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Q. No.The central cell of the female gametophytes in angiosperms:
1.
results in the formation of a diploid cell after double fertilisation.
2.
has three haploid nuclei
3.
after triple fusion becomes the primary endosperm cell (PEC) and develops into the endosperm.
4.
after syngamy develops into an embryo
Subtopic: Double Fertilization |
95%
From NCERT
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In the given diagram of corn plant, tassels are represented by the alphabet:
| 1. | A | 2. | B |
| 3. | C | 4. | D |
Subtopic: Pollination & Outbreeding Devices |
From NCERT
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Endosperm is completely consumed by the developing embryo before seed maturation in all the following except:
1. pea
2. groundnut
3. beans
4. castor
1. pea
2. groundnut
3. beans
4. castor
Subtopic: Embryo | Seed |
88%
From NCERT
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Embryos of monocotyledons possess only one cotyledon. How many of the following statements will be true?
1. 1
2. 2
3. 3
4. 4
| I: | In the grass family, the cotyledon is called scutellum that is situated towards one side (lateral) of the embryonal axis. |
| II: | At its lower end, the embryonal axis has the radical and root cap enclosed in an undifferentiated sheath called coleorrhiza. |
| III: | The portion of the embryonal axis above the level of attachment of scutellum is the epicotyl. |
| IV: | Epicotyl has a shoot apex and a few leaf primordia enclosed in a hollow foliar structure, the coleoptile. |
1. 1
2. 2
3. 3
4. 4
Subtopic: Endosperm | Embryo |
78%
From NCERT
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In black pepper and beet:
1. seed are formed without fertilisation
2. remnants of nucellus are persistent
3. seeds are ex-albuminous
4. parthenocarpy is common in natural conditions
1. seed are formed without fertilisation
2. remnants of nucellus are persistent
3. seeds are ex-albuminous
4. parthenocarpy is common in natural conditions
Subtopic: Embryo | Seed | Fruit |
93%
From NCERT
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Consider the given two statements:
| Assertion (A): | In a few species such as apple, strawberry, cashew, etc., fruits produced are called false fruits. |
| Reason (R): | In these plants, by the time the fruit develops from the ovary, other floral parts degenerate and fall off. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A) |
| 2. | Both (A) and (R) are True and (R) does not correctly explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Fruit |
76%
From NCERT
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Discovered during the archeological excavation at King Herod’s palace near the Dead Sea, a 2000 years old viable seed is of:
| 1. | Phoenix dactylifera | 2. | Arabidopsis thaliana |
| 3. | Lupinus arcticus | 4. | Melandrium album |
Subtopic: Monocarpic & Polycarpic | FLOWER – A FASCINATING ORGAN OF ANGIOSPERMS |
82%
From NCERT
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The given figure shows:
1. Multicarpellary, syncarpous pistil
2. Multicarpellary, apocarpous gynoecium
3. Monocarpellary gynoecium
4. Sterile pistil
1. Multicarpellary, syncarpous pistil2. Multicarpellary, apocarpous gynoecium
3. Monocarpellary gynoecium
4. Sterile pistil
Subtopic: Monocarpic & Polycarpic | Pistil: Ovule | Pistil: Female Gametophyte |
78%
From NCERT
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Consider the given two statements:
| Assertion (A): | Endosperm tissue of angiosperms can be a source of nutrition in animal diet. |
| Reason (R): | Wheat endosperm is ground into flour for bread, while barley endosperm is the main source of sugars for beer production. |
| 1. | Both (A) and (R) are True and (R) explains (A) |
| 2. | Both (A) and (R) are True and (R) does not explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Endosperm |
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Consider the given two statements:
| Assertion (A): | Seed is the basis of our agriculture. |
| Reason (R): | Seeds are normally the products of sexual reproduction in angiosperms. |
| 1. | Both (A) and (R) are True and (R) explains (A) |
| 2. | Both (A) and (R) are True and (R) does not explain (A) |
| 3. | (A) is True but (R) is False |
| 4. | (A) is False but (R) is True |
Subtopic: Seed |
68%
From NCERT
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