Tuesday, 21 September 2021 07:41

Plants - Class 6 Science Revision Notes

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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.

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