The World of Plants

(B) Growing Plants

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

8.. What is the definition of fertilisation?

Joining together the male and female gamete.

Answer:

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.

15..

Answer:

What term describes the pollen nucleus joining with the ovule nucleus ?

Fertilization

16..

Answer:

Where does fertilization take place in a plant?

In the ovary

17..

Answer:

Name the structure which always contains the seeds.

A fruit

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:

•How many of the questions did you answer correctly?

•If you got any wrong, go back to the beginning and try again!