The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. Consequently, what should one expect to be true of such seeds?
1. They require extensive periods of dormancy during which the embryo develops
2. They are surrounded by brightly colored, sweet fruit
3. They germinate very soon after being released from the ovary
4. The developing embryo within is dependent upon the gametophyte for nutrition
Subtopic: Seed |
Level 3: 35%-60%
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Recent research has shown that pollination requires that carpels recognize pollen grains as "self or nonself." For self-incompatibility, the system requires
1. the rejection of nonself cells
2. the rejection of self cells.
3. carpel incompatibility with the egg cells.
4. that the flowers be incomplete.
1. the rejection of nonself cells
2. the rejection of self cells.
3. carpel incompatibility with the egg cells.
4. that the flowers be incomplete.
Subtopic: Pollen - Pistil Interaction |
67%
Level 2: 60%+
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Which of the following is the correct sequence of events in a pollen sac?
| 1. | sporangia → meiosis → two haploid cells → meiosis → two pollen grains per cell |
| 2. | pollen grain → meiosis → two generative cells → two tube cells per pollen grain |
| 3. | two haploid cells → meiosis → generative cell → tube cell-fertilization → pollen grain |
| 4. | microsporocyte → meiosis → microspores → mitosis → two haploid cells per pollen grain |
Subtopic: Stamen: Microsporangium | Stamen: Male Gametophyte |
66%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | Nocturnal flowers are pollinated by moths. |
| Reason (R): | Nocturnal flowers are highly fragrant and dull in colour |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True and (R) is not the correct explanation of (A). |
| 3. | (A) is True, (R) is False. |
| 4. | Both (A) and (R) are False |
Subtopic: Pollination & Outbreeding Devices |
51%
Level 3: 35%-60%
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Subtopic: Pollination & Outbreeding Devices |
94%
Level 1: 80%+
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Which of the following is/are NOT developed from ovary?
A. Apple
B. Tomato
C. Mango
D. Coconut
E. Cashewnut
Choose the correct answer from the options given below:
1. A and B only
2. A only
3. A, C and D only
4. A and E only
A. Apple
B. Tomato
C. Mango
D. Coconut
E. Cashewnut
Choose the correct answer from the options given below:
1. A and B only
2. A only
3. A, C and D only
4. A and E only
Subtopic: Fruit |
78%
Level 2: 60%+
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Characteristics of wind-pollinated plants are
A. Well exposed stamens
B. Colorful flowers
C. Non-sticky pollen
D. Fragrant flowers
E. Flowers rich in nectar
Choose the correct answer from the option given below:
1. A & B only
2. A & C only
3. A, B & C only
4. C, D & E only
A. Well exposed stamens
B. Colorful flowers
C. Non-sticky pollen
D. Fragrant flowers
E. Flowers rich in nectar
Choose the correct answer from the option given below:
1. A & B only
2. A & C only
3. A, B & C only
4. C, D & E only
Subtopic: Pollination & Outbreeding Devices |
90%
Level 1: 80%+
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A typical embryo sac in Angiosperms at maturity is
1. 7 nucleate and 8 celled
2. 8 nucleate and 7 celled
3. 4 nucleate and 7 celled
4. 8 nucleate and 8 celled
1. 7 nucleate and 8 celled
2. 8 nucleate and 7 celled
3. 4 nucleate and 7 celled
4. 8 nucleate and 8 celled
Subtopic: Pistil: Female Gametophyte |
92%
Level 1: 80%+
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Triple fusion in angiosperms is the fusion of second sperm with
1. Antipodal cell and one synergid cell
2. Two antipodal cells
3. Two synergid cells
4. Two polar nuclei
1. Antipodal cell and one synergid cell
2. Two antipodal cells
3. Two synergid cells
4. Two polar nuclei
Subtopic: Double Fertilization |
89%
Level 1: 80%+
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In general the egg apparatus of embryo sac in angiosperm consists of:
| 1. | One egg cell, two synergids |
| 2. | One egg cell, two synergids, two antipodal cells, three Polar nuclei |
| 3. | One egg cell, three synergids, two antipodal cells, two Polar nuclei |
| 4. | One egg cell, two synergids, two antipodal cells, two Polar nuclei |
Subtopic: Pistil: Female Gametophyte |
89%
Level 1: 80%+
NEET - 2022
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