Plant Reproduction: Seeds, Germination, and Pollination

A Today you'll learn

Identify the parts of a seed (seed coat, cotyledons, embryo) and required germination conditions.
Explain the process of pollination and the role of pollinators (bees, butterflies, wind).
Differentiate sexual reproduction via flowers and seeds from vegetative propagation (stem, leaf, root).

B Let's understand

Plants reproduce to ensure the continuation of their species. Most flowering plants reproduce through seeds. A seed contains three main parts: the protective outer seed coat (testa), cotyledons (seed leaves that store food), and the embryo (baby plant with plumule and radicle). For germination, a seed requires water, air (oxygen), and warmth. In flowering plants, pollination is the transfer of pollen grains from the male anther to the female stigma, facilitated by insects, birds, wind, or water. Fertilisation follows, forming seeds inside fruits. Some plants reproduce non-sexually through vegetative parts: potatoes via eyes (buds), ginger via rhizomes, and Bryophyllum via leaf margins.

C See it step by step

Example 1: What happens to a soaked bean seed when it starts to germinate?

Step 1: The seed absorbs water through a tiny pore, swelling up and softening the seed coat.
Step 2: Cells in the embryo become active using stored food in cotyledons.
Step 3: The radicle emerges first, growing downward into the soil to form roots.
Step 4: The plumule grows upward toward sunlight to form the shoot and leaves.

Example 2: How do honeybees help flowering plants reproduce?

Step 1: Bees visit flowers to collect sweet nectar for food.
Step 2: Sticky pollen grains from the anthers cling to the bee’s hairy body.
Step 3: When the bee flies to another flower, pollen rubs off onto the sticky stigma.
Step 4: This accomplishes cross-pollination, leading to seed formation.

D Your turn

The baby plant inside a seed is called the:

Look back at "Let's understand" above for a clue.

E Ready to practise?

A seed contains a seed coat

A seed contains a seed coat, cotyledons (food store), and an embryo.

Key idea 2

Germination requires three essential factors: moisture, warmth, and oxygen.

Key idea 3

The radicle grows downward into roots; the plumule grows upward into shoots.

Key idea 4

Pollination is the transfer of pollen from the anther to the stigma.

Key idea 5

Vegetative propagation grows new plants from stems (potato, rose), roots (sweet potato), or leaves (Bryophyllum).

Warm up

1. Name the three external conditions necessary for seed germination.

2. Which part of the embryo grows downward to become the root system?

3. What is stored inside the cotyledons of a seed?

Practise

4. Define pollination in your own words.

5. Name two natural agents of pollination.

6. How does a potato reproduce without seeds?

Challenge

7. Name a plant that produces new plantlets from the notches of its leaves.

8. Why do flowers have brightly coloured petals and sweet nectar?

Download worksheet (PDF)

Question 1: Name the three external conditions necessary for seed germination.

Answer: Water (moisture), warmth, and air (oxygen)

Question 2: Which part of the embryo grows downward to become the root system?

Answer: The radicle

Question 3: What is stored inside the cotyledons of a seed?

Answer: Food for the growing baby plant (embryo)

Question 4: Define pollination in your own words.

Answer: The transfer of pollen grains from the anther to the stigma of a flower

Question 5: Name two natural agents of pollination.

Answer: Insects (bees/butterflies) and wind (or birds/water)

Question 6: How does a potato reproduce without seeds?

Answer: Through vegetative propagation using "eyes" (buds) on its underground stem

Question 7: Name a plant that produces new plantlets from the notches of its leaves.

Answer: Bryophyllum

Question 8: Why do flowers have brightly coloured petals and sweet nectar?

Answer: To attract insect pollinators like bees and butterflies