1. The World of Plants
(B) Growing Plants

2. 1. Give the function of the following parts of a seed Seed coat
protection
Embryo plant
grows into new plant
Cotyledon
food store until the first green leaves appear

3. 2. Answer: Seeds need oxygen, water and heat to germinate
In the following experiment to investigate conditions for germination of cress seeds, what conclusion do you come to?
Answer:
Seeds need oxygen, water and heat to germinate
Seeds do not need light to germinate

4. 3..
Why can a large seed be planted deeper in the ground than a small seed?
Answer:
If a small seed was planted too deeply in the ground it would use up its food store (in the cotyledon) before the first green leaves appeared.

5. 4..
What is the name given to the temperature at which seeds will germinate best at?
The optimum temperature.
Answer:

6. 5..
Below is table to show what percentage of seeds germinate at different temperatures. What is the optimum temperature for germination ?
Answer:
20oC

7. 6.. Why was there no germination at 00C ?
Answer:
Because it was too cold for the enzymes involved in germination to function.

8. 7.. Petal Sepal Anther Nectary
Give the function of each of the following parts of a flowering plant
Petal
Sepal
Anther
Nectary
colour / scent to attract insects
protects the bud before it opens
produces pollen
contains nectar to feed insects

9. 8.. Joining together the male and female gamete.
What is the definition of fertilisation?
Answer:
Joining together the male and female gamete.

10. ? 9.. The process by which pollen grains travel from anther to stigma.
What is meant by pollination in a flowering plant?
Answer: ?
The process by which pollen grains travel from anther to stigma.

11. 10..
What is the difference between self pollination and cross pollination?
a) Self Pollination means -
Pollen is transferred from anther to stigma of the same flower.
b) Cross pollination means -
Pollen is transferred from anther to stigma of a different flower.

12. 11..
What is the difference between wind pollination and insect pollination?
Wind Pollination means -
Pollen grains are transferred by the wind.
b) Insect pollination means -
Pollen grains are transferred by insects.

13. 12.. Insect Pollinated Wind Pollinated Petals large and coloured
Below is a table comparing the structure of wind and insect pollinated flowers. Fill in the gaps.
Insect Pollinated
Wind Pollinated
Petals large and coloured
Petals small and green
Small, light pollen
Sticky, spiky pollen
Scented
No scent
Usually produce nectar
Never produce nectar

14. 13.. Buttercup - Grass - Dandelion - Barley - Tulip - Lavender -
Below you will see a list of flowers. Which are insect pollinated and which are wind pollinated?
Buttercup -
Grass
Dandelion -
Barley
Tulip
Lavender -
Insect
Wind
Insect
Wind
Insect
Insect

15. 14.. stigma. The pollen grain lands on the________
The male sex cell is inside the __________
and grows a tube down through the _________
to reach the female sex cell in the________
stigma.
pollen
style
ovary.

16. 15..
What term describes the pollen nucleus joining with the ovule nucleus ?
Answer:
Fertilization

17. 16.. In the ovary Where does fertilization take place in a plant?
Answer:
In the ovary

18. 17.. A fruit Name the structure which always contains the seeds.
Answer:
A fruit

19. 18..
After fertilisation what do the following parts of the flower become?
The flower stalk becomes..
The ovary becomes..
The ovules become..
The petals,stamen,stigma..
the fruit stalk
the fruit
the seeds
wither and drop off

20. 19.. By what method of dispersal are the following seeds scattered?
Dandelion -
Bramble
Tomato
Burdock
Ash
Strawberry -
Coconut
wind
animal internal
animal internal
animal external
wind
animal internal
water

21. 20. What is meant by asexual reproduction? Answer:
Only one parent involved
No sex cells produced
Producing new plants without forming seeds
No pollination involved

22. 21. What type of asexual reproduction do the following plants display?
A potato
A strawberry -
An onion
tuber
runner
bulb

23. 22.
Which method of vegetative reproduction is the following statement describing?
“special stems grow out from the parent plant and when they make contact with the earth, roots begin to grow. In time a new plant is produced.”
Answer:
A runner

24. 23. Give some disadvantages of asexual reproduction. Answer:
Plants may be overcrowded
No variation of plant characteristics
Any undesirable characteristics will be passed on

25. 24. Give some of the advantages of asexual reproduction. Answer:
Rapid growth – available food stores from parent
No vulnerable stages of germination and early seed growth
Colonies of the same kind of plant will form – no room for competition

26. How many of the questions did you answer correctly?
If you got any wrong, go back to the beginning and try again!