- Define and explain Plant Reproduction in your own words
- Use key terms such as pollination accurately
- Apply what you have learned to new examples and questions
- Avoid the common mistakes learners make with this topic
Every living thing comes from a parent, yet life cycles vary enormously: a butterfly transforms completely while a human baby simply grows larger. In this chapter you will explore reproduction in flowering plants, compare animal life cycles, follow the human journey from birth to old age, and learn what happens during puberty.
This lesson focuses on Plant Reproduction: learn how flowers, pollination and seeds create the next generation of plants.
Learn how flowers, pollination and seeds create the next generation of plants.
Key ideas
Reproduction in flowering plants
The flower is the reproductive organ of the plant. Pollen made in the anthers is transferred to the stigma (pollination), often by insects attracted to bright petals and nectar. A pollen tube then grows down to the ovary, where fertilisation happens. The ovary becomes the fruit and the ovules become seeds, which can be dispersed to grow into new plants.
Animal life cycles
Mammals give birth to live young that grow steadily into adults. Birds lay eggs that hatch into chicks. Amphibians such as frogs lay eggs in water that hatch into tadpoles, which gradually change into froglets. Insects such as butterflies undergo complete metamorphosis: egg → larva (caterpillar) → pupa (chrysalis) → adult. Each strategy suits the animal's habitat.
Key term — pollination: The transfer of pollen from the anther to the stigma of a flower, carried out by insects, wind or other agents.
Name two ways insects help flowering plants reproduce.
Insects carry pollen between flowers when visiting for nectar; bright petals and scent attract them, and sticky or spiky pollen clings to their bodies.
Answer: Insects carry pollen between flowers when visiting for nectar; bright petals and scent attract them, and sticky or spiky pollen clings to their bodies.
- Saying seeds are made by pollination alone A seed only forms after fertilisation. Without it, the ovule never develops into a seed.
- Confusing pollination with fertilisation Pollination is the transfer of pollen to the stigma; fertilisation is the later fusion of gametes inside the ovary. One is delivery, the other is joining.
Practice
Most seeds are eaten, land in unsuitable places, or fail to germinate. Producing huge numbers increases the chance that at least some survive to become new plants.
Pollination is the transfer of pollen from anther to stigma. Fertilisation is the fusion of male and female gametes to form a zygote.
Egg → larva (caterpillar) → pupa (chrysalis) → adult.
Frogs lay eggs in water that hatch into tadpoles, which live in water and undergo metamorphosis into air-breathing froglets. Human babies are born live and grow steadily without metamorphosis.
Quick check
Which of these best defines "pollination"?
Give two physical changes that happen during puberty.
- Plant Reproduction: learn how flowers, pollination and seeds create the next generation of plants.
- Reproduction in flowering plants: The flower is the reproductive organ of the plant.
- adolescence: The stage of life between childhood and adulthood when puberty occurs and the body becomes capable of reproduction.
- Watch out for: saying seeds are made by pollination alone