The World of Plants (B) Growing Plants. 1. Give the function of the following parts of a seed Seed...
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Transcript of The World of Plants (B) Growing Plants. 1. Give the function of the following parts of a seed Seed...
1. Give the function of the following parts of a seed
Seed coat
Embryo plantCotyledon
protection
grows into new plant
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 1 2 3 4
Conditions
Present
heat
light
moisture
heat
moisture
oxygen
heat
oxygen
moisture
water
Conditions
absentoxygen none water heat
Percentage
of seeds
germinated
0% 100% 0% 0%
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..
Answer:
What is the name given to the temperature at which seeds will germinate best at?
The optimum temperature.
5..
Answer: 20o
C
Below is table to show what percentage of seeds germinate at different temperatures. What is the optimum temperature for germination ?
Temp (oC)%
Germination0 015 5020 10025 4030 3035 8
6..
Answer:
Temp (oC)%
Germination0 015 5020 10025 4030 3035 8
Why was there no germination at 00C ?
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
Sepal
Anther
Nectary
colour / scent to attract insectsprotects the bud before it opens
produces pollen
contains nectar to feed insects
9..What is meant by pollination in a flowering plant?
The process by which pollen grains travel from anther to stigma.
Answer:
?
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.
Pollen is transferred from anther to stigma of a different flower.
b) Cross pollination means -
11..
What is the difference between wind pollination and insect pollination?
a) Wind Pollination means - Pollen grains are transferred by the wind.
Pollen grains are transferred by insects.
b) Insect pollination means -
12.. Below is a table comparing the structure of wind and insect pollinated flowers. Fill in the gaps.
Insect Pollinated Wind Pollinated
Petals small and greenPetals large and coloured
Sticky, spiky pollen Small, light pollen
Scented No scent
Usually produce nectar Never produce nectar
13..Below you will see a list of flowers. Which are insect pollinated and which are wind pollinated?
•Buttercup -
•Grass -
•Dandelion -
•Barley -
•Tulip -
•Lavender -
Insect
Insect
Insect
Insect
Wind
Wind
14..
•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.
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 seedswither and drop off
19..
•Dandelion -
•Bramble -
•Tomato -
•Burdock -
•Ash -
•Strawberry -
•Coconut -
By what method of dispersal are the following seeds scattered?
wind
animal internalanimal internalanimal externalwind
animal internal
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.
A potato -
A strawberry -
An onion -
What type of asexual reproduction do the following plants display?
tuber
runner
bulb
22.
“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.”
Which method of vegetative reproduction is the following statement describing?
Answer: A runner
23.Give some disadvantages of asexual reproduction.
Plants may be overcrowded
No variation of plant characteristics
Any undesirable characteristics will be passed on
Answer:
24.Give some of the advantages of asexual reproduction.
•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
Answer: