Photosynthesis

Question 1

metabolism

Answer 1

chemical processes in organisms controlled by enzymes

Question 2

anabolism

Answer 2

building up chemical reactions

Question 3

catabolism

Answer 3

breaking down chemical reactions

Question 4

iodine solution

Answer 4

chemical used to test for starch – a positive test results in the
colour changing from brown to blue-black

Question 5

autotrophic

Answer 5

green plants that produce their own food through
photosynthesis

Question 6

heterotrophic

Answer 6

organisms that cannot photosynthesize and obtain food from
other organisms

Question 7

The definition of photosynthesis

Answer 7

Is the process by which chloroplast of green plants absorb radiant energy from the Sun,carbon dioxide from the atmosphere and water from the soil to produce carbohydrates e.g glucose

Question 8

radiant energy

Answer 8

energy from the sun, needed by plants for photosynthesis

Question 9

chloroplast

Answer 9

Chlorophyll, containing plastid found In the cytoplasm of a plant cell

Question 10

chlorophyll

Answer 10

green pigment needed for photosynthesis

Question 11

thylakoids

Answer 11

part of the chloroplast that contains chlorophyll
part of the chloroplast that contains chlorophyll

Question 12

grana

Answer 12

stacks of thylakoids, light dependent phase of photosynthesis
takes place here

Question 13

stroma

Answer 13

liquid part of the chloroplast, light independent phase of
photosynthesis takes place here

Question 14

thylakoid

Answer 14

disc shaped membranes that that contain chlorophyll

Question 15

granum

Answer 15

a stack of thylakoids

Question 16

lamella

Answer 16

membranes that make up the thylakoids

Question 17

starch granule

Answer 17

glucose produced is stored as starch in this structure

Question 18

chloroplast DNA

Answer 18

contains genetic information

Question 19

double membrane

Answer 19

protects the chloroplast and allows substances to move
in and out

Question 20

The process of photosynthesis occurs in two phases:

Answer 20

 Light dependent phase: light is required
 Light independent phase: no light is required

Question 21

photolysis

Answer 21

splitting of water molecules into oxygen atoms and hydrogen
atoms. photo = light, lysis = split

Question 22

phosphorylation

Answer 22

formation of energy transporting molecules called ATP

Question 23

Calvin cycle

Answer 23

cyclical process during light independent phase of
photosynthesis

Question 24

ATP

Answer 24

adenosine triphosphate, energy carriers in cells

Question 25

glucose

Answer 25

carbohydrate formed during photosynthesis

Question 26

starch

Answer 26

stored form of glucose in plants

Question 27

glycogen

Answer 27

stored form of glucose in animals

Question 28

a short overview of the different phases of photosynthesis.

Answer 28

Light dependent phase ●Occurs in the grana ●Light is required ●Radiant energy is absorbed and used for the reactions of photolysis & phosphorylation ●Photolysis occurs: hydrogen is released and oxygen is returned to the atmosphere ●Phosphorylation occurs: ATP is produced Light independent phase ●Occurs in the stroma ●Light is not required ●Carbon dioxide is absorbed from the atmosphere ●Hydrogen and carbon dioxide combine by using atp to form glucose ●Excess glucose is stored as starch

Question 29

The importance of photosynthesis

Answer 29

● It balances the levels of carbon dioxide and oxygen in the atmosphere. ●The process uses carbon dioxide and releases oxygen. ● It uses radiant energy to produce chemical potential energy in the form of glucose which serves as food for other organisms. ● Proteins and lipids are made by using the stored starch.

Question 30

Environmental factors affecting the rate of photosynthesis

Answer 30

● The intensity of light ● The concentration of carbon dioxide ●The temperature

Question 31

greenhouse

Answer 31

a glass or plastic structure that traps heat and allows light to enter, used to grow plants

Question 32

greenhouse effect

Answer 32

phenomenon where heat from the sun is trapped on Earth by CO2 in the atmosphere