Unit 6 - Photosynthesis

Question 1

the gas in the air used by plants to make food. It is produced during respiration, by burning fossil fuels or by acids reacting with metal carbonates.

Answer 1

carbon dioxide

Question 2

a gas in the air that is produced by plants, used during aerobic respiration and during combustion reactions

Answer 2

oxygen

Question 3

a simple sugar molecule

Answer 3

glucose

Question 4

the process by which energy from sunlight, carbon dioxide and water are used by green plants to produce glucose and oxygen

Answer 4

photosynthesis

Question 5

a large molecule made by plants as a form of food storage

Answer 5

starch

Question 6

orange coloured liquid used to test for starch

Answer 6

iodine

Question 7

green pigment in plants used in photosynthesis

Answer 7

chlorophyll

Question 8

waxy, waterproof, protective outer layer of a leaf

Answer 8

cuticle

Question 9

single-cell thick transparent layer in the upper surface of a leaf

Answer 9

epidermis

Question 10

a long narrow plant cell, packed with chloroplasts and found in the upper part of the leaf

Answer 10

palisade cell

Question 11

a plant cell with a large surface area, large spaces around it and found in the lower part of the leaf

Answer 11

spongy cell

Question 12

a very small hole

Answer 12

pore

Question 13

tiny pores on the underneath surface of a leaf through which gases can move in and out

Answer 13

stomata

Question 14

leaf cells either side of each stoma which control its opening and closing

Answer 14

guard cells

Question 15

a measure of speed or the number of times something happens in a set amount of time

Answer 15

rate

Question 16

the number of particles packed in a certain volume

Answer 16

concentration

Question 17

movement of water in plants as it is taken up through the roots and released from the leaves as water vapour

Answer 17

transpiration

Question 18

cells that join to form a pipeline in the stem of the plant through which water and minerals travel

Answer 18

xylem cells

Question 19

specialised plant cells on roots

Answer 19

root hair cells

Question 20

lack of something such as a nutrient

Answer 20

deficiency

Question 21

chemical put on soil to increase soil fertility and allow better growth of crop plants

Answer 21

fertiliser

Question 22

waste organic material

Answer 22

manure

Question 23

energy from chemicals is used to make food

Answer 23

chemosynthesis

Question 24

forms on the sea floor where there is volcanic activity

Answer 24

hydrothermal vent