Plants - Class 6 Science Revision Notes

• Parts of a Plant
  • Flower
  • Male parts
  • Female Parts
• Pollination
  • Types of Pollination
• Germination
  • Types of Germination
  • Parts of a Seed

Parts of a Plant

Main parts of a plant are;

• Roots
• Stem
• Leaves

Flower

The main reproductive part of a plant is a flower.

Parts of a flower include;

• Male part
• Female part

Functions of Different Parts;

Male Parts

• Anthers; produce pollen grain(male cells)
• Filament; it supports the anthers

Female Parts

• Stigma; receives the pollen grains
• Style; holds the stigma
  Allow the development of pollen tube
• Ovary; holds the ovules
  Develops in a fruit
• Ovule; female cell
  Develops into seeds

Pollination

It is the transfer of pollen grains from the anthers to the
stigma of the same kind

Agents of pollination include;

• Wind
• Insects
• water

Types of Pollination

There are two types;

• Self pollination-it is the transfer of pollen grains from the anthers to the stigma of the same plant.
• Cross pollination-it is the transfer of pollen grains from the anthers to the stigma in different plants of the same type.

Characteristics of insect pollinated flowers

• They have nectar
• Brightly coloured
• Have big petals
• Sticky stigma
• Small amount of pollen grains

Characteristics of wind pollinated flowers

• Small in size
• Dull in colour
• Powderly pollen grains
• Produce large amount of pollen grains
• Loosely attached filaments

Germination

It is the change of the seed into a seedling

Conditions necessary for germination

• Air (oxygen)
• Moisture(water)
• Warmth(temperature)

Types of Germination

Epigeal germination; the seed comes out of the soil during germination e.g. Beans
Hypogeal germination; the seed remains in the soil during germination e.g. maize

Parts of a Seed

• Testa
• Helum
• Micropyle
• Cotyledon
• Radical
• Plumule.