Photosynthesis

Question 1

Is photosynthesis an endothermic or exothermic reaction?

Answer 1

Endothermic

Question 2

Why is photosynthesis an endothermic reaction?

Answer 2

Light energy is being transferred from the environment to the chloroplasts

Question 3

What is the word equation for photosynthesis?

Answer 3

Carbon dioxide + Water → Glucose + Oxygen

Question 4

What are the reactants in photosynthesis?

Answer 4

Carbon dioxide + Water

Question 5

What are the products in photosynthesis?

Answer 5

Glucose + Oxygen

Question 6

What is the symbol equation for photosynthesis?

Answer 6

CO₂ + H₂O → C₆H₁₂O₆ + O₂

Question 7

What is the source of energy in photosynthesis?

Answer 7

Light

Question 8

What is light absorbed by for photosynthesis

Answer 8

The chlorophyll

Question 9

Name the four limitng factors which affect the rate of photosynthesis

Answer 9

1. Light intensity
2. Temperature
3. Concentration of Carbon Dioxide
4. Amount of chlorophyll

Question 10

What is a limiting factor?

Answer 10

A factore that when in shortage, slows down the rate of photosynthesis

Question 11

How can you tell that a factor is the limiting factor?

Answer 11

As the factor increases the rate of photosynthesis increases

Question 12

How can you tell when a factor is no longer the limitng factor?

Answer 12

As the factor continues to increase and become abundant the rate of photosynthesis remains constant- so something elese is now the limiting factor

Question 13

Why do farmers want to increase the rate of photosynthesis of their plants?

Answer 13

To increase their crop yield

Question 14

How do farmers increase their crop yield through photosynthesis?

Answer 14

They add light, heat and extra carbon dioxide to their greenhouses

these are all factors which affect the rate of photosynthesis

Question 15

What problems do farmers face while trying to increase their crop yield?

Answer 15

It is expensive to add light, heat and extra CO₂ to their greenhouses

Question 16

How do farmers tackle the problem of extra cost while trying to increase their crop yield?

Answer 16

Some farmers use oil burners to release heat and carbon dioxide at the same time

remember, hydrocarbons=oil=there’s CO2 and burning =heat

Question 17

Why is a very high temperature not good for photosynthesis?

Answer 17

A very high temperautre will denature the enzymes in the leaf- this will reduce the rate of photosynthesis

Question 18

How do chloroplasts assist with the process of photosynthesis?

Answer 18

Chloroplasts contain chlorophyll
Chlorophyll absorbs light energy
Which is required for photosynthesis
To produce glucose

Question 19

Name 3 benefits of growing plants inside a greenhouse

Answer 19

1. Reduces the risk of spreading disease
2. Reduces competition with weeds
3. Fertiliser can be added to the soil