B9: Plants As Organisms

Question 1

Where is CO2 absorbed?

Answer 1

The Leaves

Question 2

Adaptations for seed dispersal

Answer 2

> Fleshy, eaten by animals > Wings, fly away on wind > Hooks, caught in animal fur > Explosive pad to launch seeds far away

Question 3

Endosperm Nucleus

Answer 3

The nucleus of the female gamete that will form the food store (endosperm) when it’s fertilised.

Question 4

Photosynthesis Equation

Answer 4

6CO2 + 6H20 – (LIGHT ENERGY) -> C6H12O6 + 6O2

Question 5

When do plants respire?

Answer 5

24/7

Question 6

Is glucose insoluble?

Answer 6

No

Question 7

Is starch insoluble?

Answer 7

Yes

Question 8

Why do plants need nitrates?

Answer 8

To produce amino acids

Question 9

Root hair cell adaptations

Answer 9

> Microscopic hairs increase SA. > Lots of mitochondria for active transport.

Question 10

Waxy cuticle

Answer 10

Waterproof layer which stops water loss.

Question 11

Why is the spongy mesophyll not tightly packed?

Answer 11

To have a large SA for gas exchange.

Question 12

Transpiration

Answer 12

The loss of water from the leaves of plants through the stomata when they are open to allow gas exchange for photosynthesis.

Question 13

Transpiration Stream

Answer 13

The movement of water through a plant from the roots to the leaves as a result of the loss of water by evaporation from the surface of the leaves.

Question 14

Anything that affects evaporation also affects…

Answer 14

…Transpiration.

Question 15

What 3 weather conditions speed up transpiration?

Answer 15

Hot Dry Windy

Question 16

Translocation

Answer 16

The movement of sugars from the leaves to the rest of the plant.

Question 17

Phloem is…

Answer 17

…Alive

Question 18

Xylem is…

Answer 18

…Dead when mature.

Question 19

Vascular Bundles

Answer 19

A strand of conductive plant tissue consisting of xylem and phloem.

Question 20

Uses of plant growth hormones.

Answer 20

> Rooting Powder > Weed Killers

Question 21

7 uses of glucose in a plant.

Answer 21

> Respiration > Energy > Growth > Reproduction > Making cellulose > Making amino acids > Building fat and oil stores

Question 22

Where do plants store starch?

Answer 22

Leaves, Stems, Roots and Tubers

Question 23

Stomata

Answer 23

Openings in the leaves of plants which gases enter and leave the leaves through. They are opened and closed by guard cells.

Question 24

What is a potometer used for?

Answer 24

To show the water uptake of a plant under different conditions.

Question 25

Phototropism

Answer 25

The response of a plant to light.

Question 26

Gravitropism

Answer 26

The response of a plant to gravity.

Question 27

Hydrotropism

Answer 27

The response of a plant to water.

Question 28

What do auxins do?

Answer 28

Control a plants responses to light, gravity and water.

Question 29

Describe the fertilisation process.

Answer 29

1. The pollen grain attached to the stigma forms a pollen tube connecting it to the ovary. 2. The nuclei go through the pollen tube and fertilise the the egg and endosperm nuclei. 3. A zygote is formed-\> embryo -\> seed 4. The ovary grows into a fruit, which surrounds the seeds to protect them.

Question 30

In the shoot, more auxin gathers on the ..... side, and it grows faster on the ..... side.

Answer 30

lower lower

Question 31

3 limiting factors of photosynthesis.

Answer 31

Light Temperature CO2 levels

Question 32

Explain how CO2 is used in photosynthesis.

Answer 32

1. The CO2 enters the leaf. 2. It diffuses into the chloroplasts in the plant cells. 3. It bonds with water to create glucose 4. It is converted into starch for storage.

Question 33

Where is water absorbed?

Answer 33

In the roots

Question 34

In the shoot, more auxin gathers on the ..... side, and it grows faster on the ..... side.

Answer 34

lower opposite

Question 35

Where is light absorbed?

Answer 35

In the leaves

Question 36

Label the diagram

Answer 36

Question 37

Label the diagram

Answer 37

Question 38

Petals

Answer 38

Adapted to contain the sex organs.

Question 39

Sepals

Question 40

Stamens

Answer 40

The male part of a flower made up of the anthers and the filament.

Question 41

Anther

Answer 41

Makes pollen containing the male gametes of the plant.

Question 42

Filament

Answer 42

Attaches the anther to the flower.

Question 43

Carpel

Answer 43

The female parts of the flower made up of the stigma, style and ovary.

Question 44

Stigma

Answer 44

The part of the flower where pollen lands during pollination.

Question 45

Style

Answer 45

The part that transports the male sex cells to the ovary.

Question 46

Ovary

Answer 46

Female sex organ which contains the eggs.

Question 47

Ovules

Answer 47

The female gametes in a plant.