At maturity, the female gametophyte in angiosperms has:
I:
Three cells grouped together at the micropylar end constituting the egg apparatus
II:
Three cells are at the chalazal end and are called the antipodals
1.
Only I is correct
2.
Only II is correct
3.
Both I and II are correct
4.
Both I and II are incorrect
Subtopic: Â Pistil: Ovule |Â Pistil: Female Gametophyte |
 88%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Consider the two statements:
| Statement I: | Cleistogamous flowers are invariably autogamous. |
| Statement II: | Chasmogamous flowers can never be autogamous. |
| 1. | Statement I is correct; Statement II is correct |
| 2. | Statement I is correct; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is incorrect; Statement II is incorrect |
Subtopic: Â Pollination & Outbreeding Devices |
 81%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Cells of which of the following wall layer of microsporangium possess dense cytoplasm and generally have more than one nucleus?
1. epidermis
2. endothecium
3. middle layers
4. tapetum
1. epidermis
2. endothecium
3. middle layers
4. tapetum
Subtopic: Â Stamen: Anther |Â Stamen: Microsporangium |
 90%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
During the formation of the embryo sac in angiosperms, cell walls are laid:
| 1. | from the first nuclear division |
| 2. | between the 2-nucleate and 4-nucleate stage |
| 3. | before the 8-nucleate stage |
| 4. | after the 8-nucleate stage |
Subtopic: Â Pistil: Female Gametophyte |
 72%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
The pollen intine is:
| 1. | a thin and continuous layer made up of cellulose and pectin. |
| 2. | a thick and discontinuous layer made up of cellulose and pectin. |
| 3. | made up of sporopollenin and is a continuous layer. |
| 4. | made up of sporopollenin and has prominent apertures called germ pores. |
Subtopic: Â Stamen: Anther |Â Stamen: Male Gametophyte |
 92%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
How many of the given statements are correct:
1. 2
2. 3
3. 4
4. 5
| I: | Endosperm development precedes embryo development. |
| II: | The coconut water from tender coconut is cellular endosperm. |
| III: | The white kernel in coconut is free nuclear endosperm. |
| IV: | Endosperm is completely consumed by the developing embryo in pea. |
| V: | Endosperm persists in the mature seed of castor. |
2. 3
3. 4
4. 5
Subtopic: Â Endosperm |
 66%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Study the given figure and select the correct statements:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. |
| II: | In 40 per cent of angiosperms, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage). |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Â Stamen: Microsporangium |Â Stamen: Male Gametophyte |
 92%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
In the female gametophyte of angiosperms, filiform apparatus is a part of:
1. Synergids
2. Antipodals
3. Central cell
4. Egg
1. Synergids
2. Antipodals
3. Central cell
4. Egg
Subtopic: Â Pistil: Ovule |Â Pistil: Female Gametophyte |
 94%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
All the following plants are pollinated by water except:
1. Vallisneria
2. Hydrilla
3. Zostera
4. Eicchornia
1. Vallisneria
2. Hydrilla
3. Zostera
4. Eicchornia
Subtopic: Â Pollination & Outbreeding Devices |
 79%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
In angiosperms, the pollen tub, carrying male gametes, enters into the embryo sac through the:
1. chalaza
2. nucellus
3. micropyle
4. funiculus
1. chalaza
2. nucellus
3. micropyle
4. funiculus
Subtopic: Â Pollen - Pistil Interaction |
 91%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
© 2024 GoodEd Technologies Pvt. Ltd.