Transcript Answer

The World of Plants
(B) Growing Plants
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
2.
In the following experiment to investigate conditions for
germination of cress seeds, what conclusion do you come to?
Tube
Conditions
Present
Conditions
absent
1
2
3
4
heat
heat
light
moisture
heat
moisture
moisture
oxygen
oxygen
w ater
oxygen
none
w ater
heat
0%
100%
0%
0%
Percentage
of seeds
germinated
Answer:
•Seeds need oxygen, water and heat to germinate
•Seeds do not need light to germinate
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.
4..
What is the name given to the temperature
at which seeds will germinate best at?
Answer:
The optimum temperature.
5..
Below is table to show what percentage of seeds
germinate at different temperatures. What is the
optimum temperature for germination ?
o
Temp ( C)
0
15
20
25
30
35
Answer:
%
Germination
0
50
100
40
30
8
20oC
6..
Why was there no germination at 00C ?
o
Temp ( C)
0
15
20
25
30
35
Answer:
%
Germination
0
50
100
40
30
8
Because it was too cold for the
enzymes involved in germination to
function.
7..
Give the function of each of the following
parts of a flowering plant
Petal
colour / scent to attract insects
Sepal
protects the bud before it opens
Anther produces pollen
Nectary contains nectar to feed insects
8..
What is the definition of fertilisation?
Answer:
Joining together the male and female
gamete.
9..
What is meant by pollination in a
flowering plant?
Answer:
?
The process by which pollen
grains travel from anther to
stigma.
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.
11..
What is the difference between wind
pollination and insect pollination?
a) Wind Pollination means Pollen grains are transferred by the wind.
b) Insect pollination means Pollen grains are transferred by insects.
12.. Below is a table comparing the structure of wind and
insect pollinated flowers. Fill in the gaps.
Insect Pollinated
Petals large and coloured
Sticky, spiky pollen
Scented
Usually produce nectar
Wind Pollinated
Petals small and green
Small, light pollen
No scent
Never produce nectar
13..
Below you will see a list of flowers. Which are
insect pollinated and which are wind pollinated?
•Buttercup •Grass
Insect
- Wind
•Dandelion - Insect
•Barley
- Wind
•Tulip
- Insect
•Lavender - Insect
14..
•The pollen grain lands on the________
stigma.
• The male sex cell is inside the pollen
__________
and grows a tube down through the _________
style
ovary.
to reach the female sex cell in the________
15..
What term describes the pollen nucleus
joining with the ovule nucleus ?
Answer:
Fertilization
16..
Where does fertilization take place in a
plant?
Answer:
In the ovary
17..
Name the structure which always
contains the seeds.
Answer:
A fruit
18..
After fertilisation what do the following
parts of the flower become?
The flower stalk becomes.. the fruit stalk
The ovary becomes..
the fruit
The ovules become..
the seeds
The petals,stamen,stigma.. wither and drop off
19..
By what method of dispersal are the
following seeds scattered?
•Dandelion - wind
animal internal
•Bramble
-
•Tomato
- animal internal
•Burdock
- animal external
- wind
•Ash
•Strawberry - animal internal
•Coconut
- water
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
21.
What type of asexual reproduction do the
following plants display?
A potato
-
tuber
A strawberry -
runner
An onion
bulb
-
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
23.
Give some disadvantages of asexual
reproduction.
Answer:
Plants may be overcrowded
No variation of plant characteristics
Any undesirable characteristics will be passed on
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
•How many of the questions did you
answer correctly?
•If you got any wrong, go back to the
beginning and try again!