Topic Test- Plants(Diseases, Defences, Photosynthesis)

Question 1

What is a control variable?

Answer 1

the thing that doesn’t change.

use key terminology like volume and mass NOT amount

Question 2

What is an independent variable?

Answer 2

the thing that changes

Question 3

What is a dependent variable?

Answer 3

the thing you measure

Question 4

What are the physical barriers?

Answer 4

waxy cuticle
cellulose cell wall
bark on the tree
leaf fall

Question 5

what is the function of the waxy cuticle?

Answer 5

keeps the plant tough so acts as a physical barrier

Question 6

what does the cellulose cell wall do?

Answer 6

keeps the plant strong

Question 7

what does bark on the tree do?

Answer 7

gives strength and toughness to a tree to prevent anything entering

Question 8

what is a chemical barrier?

Answer 8

releasing antibacterial chemicals to kill any diseases

Question 9

how do plants deter herbivores from eating them as an act of defence?

Answer 9

• changes colour to appear poisonous
• droops with contact to appear dead or unhealthy
• having thorns
• having hairy stems

Question 10

What is a specialised cell?

Answer 10

A cell that he adapted to a specific function

Question 11

what are the main 4 plant organs?

Answer 11

• roots
• stem
• leaf
• flower

Question 12

what is the function of epidermal tissue?

Answer 12

covers the surface of the plant to protect them

Question 13

how has the epidermal tissues adapted to its function?

Answer 13

they often secrete a waterproof waxy substance to keep the surface of the leaf protected

Question 14

what is the function of the palisade mesophyll?

Answer 14

to carry out photosynthesis

Question 15

how has the palisade mesophyll adapted to its function?

Answer 15

by having a lot of chloroplasts

Question 16

what is the function of spongey mesophyll?

Answer 16

to diffuse gasses and to perform some photosynthesis

Question 17

how has spongey mesophyll adapted to its function?

Answer 17

• contains some chloroplasts to aid photosynthesis

- large surface area and large air spaces to aid the gas exchange

Question 18

what is the function of xylem?

Answer 18

to carry water and dissolved minerals through the roots to the leaf

Question 19

how has the xylem adapted to its function?

Answer 19

they are dead tissue so it hollows out allowing water to travel faster through it

Question 20

what is the function of phloem?

Answer 20

to carry dissolved food up through the roots to the leaf

Question 21

how has phloem adapted to its function?

Answer 21

the cell walls break down to form special sieve plates which allows dissolved food to move more freely

Question 22

what is translocation?

Answer 22

the movement of materials from leaves to other tissues throughout the plant

Question 23

What does the stomata do?

Answer 23

allows gasses to come in and out the cell (oxygen and CO2)

Question 24

What do guard cells do?

Answer 24

control the opening and closing of stomata

Question 25

what is transpiration?

Answer 25

when the stomata is open, it allows water vapour to be lost and that loss of water is called transpiration

Question 26

what factors increase the rate of transpiration?

Answer 26

• hot conditions
• windy conditions
• dry conditions
• light intensity

Question 27

what factor decreases transpiration?

Answer 27

-humidity

Question 28

what factors increase the rate of photosynthesis?

Answer 28

• light intensity
• temperature
• carbon dioxide amount

Question 29

what is the equation for photosynthesis?

Answer 29

carbon dioxide + water ——> oxygen + glucose

Question 30

what does photosynthesis require?

Answer 30

• water
• sunlight
• carbon dioxide

Question 31

what is the chemical equation for photosynthesis?

Answer 31

H20 + CO2 —> 02 + C6H12O6

Question 32

where does photosynthesis occur?

Answer 32

• in the palisade mesophyll

- more specifically the chloroplasts

Question 33

what ways do plants use glucose for strength?

Answer 33

• plants build up globose into complex carbohydrates such as cellulose
• cellulose is then used for strength