Unit 3 Key area 1

Question 1

Yellow pigments which absorb light and pass the energy to chlorophyll

Answer 1

Carotenoids

Question 2

Ability to access food of adequate quantity and quality

Answer 2

Food security

Question 3

Variety of plant obtained form natural species by selection and/or genetic manipulation and maintained by cultivation

Answer 3

Cultivar

Question 4

Techniques used to separate the components of a mixture that differ in their degree of solubility in a solvent

Answer 4

Chromatography

Question 5

Process by which green plants trap light energy and use it to produce carbohydrates

Answer 5

Photosynthesis

Question 6

Process by which light is taken in and retained by plants

Answer 6

Absorption

Question 7

Process by which light bounces off a leaf surface

Answer 7

Reflection

Question 8

Graph showing the rate of photosynthesis by a green plant at different wavelengths of light

Answer 8

Action Spectrum

Question 9

Display/graph showing the quantity of light absorbed by a pigment at different wavelengths of light

Answer 9

Absorption spectrum

Question 10

Term referring to a level in a food chain or pyramid

Answer 10

Trophic

Question 11

Green pigments which absorb light in the red and blue regions of the spectrum

Answer 11

Chlorophylls

Question 12

Large group of organic compounds that contain carbon, hydrogen and oxygen

Answer 12

Carbohydrates

Question 13

One thousand-millionth of a metre

Answer 13

Nanometre

Question 14

Metabolite in the Calvin Cycle which acts as the carbon dioxide acceptor

Answer 14

RuBP

Question 15

Breakdown of water during the light-dependent stage of photosynthesis

Answer 15

Photolysis

Question 16

Raw material which becomes split into oxygen and hydrogen during photolysis

Answer 16

Water

Question 17

Compound which accepts hydrogen released during the photolysis of water

Answer 17

NADP

Question 18

Second stage of photosynthesis during which carbon dioxide is taken up and sugar is synthesised

Answer 18

Calvin cycle

Question 19

Enzyme which catalyses the synthesis of ATP form ADP and Pi

Answer 19

ATP synthase

Question 20

Enzymes which fixes carbon dioxide by attaching it to RuBP

Answer 20

Rubisco

Question 21

High energy compound which provides the energy needed to drive the Calvin cycle

Answer 21

ATP

Question 22

Product of photolysis of water which becomes attached to NADP

Answer 22

Hydrogen

Question 23

Product of photolysis of water which is required for aerobic respiration

Answer 23

Oxygen

Question 24

First stage of phtotsynthesis during which light energy is converted to chemical energy

Answer 24

Light dependent reaction

Question 25

Metabolite in the Calvin cycle used to regenerate RuBP and make sugar

Answer 25

G3P

Question 26

Raw material which supplies carbon atoms to be fixed into carbohydrates

Answer 26

Carbon dioxide

Question 27

Group of protein molecules in the membrane of a chloroplast which makes energy available to pump H+ across the membrane and to split water molecules

Answer 27

Electron transport chain

Question 28

Process by which light passes though a leaf

Answer 28

Transmission