Botany XII - Sexual Reproduction in Flowering Plants 01

Question : 1

Identify True (T) and False (F) statements w.r.t. flower

A. These are morphological and embryological marvel and the site of sexual reproduction.

B. The decision that the plant is going to flower occurs at the time of flowering only, not before.

C. Several hormonal and structural changes are initiated which lead to the differentiation and further development of the floral primordial.

D. Flowers do not have any aesthetic and cultural value but they have ornamental, social and religious value.

Options:

	1
	2
	3
	4

Solution :

• The decision that plant is going to
flower occurs much before the actual
flower is seen on a plant.
• Flowers have aesthetic, cultural,
ornamental, social and religious
value.

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Question : 2

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In a flower, the       A         represents male reproductive organ and the       B            represents female reproductive organ.

Options:

	A-Androecium; B-Gynoecium
	A-Stamen; B-Androecium
	A-Gynoecium; B-Androecium
	A-Pistil; B-Gynoecium

Solution :

A – Androecium – male reproductive
organ.
B – Gynoecium – female reproductive
organ.

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Question : 3

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Mark the correct option w.r.t. the structure given below

i. A – Terminal and generally bilobed structure

ii. B – Long, elongated slender part beneath the stigma

iii. C – Its number and the length is variable in flowers of different species

iv. B – Its proximal end is attached to the thalamus or the petal of the flower

Options:

	ii, iii & iv
	i, ii & iii
	i, iii & iv
	I, ii, iii & iv

Solution :

A – Anther, B – Filament, C – Stamen.

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Question : 4

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The number of theca, in the each lobe of bilobed anther of a typical angiosperm is

Options:

	Two
	Four
	One
	Three

Solution :

The number of theca, in the each lobe of bilobed anther is two.

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Question : 5

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Identify the parts labelled A, B, C & D in the givendiagram

Options:

	A-Seeds, C-Line of dehiscence
	B-Pollen grains, D-Filament
	A-Ovarian cavity, D-Style
	B-Seeds, C-Fruit

Solution :

A – Pollen sacs, B – Pollen grains,
C – Line of dehiscence, D – Filament

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Question : 6

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The microsporangia

Options:

	Are usually located at the corners in each lobe
	Develop further and become pollen sacs
	Extends longitudinally all through the lengths of an anther and are packed with pollen grains
	More than one option is correct

Solution :

All are correct

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Question : 7

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Each microsporangia is surrounded by _____________ wall layers.

Options:

	Three
	Six
	Four
	Many

Solution :

Each microsporangia is surrounded by four wall layers

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Question : 8

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Mark the mismatched pair w.r.t. microsporangia given below

Options:

	A-Single layer structure and is known as exothecium in Arceuthobium
	B-Has α -cellulosic fibrous bands
	C-1-3 layer and becomes well developed with the maturity of anther
	D-Innermost layer that surrounds sporogenous tissue

Solution :

A – Epidermis, B – Endothecium,
C – Middle layers, D – Tapetum.

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Question : 9

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The cells of tapetum

(i) Nourishes the developing pollen grains

(ii) Possess dilute cytoplasm with more than one nucleus

(iii) Show increased DNA content

(iv) Provide ubisch bodies for ornamentation of intine

(v) Secrete compatibility proteins

How many statements given above are correct?

Options:

	Five
	One
	Four
	Three

Solution :

• Tapetum has dense cytoplasm
• It provides ubisch bodies for
ornamentation of exine.

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Question : 10

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In a young anther, a group of compactly arranged homogenous cells called _________ occupies center of each microsporangia.

Options:

	Pollen grains
	Sporogenous tissue
	Floral primordia
	Tapetum

Solution :

Sporogenous tissue occupies center of each microsporangia