Class 6 The Flower MCQ with Answers

MCQs and Mock Test | NCERT - CBSE Curriculum

Practice Class 6 The Flower MCQs with answers.
Learn flower structure, parts, pollination, fertilisation, and seed formation - with instant answers and performance report.

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Quick Revision: The Flower

  • Pedicel: The stalk that attaches a flower to the stem or branch. Flowers without a pedicel are called sessile flowers.
  • Thalamus: The swollen upper tip of the pedicel to which all floral parts (whorls) are attached.
  • Four Whorls of a Flower: (1) Calyx (sepals) — outermost, protects bud; (2) Corolla (petals) — attracts insects; (3) Androecium (stamens) — male reproductive part; (4) Gynoecium (pistil/carpel) — female reproductive part.
  • Accessory Whorls: Calyx and Corolla — only help in pollination, not directly reproductive.
  • Essential Whorls: Androecium and Gynoecium — directly involved in reproduction and seed formation.
  • Stamen: Male unit, consists of anther (produces pollen grains) and filament (stalk).
  • Pistil (Carpel): Female unit, consists of ovary (contains ovules), style (stalk), and stigma (sticky tip that traps pollen).
  • Complete vs Incomplete: Complete flowers have all four whorls; incomplete flowers lack one or more.
  • Unisexual vs Bisexual: Unisexual flowers have only stamens or only pistil (e.g., Papaya, Cucumber). Bisexual flowers have both (e.g., Hibiscus, Mustard).
  • Monoecious vs Dioecious: Monoecious — male & female flowers on same plant (Maize, Coconut). Dioecious — male & female flowers on separate plants (Papaya).
  • Pollination: Transfer of pollen grains from anther to stigma. Self-pollination (same flower/plant) vs Cross-pollination (different plants).
  • Agents of Pollination: Insects (bright petals, nectar, scent), Wind (feathery stigma, large pollen quantity), Water (e.g., Vallisneria — male flowers float to reach females).
  • Fertilisation: Fusion of male and female gametes to form a zygote. Pollen tube carries male gametes through style to ovule.
  • After Fertilisation: Ovary → Fruit, Ovules → Seeds, Petals/Stamens/Sepals → Wither and fall off.
  • Fruit Structure: Pericarp (fruit wall) has three layers: Epicarp (outer skin), Mesocarp (fleshy middle, e.g., mango pulp), Endocarp (inner hard layer, e.g., mango stone).
  • True Fruit vs False Fruit: True fruit develops only from ovary (e.g., Mango). False fruit develops from thalamus also (e.g., Apple, Strawberry).
  • Dry Fruit vs Fleshy Fruit: Dry fruit has thin, dry pericarp (Maize, Pea). Fleshy fruit has soft, pulpy pericarp (Mango, Orange).
  • Seed Structure: Seed coat (from integuments), Micropyle (tiny opening for water/oxygen), Hilum (scar where seed attached to fruit). Embryo consists of Radicle (young root), Plumule (young shoot), and Cotyledons (food storage).
  • Dicot vs Monocot Seeds: Dicots (Pea, Gram) — two fleshy cotyledons store food. Monocots (Maize, Rice) — one thin cotyledon, food stored in endosperm, seed coat fused with fruit wall forming a grain.
  • Seed Germination: Requires water (imbibition → swelling → coat ruptures), oxygen (respiration for energy), and suitable warmth. Epigeal — cotyledons come above soil (Bean). Hypogeal — cotyledons stay underground (Pea, Maize).
  • Seed Dispersal: By wind (wings/hair — Drumstick, Maple), water (spongy coat — Coconut, Lotus), animals (hooks/spines — Xanthium, Urena), explosive action (Poppy capsule).

