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Q. No.Pollen grains retain viability for months in plants belonging to different families given below :
(i) Solanaceae
(ii) Leguminosae
(iii) Gramineae
(iv) Rosaceae
(v) Liliaceae
The correct option is :
1. (i), (ii) and (v)
2. (i), (ii) and (iv)
3. (ii), (iv) and (v)
4. (i), (iii) and (v)
Subtopic: Stamen: Male Gametophyte |
86%
From NCERT
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In the transverse section of a young anther shown below, identify the correct sequence of wall layers from outside to inside:
| (i) | (ii) | (iii) | (iv) | |
| 1 | Middle layers | Endothecium | Epidermis | Tapetum |
| 2 | Tapetum | Middle layers | Endothecium | Epidermis |
| 3 | Epidermis | Endothecium | Middle layers | Tapetum |
| 4 | Endothecium | Middle layers | Tapetum | Epidermis |
Subtopic: Stamen: Anther | Stamen: Microsporangium |
74%
From NCERT
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Floral reward's provided by insect pollinated flowers to sustain animal visit is/are :
1. Nectar and fragrance
2. Nectar and pollen grains
3. Pollen grains and fragrance
4. Fragrance and bright colour
1. Nectar and fragrance
2. Nectar and pollen grains
3. Pollen grains and fragrance
4. Fragrance and bright colour
Subtopic: Pollination & Outbreeding Devices |
81%
From NCERT
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Which condition of gynoecium (pistil) is shown the figures (i) and (ii)?
| 1. | (i) | Multicarpellary apocarpous | (ii) | Multicarpellary syncarpous |
| 2. | (i) | multicarpellary syncarpous | (ii) | Multicarpellary apocarpous |
| 3. | (i) | Bicarpellary apocarpous | (ii) | Bicarpellary syncarpous |
| 4. | (i) | Bicarpellary syncarpous | (ii) | Bicarpellary apocarpous |
Subtopic: Pistil: Female Gametophyte |
84%
From NCERT
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Choose the correct labellings for the parts X, Y and in Z in the given figure of the stages in embryo
development in a dicot:
1. X is suspensor, Y is radicle and Z is cotyledon.
2. X is radicle, Y is cotyledon and Z is suspensor.
3. X is cotyledon, Y is suspensor and Z is radicle.
4. X is zygote, Y is radicle and Z is cotyledon.
development in a dicot:
1. X is suspensor, Y is radicle and Z is cotyledon.
2. X is radicle, Y is cotyledon and Z is suspensor.
3. X is cotyledon, Y is suspensor and Z is radicle.
4. X is zygote, Y is radicle and Z is cotyledon.
Subtopic: Double Fertilization |
86%
From NCERT
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Which of the following outbreeding devices are used by majority of flowering plants to prevent inbreeding depression?
(i) Pollen release and stigma receptivity are not synchronised.
(ii) Different positions of anther and stigma.
(iii) Production of different types of pollen grains.
(iv) Formation of unisexual flowers along with bisexual flowers.
(v) Preventing self-pollen from fertilising the ovules by inhibiting pollen germination.
1. (i), (ii) and (v)
2. (ii), (iii) and (v)
3. (i), (iii) and (v)
4. (iii), (iv) and (v)
(i) Pollen release and stigma receptivity are not synchronised.
(ii) Different positions of anther and stigma.
(iii) Production of different types of pollen grains.
(iv) Formation of unisexual flowers along with bisexual flowers.
(v) Preventing self-pollen from fertilising the ovules by inhibiting pollen germination.
1. (i), (ii) and (v)
2. (ii), (iii) and (v)
3. (i), (iii) and (v)
4. (iii), (iv) and (v)
Subtopic: Pollination & Outbreeding Devices |
79%
From NCERT
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What is common between the two species shown in the figures?
1. Both are angiosperms.
2. Both are gymnosperm.
3. Both are chasmogamous flowers.
4. Both (1) and (3)
1. Both are angiosperms.
2. Both are gymnosperm.
3. Both are chasmogamous flowers.
4. Both (1) and (3)
Subtopic: Pollination & Outbreeding Devices |
66%
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If a wrong type of pollen or pollen from a different species lands on the stigma, which of these is not formed?
1. egg cell
2. embryo
3. embryo sac
4. all of the above will be formed
1. egg cell
2. embryo
3. embryo sac
4. all of the above will be formed
Subtopic: Pollen - Pistil Interaction |
55%
From NCERT
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A student researching an artificial crop improvement project in wheat growing in a certain field saw that wheat plants were covered with bags made up of butter paper.
What is the purpose of covering these plants with butter paper bags?
1. to reduce transpiration.
2. to reduce photosynthesis.
3. to hide the identity of the plants.
4. to prevent unwanted pollination.
What is the purpose of covering these plants with butter paper bags?
1. to reduce transpiration.
2. to reduce photosynthesis.
3. to hide the identity of the plants.
4. to prevent unwanted pollination.
Subtopic: Pollen - Pistil Interaction |
91%
From NCERT
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| Assertion (A): | Apomictic embryos are generally identical to the parent plant. |
| Reason (R): | Apomixis is the production of seeds without fertilisation. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Apomixis & Polyembryony |
65%
From NCERT
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