Pollen Germination In Vitro — NEET Biology
📚 Practice ConceptYou can easily study pollen germination by dusting some pollen from flowers such as pea, chickpea, Crotalaria, balsam and Vinca on a glass slide containing a drop of sugar solution (about 10 per cent). After about 15-30 minutes, observe the slide under the low power lens of the microscope. You are likely to see pollen tubes coming out of the pollen grains.
Match the following structures from flowering plants with their correct characteristic or function: Column I (Structure) A. Tapetum B. Filiform apparatus C. Zygote D. Primary Endosperm Nucleus E. Micropyle Column II (Characteristic / Function) (I) Formed after syngamy (II) Nourishes developing microspores (III) Guides pollen tube into embryo sac (IV) Facilitates entry of O₂ and water into seed (V) Formed by triple fusion
View solution & NCERT explanation
Correct answer: B — A-II, B-III, C-I, D-V, E-IV
This question requires matching various structures involved in sexual reproduction in flowering plants with their specific characteristics or functions as described in NCERT. A. Tapetum: This innermost wall layer of the microsporangium nourishes the developing pollen grains (microspores). So, A matches with (II). B. Filiform apparatus: Located at the micropylar tip of synergids, it plays a crucial role in guiding the pollen tubes into the synergid (and thus into the embryo sac). So, B matches with (III). C. Zygote: Formed by the fusion of one male gamete with the egg cell (syngamy). So, C matches with (I). D. Primary Endosperm Nucleus (PEN): This triploid nucleus is formed by the fusion of the other male gamete with the two polar nuclei, an event known as triple fusion. So, D matches with (V). E. Micropyle: In a mature seed, the micropyle remains as a small pore, facilitating the entry of oxygen and water during seed germination. So, E matches with (IV). Therefore, the correct match is A-II, B-III, C-I, D-V, E-IV.
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