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Q. No.Phoenix dactylifera is commonly known as:
1.
Deadly nightshade
2.
Date palm
3.
Lupine
4.
Methuselah
Subtopic: Seed |
86%
From NCERT
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In grass embryos, a flap-like structure present opposite to the scutellum is called as:
1. coleoptile
2. coleorrhiza
3. epiblast
4. hypoblast
1. coleoptile
2. coleorrhiza
3. epiblast
4. hypoblast
Subtopic: Embryo |
57%
From NCERT
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Antipodal is an adjective that means ‘diametrically opposite’. Where are the antipodal cells located in an embryosac of an angiosperm?
1. At the micropylar end
2. At the chalazal end
3. In the middle
4. There are three – one at micropylar and two at chalazal end
1. At the micropylar end
2. At the chalazal end
3. In the middle
4. There are three – one at micropylar and two at chalazal end
Subtopic: Pistil: Ovule |
87%
From NCERT
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In the fully developed female gametophyte of a typical angiosperm:
| 1. | three cells are grouped together at the chalazal end to constitute the egg apparatus |
| 2. | three cells are grouped together at the micropylar and are called antipodals |
| 3. | antipodals have special cellular thickenings called as filiform apparatus |
| 4. | polar nuclei are located in the large central cell |
Subtopic: Pistil: Female Gametophyte |
83%
From NCERT
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Regarding pollen grains:
1. Only I is correct
2. Only I and III are correct
3. Only II is correct
4. I, II and III are correct
| I. | Exine is made up of sporopollenin |
| II. | Generative cell is bigger than the vegetative cell |
| III. | Generative cell divides meiotically to produce male gametes |
2. Only I and III are correct
3. Only II is correct
4. I, II and III are correct
Subtopic: Stamen: Male Gametophyte |
58%
From NCERT
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Plants do not contain many parts that can be easily fossilized. Which of the following has proved helpful in preserving pollens as fossils?
1. Pollenkit
2. Cellulosic intine
3. Callose in pollen tetrad
4. Sporopollenin
1. Pollenkit
2. Cellulosic intine
3. Callose in pollen tetrad
4. Sporopollenin
Subtopic: Stamen: Male Gametophyte |
93%
From NCERT
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A persistent nutritive tissue of a seed derived from the nucellus and deposited external to the embryo sac —distinguished from endosperm is known as:
1. Tegmen
2. Chalaza
3. Perisperm
4. Hilum
1. Tegmen
2. Chalaza
3. Perisperm
4. Hilum
Subtopic: Seed |
90%
From NCERT
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Identify the part labelled as 3 in the given diagram:
| 1. | Micropyle | 2. | Nucellus |
| 3. | Funiculus | 4. | Hilum |
Subtopic: Pistil: Ovule |
52%
From NCERT
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The only type of pollination which brings genetically different types of pollen grains to the stigma is:
1. Cleistogamy
2. Chasmogamy
3. Geitonogamy
4. Xenogamy
1. Cleistogamy
2. Chasmogamy
3. Geitonogamy
4. Xenogamy
Subtopic: Pollination & Outbreeding Devices |
91%
From NCERT
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In ‘double fertilization’ in angiosperms:
| I: | Syngamy results in the formation of zygote. |
| II: | Triple fusion results in the formation of the primary endosperm nucleus. |
| 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: Double Fertilization |
93%
From NCERT
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