NEET · Biology · Class 12Sexual Reproduction in Flowering Plants — NEET Biology MCQs
30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.
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Sample questions from this chapter
A transverse section of a typical young angiosperm anther shows four pollen-forming chambers at its corners. Which structural description fits?
- Bilobed, dithecous and tetrasporangiate ✓
- Unilobed, monothecous and bisporangiate
- Bilobed with one microsporangium in each lobe
- Four-lobed with one ovule in each corner
Answer: A. Two lobes, two theca per lobe and four microsporangia make the typical anther bilobed, dithecous and tetrasporangiate. Counting visible lobes alone can make the two internal sacs per lobe easy to miss.
Why not B: A typical anther has two lobes and two theca per lobe rather than a single lobe and theca.
Why not C: Each lobe contains two longitudinal microsporangia, producing four in the whole anther.
Why not D: Ovules arise inside the ovary; anther chambers produce microspores.
A maize plant bears separate male and female flowers on the same individual. Which selfing route is prevented, and which can still occur?
- Geitonogamy is prevented but autogamy remains
- Both autogamy and geitonogamy are prevented
- Autogamy is prevented but geitonogamy remains possible ✓
- Xenogamy is prevented but autogamy remains
Answer: C. Monoecy separates anther and stigma into different flowers, eliminating autogamy but permitting geitonogamy through a pollinator. Papaya-like dioecy prevents both genetic self routes.
Why not A: One unisexual flower cannot pollinate itself, whereas pollen can move to another flower on the plant.
Why not B: Dioecy, not monoecy, places the sexes on different plants and blocks both routes.
Why not D: Pollen can still arrive from another maize plant, so xenogamy remains possible.
A functional megaspore completes three free-nuclear mitoses, but cytokinesis then surrounds six peripheral nuclei while leaving the polar pair in one central cell. What structure results?
- A seven-celled, eight-nucleate female gametophyte ✓
- An eight-celled, eight-nucleate pollen grain
- A four-celled diploid megaspore tetrad
- A seven-celled triploid endosperm
Answer: A. Three mitoses yield eight haploid nuclei; selective cellularisation yields three egg-apparatus cells, three antipodals and one binucleate central cell. Counting nuclei and cells separately resolves the apparent mismatch.
Why not B: The sequence occurs in one ovular megaspore and produces an embryo sac, not a male gametophyte.
Why not C: The tetrad precedes selection of the functional megaspore and arises by meiosis.
Why not D: Endosperm develops only after triple fusion and is not organised into the egg-apparatus pattern.
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Other NEET Biology chapters
The Living WorldBiological ClassificationPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering Plants
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Questions
How many NEET questions are there on Sexual Reproduction in Flowering Plants?
This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 12 chapter.
Is this NEET Biology chapter test free?
Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.
Do the questions explain the wrong options?
Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.