Pollen grains can be stored for several years in liquid nitrogen having a temperature of:
| 1. | –120 °C | 2. | –80 °C |
| 3. | –196 °C | 4. | –160 °C |
Subtopic: Stamen: Male Gametophyte |
95%
Level 1: 80%+
NEET - 2018
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In which of the following forms is iron absorbed by plants?
| 1. | Ferric | 2. | Ferrous |
| 3. | Free element | 4. | Both ferric and ferrous |
Subtopic: Mineral Function |
65%
Level 2: 60%+
NEET - 2018
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Double fertilization is:
| 1. | Fusion of two male gametes of a pollen tube with two different eggs |
| 2. | Fusion of one male gamete with two polar nuclei |
| 3. | Fusion of two male gametes with one egg |
| 4. | Syngamy and triple fusion |
Subtopic: Double Fertilization |
83%
Level 1: 80%+
NEET - 2018
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Which of the following elements is responsible for maintaining turgor in cells?
1. Magnesium
2. Sodium
3. Potassium
4. Calcium
2. Sodium
3. Potassium
4. Calcium
Subtopic: Mineral Function |
82%
Level 1: 80%+
NEET - 2018
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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
| 1. | Hydrilla | 2. | Yucca |
| 3. | Banana | 4. | Viola |
Subtopic: Pollination & Outbreeding Devices |
93%
Level 1: 80%+
NEET - 2018
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Hormones secreted by the placenta to maintain pregnancy are?
| 1. | hCG, hPL, progesterone, prolactin |
| 2. | hCG, hPL, estrogens, relaxin, oxytocin |
| 3. | hCG, hPL, progesterone, estrogens |
| 4. | hCG, progesterone, estrogens, glucocorticoids |
Subtopic: Embryonic Development till Gastrulation |
67%
Level 2: 60%+
NEET - 2018
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The contraceptive 'SAHELI':
| 1. | blocks estrogen receptors in the uterus, preventing implantation. |
| 2. | increases the concentration of estrogen and prevents ovulation in females. |
| 3. | is an lUD. |
| 4. | is a post-coital contraceptive. |
Subtopic: Hormonal Contraceptives, Emergency Contraception & Terminal Methods |
56%
Level 3: 35%-60%
NEET - 2018
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The difference between spermiogenesis and spermiation is?
| 1. | In spermiogenesis, spermatids are formed, while in spermiation, spermatozoa are formed. |
| 2. | In spermiogenesis, spermatozoa are formed, while in spermiation, spermatids are formed. |
| 3. | In spermiogenesis, spermatozoa from Sertoli cells are released into the cavity of seminiferous tubules, while in spermiation, spermatozoa are formed. |
| 4. | In spermiogenesis, spermatozoa are formed, while in spermiation, spermatozoa are released from Sertoli cells into the cavity of seminiferous tubules. |
Subtopic: Spermiogenesis/Sperm Structure/Hormonal Regulation |
76%
Level 2: 60%+
NEET - 2018
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The amnion of mammalian embryo is derived from?
| 1. | ectoderm and mesoderm | 2. | endoderm and mesoderm |
| 3. | mesoderm and trophoblast | 4. | ectoderm and endoderm |
Subtopic: Embryonic Development till Gastrulation |
Level 3: 35%-60%
NEET - 2018
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In a growing population of a country:
| 1. | pre-reproductive individuals are more than reproductive individuals. |
| 2. | reproductive individuals are less than post-reproductive individuals. |
| 3. | reproductive and pre-reproductive individuals are equal in number. |
| 4. | pre-reproductive individuals are less than reproductive individuals. |
Subtopic: Population Attributes |
87%
Level 1: 80%+
NEET - 2018
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