Topic 2
The World of Plants
Standard Grade
Biology
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Growing Plants - Plant Science - Lecture Slides, Slides of Biology
This lecture series contains animal behavior, cereal, earthworm, fossils, growing plants, living factories, lower plant, mammals, natural vegetation, plant division and sharks. This lecture covers: Standard, Grade, Biology, Plants, Sed, Dissection, Investigation, Germinatoin, Temperature, Optimum, Flower, Pollination, Hayfever, fertilisation, Arrowroot.
Typology: Slides
2011/2012
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Topic 2
The World of Plants
Standard Grade
Biology
World of Plants is divided into:
A- Introducing plants
B- Growing plants
(Pollination, Fertilisation,
Asexual reproduction)
C- Making food
Seed Structure
• Parts are:
Seed coat Forms a tough protective layer
Food store Provides the embryo plant with food.
Embryo shoot
Embryo root
Embryo
- grows into plant
Seed Dissection
• Using a scalpel, carefully dissect your
seed in half lengthways.
• Draw a diagram of what you can see.
• Identify the parts,
and label your drawing
(workbook p13).
Investigation: Germination
• This is an Exam Board Investigation that
makes up part of your Practical
Abilities grade (20% of finals)
• Planning may be done in small groups
but after this you must work on your
own
• Write in your Investigation booklet.
What affects germination?
3Bio2 Brainstorm 16/03/
- Spacing / number of seeds
- Humidity / water volume
- Type of seeds
- Size of seeds
- Type of soil / mass
- Temperature
- Depth of planting
- Gases / oxygen levels
Measure by % germination after set time
Germination conditions
• Seeds need certain conditions to
germinate:
- Water
- to activate enzymes which digest stored food
- Oxygen
- Needed for the production of energy for germination
- Warmth
- Needed for the enzymes to work effectively.
- Germination is the development of a new
plant from the embryo in a seed.
Germination and Temperature
• The best temperature for germination
of a species of plant is known as the
optimum temperature.
• The optimum temperature is normally
between 15oC and 30oC.
Petal
Stigma Anther
Stigma Petals
Anther
Filament
Ovary
Sepals
Ovules Nectaries
Style
Collect a cut-out flower, colour it in and put it together.
Carpel
female
parts
Stamen male parts
Pollination
- Pollination involves the transfer of pollen
(male gamete ) from the anther to the stigma
(outermost female part)
- If it is in the same flower it is called
self-pollination.
- If between different flowers it is called
cross-pollination
- Plants are pollinated by insects or the wind.
Wind Pollinated Plants
Pollination Summary
Structure Wind
Pollinated
Insect
Pollinated
Petals
Pollen
Stamen
Stigma
nectar
dull
light
dangling
feathery
none
bright colour
sticky
inside flower
sticky
makes sugar