Chapter Exam

Chapter 1: Sexual Reproduction in Flowering Plants — Online MCQ Test

Q: What is the functional unit of sexual reproduction in flowering plants?

Answer: B. Flower — The flower is the reproductive organ of flowering plants and contains both male and female reproductive structures.

Q: Which of the following is NOT a part of the flower's male reproductive system?

Answer: C. Carpel — Carpel is the female reproductive part of the flower; anther, filament, and pollen grain are parts of the male stamen.

Q: In a typical polygonum-type embryo sac, how many nuclei are present at maturity?

Answer: C. Seven — The mature polygonum-type embryo sac typically contains 7 nuclei arranged as: 3 in the egg apparatus, 2 polar nuclei, and 2 antipodal cells.

BIOLOGY · CLASS 12 SECOND PUC · Karnataka State Board

Practice Chapter 1: Sexual Reproduction in Flowering Plants with a free chapter-wise online MCQ test for Karnataka State Board CLASS 12 SECOND PUC BIOLOGY. This chapter covers: Flower Morphology Microsporogenesis Megasporogenesis Pollination Double Fertilisation Embryo Sac Pollen Grain Seed Formation Fruit Development Angiosperms. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 1: Sexual Reproduction in Flowering Plants — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 12 SECOND PUC BIOLOGY — Chapter 1: Sexual Reproduction in Flowering Plants, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the functional unit of sexual reproduction in flowering plants?

A. Leaf
B. Flower ✓
C. Stem
D. Root

Answer: B. Flower
The flower is the reproductive organ of flowering plants and contains both male and female reproductive structures.

Which of the following is NOT a part of the flower's male reproductive system?

A. Anther
B. Filament
C. Carpel ✓
D. Pollen grain

Answer: C. Carpel
Carpel is the female reproductive part of the flower; anther, filament, and pollen grain are parts of the male stamen.

In a typical polygonum-type embryo sac, how many nuclei are present at maturity?

A. Three
B. Five
C. Seven ✓
D. Nine

Answer: C. Seven
The mature polygonum-type embryo sac typically contains 7 nuclei arranged as: 3 in the egg apparatus, 2 polar nuclei, and 2 antipodal cells.

Which statement correctly describes the relationship between fruit and seed formation?

A. Fruits develop before seeds form
B. Seeds develop independently of fruit formation
C. Fruit develops from the ovary after fertilization; seeds develop from ovules ✓
D. Fruits and seeds are the same structure

Answer: C. Fruit develops from the ovary after fertilization; seeds develop from ovules
After double fertilization, the ovary wall develops into the fruit (pericarp) while ovules mature into seeds containing the embryo and endosperm.

A botanist observes that in a particular angiosperm species, the megaspore mother cell undergoes meiosis to produce four spores, but only one develops into a functional embryo sac. The three others degenerate. This pattern is most likely due to:

A. Mutation during meiosis
B. Nutritional competition where the developing megaspore suppresses others through differential nutrient allocation ✓
C. Random genetic events
D. Chromosomal abnormalities in three megaspores

Answer: B. Nutritional competition where the developing megaspore suppresses others through differential nutrient allocation
This is a developmental pattern where the first-formed megaspore receives maximum nutrient allocation from the nucellus, while others degenerate due to limited resources.