Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 3

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Weekly Quiz Competition

Question 1
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What is common between wheat, maize and sunflower seeds?

A
They all are monocotyledonous seeds.

B
They all possess non-albuminous seeds.

C
They all are albuminous seeds.

D
They all contain remnant of nucellus.

Solution

Wheat, maize and sunflower seeds are albuminous. Albuminous seeds retain a part of endosperm as it is not completely used up during embryonic
Question 2
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The number of ovules in an ovary may be one or many. In which of the following plants a single ovule might be present in the ovary?

A
Paddy

B
Orchid

C
Water melon

D
Papaya

Solution

Paddy has a single ovule present in the ovary.
Question 3
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Which of the following is an aquatic plant that does not use water for pollination?

A
Vallisneria

B
Hydrilla

C
Water hyacinth

D
Zostera grass

Solution

In water hyacinth, the flowers emerge over the surface of water and are pollinated by birds, insects or wind.
Question 4
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By which kind of pollination method can assured seeds be produced even in the absence of pollinators?

A
Cleistogamy

B
Geitonogamy

C
Xenogamy

D
Both by Cleistogamy and Geitonogamy

Solution

Cleistogamy is an autogamy in which self-pollination occurs. Thus, assured seeds are produced even without pollinators by this method. Cleistogamous flowers are closed, thus, pollen grains fall on the stigma of same flower leading to fertilisation.
Question 5
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What is the ratio of antipodal cells: polar cell: synergids in embryo sac?

A
3 : 1 : 2

B
3 : 2 : 3

C
3 : 2 : 2

D
2 : 1 : 2

Solution

The ratio of antipodal cells: polar cell: synergids in embryo sac is 3 : 1 : 2. There are 3 antipodal cells, 1 polar cell which is binucleate and 2 synergids which are adjacent to the egg cell.
Question 6
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Which of the following sentences about megasporogenesis is false?

A
Megaspores are produced due to a meiotic division.

B
Megaspore mother cell is differentiated from micropylar region.

C
Eight nucleate embryo sacs are produced from 4 mitotic divisions.

D
Only six of the eight nuclei are surrounded by cell walls in embryo sac.

Solution

Eight nucleate embryo sacs are produced from 3 mitotic divisions and all the mitotic divisions are strictly free nuclear..
Question 7
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Apomixis is a phenomenon found in some grasses. What happens during apomixis?

A
Occurrence of more than one embryo in a seed

B
Development of fruits without fertilisation

C
Development of seeds without fertilisation

D
Presence of large number of seeds in a fruit

Solution

Apomixis is the process by which seeds develop without fertilisation. This takes place when the megaspore mother cell does not undergo meiosis or a cell from the nucellus develops into the embryo.
Question 8
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Pollen grains consist of 2 cells, i.e vegetative and generative. Which of the following sentences is correct about the vegetative cell?

A
It is smaller than generative cell.

B
The cell floats in the cytoplasm of generative cell

C
It does not store food.

D
The nucleus is irregularly shaped.

Solution

The nucleus of vegetative cell is large and irregularly shaped.
Question 9
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Self-incompatibility is a device to prevent in-breeding. Which of the following situations takes place during self-incompatibility?

A
Unisexual flowers are produced

B
Pollen tube growth is inhibited

C
Dys synchronisation of pollen release and stigma receptivity occurs

D
Anther and stigma are placed at different positions

Solution

Self-incompatibility is a genetic mechanism and prevents self fertilisation by inhibiting pollen germination or pollen tube growth in the pistil.
Question 10
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Intergeneric hybridization is a type of hybridization which involves crossing between two different genera of the same family. Which of the following sentence is false about intergeneric hybridization?

A
F1 hybrids are always sterile

B
Evolution of new crops is Impossible

C
It is rarely used

D
Triticale is an example of intergeneric hybridization

Solution

In Intergeneric hybridization evolution of new crops is possible. New variety has been developed by maize- tripascum cross.

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Sexual Reproduction in Flowering Plants Test - 3

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Sexual Reproduction in Flowering Plants Test - 3

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SHARING IS CARING

Question 1

They all are monocotyledonous seeds.

They all possess non-albuminous seeds.

They all are albuminous seeds.

They all contain remnant of nucellus.

Solution

Question 2

Paddy

Orchid

Water melon

Papaya

Solution

Question 3

Vallisneria

Hydrilla

Water hyacinth

Zostera grass

Solution

Question 4

Cleistogamy

Geitonogamy

Xenogamy

Both by Cleistogamy and Geitonogamy

Solution

Question 5

3 : 1 : 2

3 : 2 : 3

3 : 2 : 2

2 : 1 : 2

Solution

Question 6

Megaspores are produced due to a meiotic division.

Megaspore mother cell is differentiated from micropylar region.

Eight nucleate embryo sacs are produced from 4 mitotic divisions.

Only six of the eight nuclei are surrounded by cell walls in embryo sac.

Solution

Question 7

Occurrence of more than one embryo in a seed

Development of fruits without fertilisation

Development of seeds without fertilisation

Presence of large number of seeds in a fruit

Solution

Question 8

It is smaller than generative cell.

The cell floats in the cytoplasm of generative cell

It does not store food.

The nucleus is irregularly shaped.

Solution

Question 9

Unisexual flowers are produced

Pollen tube growth is inhibited

Dys synchronisation of pollen release and stigma receptivity occurs

Anther and stigma are placed at different positions

Solution

Question 10

F1 hybrids are always sterile

Evolution of new crops is Impossible

It is rarely used

Triticale is an example of intergeneric hybridization

Solution

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