A typical angiosperm anther is dithecous which means that it is:
(1) One lobed and the lobe has two theca
(2) Two lobed and each lobe has two theca
(3) Two lobed and each lobe has one theca
(4) Four lobed and each lobe has two theca
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following layers in the wall of an anther nourishes the developing pollen grains?
1. Tapetum
2. Epidermis
3. Endothecium
4. Middle layers
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPollen intine is made of:
1. Sporopollenin
2. Cellulose and pectin
3. Ergosterol
4. Phospholipids and cholesterol
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPollen grains lose their viability within 30 minutes of their release in:
1. Rose
2. Potato
3. Pea
4. Wheat
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe pistil of Papaver is:
1. Monocarpellary
2. Multicarpellary apocarpous
3. Multicarpellary syncarpous
4. Absent
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHow many of the nuclei in the female gametophyte in angiosperms are surrounded by cell wall?
(1) 5
(2) 6
(3) 7
(4) 8
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe only type of pollination that brings genetically different types of pollen grains to the stigma is:
(1) Chasmogamy
(2) Cleistogamy
(3) Geitonogamy
(4) Xenogamy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDioecy in plants prevents:
(1) Autogamy but not geitonogamy
(2) Geitonogamy but not autogamy
(3) Both autogamy and geitonogamy
(4) Neither autogamy nor geitonogamy
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the female parent produces unisexual flower:
(1) Emasculation must be done before maturity
(2) Emasculation must be done after maturity
(3) Emasculation must be done before pollination
(4) Emasculation is not needed
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe central cell in the embryo sac, after triple fusion, becomes:
(1) Primary endosperm cell
(2) Endosperm
(3) Embryo
(4) Zygote
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology