Botany XII - Sexual Reproduction in Flowering Plants 05

Question : 1

Read the following four statements (a-d) :
a. Pollination does not guarantee the transfer of the right type of pollen
b. In plants, which shed pollen the two–celled condition, pollen tubes carry the two sperms from the beginning
c. Artificial hybridisation is one of the major approaches of crop improvement programme
d. If the female parent produces unisexual flowers, there is no need for bagging
How many of the above statement is/are right?

Options:

	2
	3
	4
	1

Solution :

(A)

(b) When pollen shed in the 3-celled
condition.
(d) There is no need for emasculation in
this condition

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Question : 2

(skipped)

In Mangifera indica, syngamy and triple fusion take place in
 

Options:

	Nucellus
	Ovary wall
	Embryo sac
	Endosperm

Solution :

(C)

Embryo sac is the site of double
fertilization.

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Question : 3

(skipped)

What will be ploidy level of endosperm and embryo if the cross is made between 4n plant and 2n  plant?
 

Options:

	3n, 2n
	5n, 3n
	2n, 3n
	3n, 5n

Solution :

(B)

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Question : 4

(skipped)

After entering in embryo sac, the pollen tube releases the male gametes into the
 

Options:

	Nucleoplasm of the synergid
	Micropylar side of oosphere
	Chalazal side of female gamete
	Cytoplasm of the synergid

Solution :

(D)

After entering one of the synergids, the
pollen tube releases the two male
gametes into the cytoplasm of the
synergid.

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Question : 5

(skipped)

Read the following statement having two blanks (A & B) :

“The (A) after triple fusion becomes primary endosperm cell while the zygote develops into a/an (B) .

” The one correct option for the two blanks is
 

Options:

	(A) Antipodal cell,     (B)  Suspensor
	(A) Central cell,       (B)  Embryo
	(A) Central cell,        (B)  Endosperm
	(A) Oosphere,          (B)  Proembryo

Solution :

(2)

Polar nuclei are present in central cell.

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Question : 6

(skipped)

Pollen grain germinates on stigma to produce pollen tube through
 

Options:

	One of the micropyle
	Both of the integuments
	One of the germ pores
	Both of the spermoderms

Solution :

(C)

In most of the plants, pollen grains are
monosiphonous.

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Question : 7

(skipped)

In which of the following plants, triple fusion occurs?
 

Options:

	Tobacco, Rose, Selaginella
	Peepal, Cotton, Eucalyptus
	Banana, Lemon, Pinus
	Coriander, Papaya, Cycas

Solution :

(B)

• Double fertilization (syngamy + triple
fusion) is an event unique to flowering
plants.
• Selaginella = Pteridophyte
• Pinus, Cycas = Gymnosperms

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Question : 8

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Pollen recognition by stigma followed by promotion or inhibition of the pollen is called
 

Options:

	Pollination
	Incompatibility
	Trophomixis
	Pollen-pistil interaction

Solution :

(D)

Pollen-pistil interaction is a dynamic
process.

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Question : 9

(skipped)

In artificial hybridisation it is important to make sure that only the desired pollen grains are used for pollination and the stigma is protected from contamination. This is achieved by
 

Options:

	Emasculation
	Tagging
	Bagging
	More than one option is correct

Solution :

(D)

Both (1) & (3) are correct.

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Question : 10

(skipped)

Examine the figure given below and select the right option giving all the two parts (a, b) correctly identified

                       

Options:

	(a) Vegetative nucleus,     (b)    Synergid
	(a) Male gamete,             (b)   Nucleus of synergid
	(a) Sperm,                       (b)     Vacuole of synergid
	(a) Male gamete,              (b)     Nucleus of egg cell

Solution :

(B)

• Male gamete/sperm.
• Synergids possess a micropylar
nucleus and a chalazal vacuole