The Flower Class 6 Questions and Answers (FAQ)

What are the main parts of a flower and their functions for Class 6 students?
A typical flower has four main parts called whorls: (1) Calyx - made of green sepals that protect the flower bud; (2) Corolla - made of brightly coloured petals that attract insects for pollination; (3) Androecium - the male reproductive part made of stamens, where each stamen has an anther (produces pollen) and a filament (stalk); (4) Gynoecium - the female reproductive part made of pistils, where each pistil has an ovary (contains ovules), a style (stalk), and a stigma (sticky top to catch pollen). The calyx and corolla are called accessory whorls, while androecium and gynoecium are essential whorls.
What is pollination and what are its different types?
Pollination is the transfer of pollen grains from the anther (male part) to the stigma (female part) of a flower. There are two main types: (1) Self-pollination - when pollen is transferred within the same flower or to another flower on the same plant. (2) Cross-pollination - when pollen is transferred to a flower on a different plant of the same species. Pollination is carried out by agents like insects (attracted by bright petals, nectar, and scent), wind (which requires large amounts of light pollen and feathery stigmas), and water (as seen in the Vallisneria plant).
What happens to a flower after fertilisation?
After fertilisation, where the male and female gametes fuse to form a zygote, the flower undergoes major changes: (1) The ovary develops into a fruit; (2) The ovules inside the ovary develop into seeds; (3) The petals, stamens, sepals, style, and stigma wither and fall off; (4) The zygote develops into an embryo within the seed. The fruit protects the seeds and helps in their dispersal. The seed contains the embryo (baby plant) along with stored food, which helps it grow into a new plant under suitable conditions.
What is the difference between a dicot and a monocot seed?
The main differences between dicot and monocot seeds are: (1) Cotyledons - Dicot seeds (like pea and gram) have two fleshy cotyledons; monocot seeds (like maize and rice) have only one thin, paper-like cotyledon. (2) Food Storage - In dicots, food is stored in the two cotyledons; in monocots, food is stored in a separate tissue called the endosperm. (3) Seed Coat - In dicots, the seed coat is distinct; in monocots, the seed coat is often fused with the fruit wall to form a grain. (4) Germination - Dicots can show either epigeal or hypogeal germination, while monocots typically show hypogeal germination.
What conditions are necessary for seed germination and how are seeds dispersed?
For seed germination, three conditions are necessary: (1) Water - for imbibition, which causes the seed to swell and the seed coat to rupture; (2) Oxygen - for respiration to release energy for growth; (3) Suitable warmth (temperature) - to regulate metabolism and growth rate. Seeds are dispersed in several ways to prevent overcrowding: (1) By Wind - seeds with wings or hair tufts (Drumstick, Maple); (2) By Water - seeds with a spongy or fibrous coat (Coconut, Lotus); (3) By Animals - seeds with hooks or spines that attach to fur (Xanthium), or seeds eaten and passed out; (4) By Explosive Action - pods that burst and scatter seeds (Poppy).

Chapter Summary: The Flower

A flower is the reproductive part of a plant. It is attached to the stem by a stalk called the pedicel, with the thalamus at its tip holding all floral parts. A typical flower has four whorls: Calyx (sepals — protect the bud), Corolla (petals — attract pollinators), Androecium (stamens — male reproductive part with anther producing pollen), and Gynoecium (pistil — female part with ovary, style, and stigma). Calyx and corolla are accessory whorls, while androecium and gynoecium are essential whorls. Flowers may be complete or incomplete, unisexual or bisexual, and plants may be monoecious or dioecious.

Pollination is the transfer of pollen from anther to stigma, aided by insects, wind, or water. Fertilisation follows, where male and female gametes fuse to form a zygote. After fertilisation, the ovary develops into a fruit and the ovules become seeds. The pericarp (fruit wall) has three layers: epicarp, mesocarp, and endocarp. Seeds contain an embryo (radicle, plumule, cotyledons) and a seed coat with a micropyle for water entry. Dicot seeds store food in cotyledons, while monocot seeds store food in endosperm. Germination requires water (imbibition), oxygen, and warmth. Seeds are dispersed by wind, water, animals, or explosive action to prevent overcrowding and ensure species survival.

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