B1.4

Question 1

Relative light intensity

Answer 1

The distance of a light source compared to the strength of the light. Light intensity is inversely proportional to the square of the distance. 1/(distance from light source)^2

Question 2

Inverse square law

Answer 2

When you double the distance from a light source, the light intensity falls by a factor of 4. y is proportional to 1/x^2

Question 3

Chlorophyll

Answer 3

Green pigment in chloroplasts which trap energy from the sun

Question 4

Rate of photosynthesis

Answer 4

1/t

Question 5

Limiting factor

Answer 5

Factor which can prevent an increase in the rate of photosynthesis

Question 6

Starch

Answer 6

A compound of glucose molecules used as a food store

Question 7

Producers

Answer 7

Organisms that make their own food through the process of photosynthesis

Question 8

Photosynthesis

Answer 8

Process by which producers make food

Question 9

Biomass

Answer 9

The total mass of organisms in a given area

Question 10

Endothermic

Answer 10

A chemical reaction in which energy is transferred from the surrondings to the reacting mixture

Question 11

Stage 1

Answer 11

Light dependent stage where the energy transferred from light splits water into oxygen and hydrogen ions

Question 12

Stage 2

Answer 12

Light independent stage where carbon dioxide combines with hydrogen ions to create glucose

Question 13

Stomata

Answer 13

Small openings (pores) in a plants epidermis used to exchange gases

Question 14

Carbon dioxide

Answer 14

A reactant in photosynthesis comprised of 2 oxygen molecules and 1 carbon molecule

Question 15

Temperature

Answer 15

A measure of the heat of something

Question 16

Law of limiting factors

Answer 16

When a process depends on 2 or more factors the rate of that process is limited by the factor which is in the shortest supply