Download Reproduction in Plants - Amazing World of Science with Mr. Green

IGCSE Biology
YR 10
Plant
Reproduction
Name: ____________________________
Prepared by William Green
DBGS 2011
Glossary
Nucleus
Chromosomes
DNA
Genetic Code
Inherited
Gene
Gametes
Fertilisation
Part of the cell which contains chromosomes
Structures in the nucleus that are made from a chemical
called DNA
A chemical that contains the code for the characteristics of
an organism (e.g. what that organism will look like).
The coded instructions contained in DNA which give the
organism its inherited characteristics
Passed on from parent to offspring
A section of a chromosome that codes for one characteristic.
E.g. eye colour
Another name for sex cells. They only contain half of the
genetic code compared to normal body cells.
The joining of the two gametes. This is the start of a new
life.
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Reproduction
1. What is reproduction?
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2. What are the two types of reproduction?
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3. Asexual reproduction produces new offspring without the fusion of
______________. The offspring are _____________________ to the parent
plant.
4. What are the different types of asexual reproduction?
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5. In sexual reproduction both the _____________ and ______________
parent carry ________________. The male sex cell in plants is called the
______________ and the female sex cell is called the _______________.
These two sex cells are also called ____________________.
6. Pollination occurs when the ________________ transfer to the
________________. Fertilisation occurs when a __________ is formed. The
male and female sex cells are produced by ________________ in the
structure of the flower.
Parts of a flower
Label this flower and give the definition of each part below:
Stamen = _______________________________________________________________
Anther = _______________________________________________________________
Filament = ______________________________________________________________
Carpel = ________________________________________________________________
Stigma = _______________________________________________________________
Style = _________________________________________________________________
Ovary = ________________________________________________________________
Ovule = ________________________________________________________________
Pollination
1. Pollination occurs when the_________________________ is released from
the _________________________ and land on the __________________
2. What are the two methods flowers are pollinated?
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3. Compare and contrast wind and insect pollinated flowers:
Insect Pollinated flower
Wind pollinated flower
Large, coloured petals to attract insects
No scent (they don’t smell!)
Contain nectar to attract the insects
Anthers are inside the flower where
insects have to brush past them to get
to the nectar inside
Stigma is large and feathery and hangs
outside the flower to catch pollen in the
air.
Flowers only appear in warm weather
when there are insects around
4. True or false? Pollination is basically the same as fertilisation
Write out the correct version below:
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5. How does cross pollination differ from self pollination?
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6. Why is it preferable for a plant to encourage cross-pollination rather than
self pollination?
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Fertilisation
1. Annotate this diagram to explain what happens during fertilisation.
2. Add “Zygote” and “Embryo” to your glossary list.
3. The zygote turns into the ________________
4. The ovary turns into the __________________
5. Water is removed from the seed in order to ______________________
activity and let the seed ________________________
Seed Dispersal
1. Any structure that contains a seed is a ____________________
2. What is the function of fruits?
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3. Why is seed dispersal important?
a. __________________________________________________________
b. __________________________________________________________
4. What sorts of things will plants compete with each other for? List as
many as you can __________________________________________________
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5. Describe in as much detail as you can how plants disperse their seeds:
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Seed structure
1. What do seeds contain?
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2. What will the radicle grow in to? ________________________________________
3. What will the plumule grow in to? ______________________________________
4. What will the hypocotyls grow in to? ____________________________________
5. What are the cotyledons? ______________________________________________
6. What is the testa? _____________________________________________________
7. What is the microyple? ________________________________________________
8. Seeds with two cotyledons are
called
____________________________.
Seeds with one cotyledon are
called
_________________________
9. Label these diagrams of the seed:
Germination
1. What is germination? ______________________________________________
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2. What is the first thing to happen in germination? ______________________
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3. Complete the germination diagram
4. Explain how these factors affect germination:
Water
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Oxygen
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Temperature
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Light
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