefore the number of
chromosomes in the pollen tetrad
is = 20.

You scored 0 of 1

Question : 3

(skipped)

The process of formation of microspores from pollen mother cells is known as

Options:

	Microgametogenesis
	Megagametogenesis
	Microsporogenesis
	Megasporogenesis

Solution :

Microsporogenesis is the process of
formation of microspores from pollen
mother cell

You scored 0 of 1

Question : 4

(skipped)

How many meiotic divisions are required to produce 160 pollens in a typical flower?

Options:

	160
	100
	80
	40

Solution :

You scored 0 of 1

Question : 5

(skipped)

Microspores develop into pollen grains by

Options:

	Dehydration and association
	Dehydration and dissociation
	Hydration and dissociation
	Hydration and association

Solution :

Dehydration and dissociation.

You scored 0 of 1

Question : 6

(skipped)

Isobilateral tetrad of microspores

A. Is formed when each karyokinesis is followed by cytokinesis

B. Is very common in dicots

C. Have four or more than four pollen

Options:

	A
	A & B
	B & C
	A & C

Solution :

Isobilateral tetrad is present in monocots and contains 4 pollen/microspore per tetrad.

You scored 0 of 1

Question : 7

(skipped)

All five types of tetrad are present in

Options:

	Butomopsis
	Halophila
	Magnolia
	Aristolochia elegans

Solution :

Aristolochia elegans has all four types of tetrad.

You scored 0 of 1

Question : 8

(skipped)

Translator apparatus of Calotropis consists of

A. Stigma

B. Corpusculum

C. Caudicle

D. Pollinium

E. Style

Options:

	B, C & D
	A, B & D
	C, D & E
	A, B, C & D

Solution :

Translator apparatus in Calotropis consists of – Corpusculum + Caudicle + Pollinium.

You scored 0 of 1

Question : 9

(skipped)

Match the columns

Options:

	a(i), b(ii), c(iii), d(iv)
	a(i), b(iii), c(iv), d(ii)
	a(ii), b(iv), c(i), d(iii)
	a(ii), b(i), c(iv), d(iii)

Solution :

• Cyperaceae – One MMC (2n)
produces only one microspore as rest
degenerate.
• Cuscuta reflexa – Polyspory i.e.,
presence of more than 4 pollen in a
tetrad.
• Orchidaceae – Pollinium.
• Drosera – Compound pollens i.e.,
pollen remain in tetrad and are not
separated.

You scored 0 of 1

Question : 10

(skipped)

Options:

	Development of microspores
	Dehiscence of anther
	Anther wall layers
	Microsporangium showing wall layers

Solution :

Dehiscence of anther.