Biology Topic 6 Plants

Question 1

Word equation for photosynthesis

Answer 1

Carbon Dioxide + Water —–> Glucose + Oxygen

Question 2

Symbol equation for Photosynthesis

Answer 2

CO2 + H20 —> C6H12O6 + O2

Question 3

What is photosynthesis?

Answer 3

An endothermic reaction in which energy is transferred from the environment to the chloroplast by light

Question 4

`The effect of light intensity on Photosynthesis?

Answer 4

provides energy needed for photosynthesis, as light level is raised, photosynthesis increases up to a certain point

Question 5

What are the control variables RP6

Answer 5

Brightness of lamp, colour of light, Concentration of sodium hydro carbonate, Temperature, Length of Pondweed, species of pondweed

Question 6

independent and dependent variables of RP6

Answer 6

D- Number of bubbles of oxygen produced
I- Distance away from lamp

Question 7

What are ways we controlled variables in RP6?

Answer 7

• turned of lights in the room to reduce background light
• Controlled temperature with a room temperature water bath

Question 8

Method for RP6

Answer 8

-Fill a boiling tube 2/3 full of sodium hydrocarbonate solution
- Put boiling tube in room temperature water bath
- Cut a 7cm piece of pondweed and place it cut side up in tube
- Place beaker 10 cm away from lamp and leave for 5 minutes
- After, count number of bubbles produce in one minute
- Repeat at 20, 30, 40 and 50

Question 9

Effect of temperature on photosynthesis

Answer 9

Enzymes work slow at low temperatures, If too hot, enzymes will be damaged, increases up to a point

Question 10

Effect of Carbon Dioxide concentration on photosynthesis

Answer 10

CO2 is a raw material needed, increases up to a certain point

Question 11

Factors that affect the rate of photosynthesis

Answer 11

light intensity, CO2 concentration, temperature, amount of chlorophyll