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Q. No.Which of the following has proved helpful in preserving pollens as fossils?
1. Pollenkit
2. Cellulosic intine
3. Oil content
4. Sporopollenin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWinged pollen grains are present in:
1 Mustard
2. Cycas
3. Mango
4. Pinus
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPollen 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn majority of angiosperms
1. egg has a filiform apparatus
2. there are numerous antipodal cells
3. reduction division occurs in the megaspore mother cells
4. a small central cell is present in the embryo sac
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | Hydrilla | 2. | Yucca |
| 3. | Banana | 4. | Viola |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe ovule of an angiosperm is technically equivalent to:
1. megasporangium
2. megasporophyll
3. megaspore mother cell
4. megaspore
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFlowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by:
1. Bee
2. Wind
3. Bat
4. Water
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA dioecious flowering plant prevents both:
1. Autogamy and geitonogamy
2. Geitonogamy and xenogamy
3. Cleistogamy and xenogamy
4. Autogamy and xenogamy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology2. Pollen grains of many species cause severe allergies
3. Stored pollen in liquid nitrogen can be used in crop breeding programs
4. Tapetum helps in the dehiscence of anther
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