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The World of Plants (B) Growing Plants. 1. Give the function of the following parts of a seed Seed coat Embryo plant Cotyledon protection grows into new.

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Presentation on theme: "The World of Plants (B) Growing Plants. 1. Give the function of the following parts of a seed Seed coat Embryo plant Cotyledon protection grows into new."— Presentation transcript:

1 The World of Plants (B) Growing Plants

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

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

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

7 6.. Answer: Why was there no germination at 0 0 C ? Because it was too cold for the enzymes involved in germination to function.

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

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

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. Pollen is transferred from anther to stigma of a different flower. b) Cross pollination means -

12 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 -

13 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 green Petals large and coloured Sticky, spiky pollen Small, light pollen Scented No scent Usually produce nectar Never produce nectar

14 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 Wind

15 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.

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

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

18 17.. Answer : Name the structure which always contains the seeds. 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.. Dandelion - Bramble - Tomato - Burdock - Ash - Strawberry - Coconut - By what method of dispersal are the following seeds scattered? wind 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. A potato - A strawberry - An onion - What type of asexual reproduction do the following plants display? tuber runner bulb

23 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

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

25 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:

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


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