BiologyChapter 11: Reproduction
Pollination, Fertilisation, Seed
Pollination: pollen from anther to stigma (self or cross).
Learning objectives
- Explain pollination, fertilisation, seed in clear biological language.
- Distinguish 1. pollination types from 2. seed and fruit.
- Use the key terms to answer a short Federal Board exam question.
Definition
Pollination: pollen from anther to stigma (self or cross). Agents: wind, insect, bird, water named. Pollen tube to the ovule. Double fertilisation: one sperm + egg -> zygote; other + polar nuclei -> endosperm (3n school). Seed: embryo + store + coat. Fruit: ovary wall. Dispersal: wind, animal, explosive named. Germination: water, O2, warmth; epigeal vs hypogeal named. Pollination is separate from fertilisation: pollen must land on a stigma, then a pollen tube grows to the ovule. Double fertilisation is unique to angiosperms and produces both embryo and endosperm.
Important terms
- POLLINATION, FERTILISATION, SEED
- Pollination: pollen from anther to stigma (self or cross).
- 1. POLLINATION TYPES
- Self: same flower or same plant.
- 2. SEED AND FRUIT
- Endosperm feeds the embryo (cereal).
Overview
From dust to seedling:
Pollination Types
Self: same flower or same plant. Cross: other plant, more mix. Dichogamy and self-incompatibility named as anti-self tricks. Wind: lots of light pollen. Insect: sticky pollen. Self-pollination: same flower or plant — less variation. Cross-pollination: different plant — more variation. Adaptations: dichogamy, self-incompatibility, showy flowers for insects.
Examples Anemophily named · Entomophily named · No GM pollen-lab method
Seed and Fruit
Endosperm feeds the embryo (cereal). Cotyledons in beans. Dormancy: wait. Scarify/cold named as nature cues, not a warehouse process. False fruit (apple) if the book asks. Seed = embryo + endosperm/cotyledon store + testa (seed coat). Fruit develops from ovary wall. Dispersal: wind (dandelion), animal (berry), explosive (pea pod).
Examples True fruit = ovary · Dispersal away from parent · Germination needs water + O2 + T
WHAT — POLLINATION, FERTILISATION, SEED
Pollination: pollen from anther to stigma (self or cross). Agents: wind, insect, bird, water named. Pollen tube to the ovule. Double fertilisation: one sperm + egg -> zygote; other + polar nuclei -> endosperm (3n school). Seed: embryo + store + coat. Fruit: ovary wall. Dispersal: wind, animal, explosive named. Germination: water, O2, warmth; epigeal vs hypogeal named. Pollination is separate from fertilisation: pollen must land on a stigma, then a pollen tube grows to the ovule. Double fertilisation is unique to angiosperms and produces both embryo and endosperm.
WHY — Why this topic matters
POLLINATION, FERTILISATION, SEED is an independent FBISE learning unit because students must connect its structures and processes with their biological functions and examples.
HOW — How it works
POLLINATION TYPES: Self: same flower or same plant. Cross: other plant, more mix. Dichogamy and self-incompatibility named as anti-self tricks. Wind: lots of light pollen. Insect: sticky pollen. Self-pollination: same flower or plant — less variation. Cross-pollination: different plant — more variation. Adaptations: dichogamy, self-incompatibility, showy flowers for insects. Examples: Anemophily named; Entomophily named; No GM pollen-lab method. SEED AND FRUIT: Endosperm feeds the embryo (cereal). Cotyledons in beans. Dormancy: wait. Scarify/cold named as nature cues, not a warehouse process. False fruit (apple) if the book asks. Seed = embryo + endosperm/cotyledon store + testa (seed coat). Fruit develops from ovary wall. Dispersal: wind (dandelion), animal (berry), explosive (pea pod). Examples: True fruit = ovary; Dispersal away from parent; Germination needs water + O2 + T. Worked double fertilisation: Sperm 1 + egg -> 2n zygote. Sperm 2 + polar nuclei -> 3n endosperm (school). Unique to angiosperms in the syllabus tale.
Worked example
- Worked double fertilisation:
- Sperm 1 + egg -> 2n zygote.
- Sperm 2 + polar nuclei -> 3n endosperm (school).
- Unique to angiosperms in the syllabus tale.
In simple words
Life cycle. No seed-patent or crossing how-to.
Key points
- pollen to stigma
- double fertilisation
- self vs cross
- embryo + store + coat
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Pollination, Fertilisation, Seed
Sticky Notes · Quick Revision
Core Idea
- Pollination: pollen from anther to stigma (self or cross). Agents: wind, insect, bird, water named. Pollen tube to the ovule. Double fertilisation: one sperm + egg -> zygote; other + polar nuclei -> endosperm (3n school). Seed: embryo + store + coat. Fruit: ovary wall. Dispersal: wind, animal, explosive named. Germination: water, O2, warmth; epigeal vs hypogeal named. Pollination is separate from fertilisation: pollen must land on a stigma, then a pollen tube grows to the ovule. Double fertilisation is unique to angiosperms and produces both embryo and endosperm.
1. POLLINATION TYPES
- Self: same flower or same plant. Cross: other plant, more mix. Dichogamy and self-incompatibility named as anti-self tricks. Wind: lots of light pollen. Insect: sticky pollen. Self-pollination: same flower or plant — less variation. Cross-pollination: different plant — more variation. Adaptations: dichogamy, self-incompatibility, showy flowers for insects.
2. SEED AND FRUIT
- Endosperm feeds the embryo (cereal). Cotyledons in beans. Dormancy: wait. Scarify/cold named as nature cues, not a warehouse process. False fruit (apple) if the book asks. Seed = embryo + endosperm/cotyledon store + testa (seed coat). Fruit develops from ovary wall. Dispersal: wind (dandelion), animal (berry), explosive (pea pod).
Exam Example
- Worked double fertilisation:
- Sperm 1 + egg -> 2n zygote.
- Sperm 2 + polar nuclei -> 3n endosperm (school).
- Unique to angiosperms in the syllabus tale.
Common Misconception
- Do not treat 1. POLLINATION TYPES and 2. SEED AND FRUIT as the same idea; each explains a different part of the topic.
FBISE Exam Check
- Define pollination, fertilisation, seed, explain the two key parts, and use the correct biological terms.
- Exam reminder: Worked double fertilisation: Sperm 1 + egg -> 2n zygote. Sperm 2 + polar nuclei -> 3n endosperm (school). Unique to angiosperms in the syllabus tale.
60-second revision
- Pollination: pollen from anther to stigma (self or cross).
- 1. POLLINATION TYPES: Self: same flower or same plant.
- 2. SEED AND FRUIT: Endosperm feeds the embryo (cereal).
- Exam reminder: Worked double fertilisation: Sperm 1 + egg -> 2n zygote. Sperm 2 + polar nuclei -> 3n endosperm (school). Unique to angiosperms in the syllabus tale.
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