B8 Photosynthesis

Question 1

For photosynthesis, what is the equation?

Answer 1

Water + carbon dioxide —> glucose + oxygen

Question 2

What is the symbol equation for photosynthesis?

Answer 2

H2 O +C O2 –> C6 H12 O6 + O2

Question 3

What is the balanced symbol equation for photosynthesis?

Answer 3

6H2 O + 6C O2 –> C6 H12 O6 + O2

Question 4

Explain how water is transported

Answer 4

The water is transported up stem in the xylem-the transpiration stream. The water is absorbed by roots

Question 5

Explain how Carbon-dioxide travels into of the leaf

Answer 5

CO2 diffuses into the leaves through the stomata

Question 6

Explain how gets out of the leaf

Answer 6

O2 diffuses away through the stomata. It is also used through respiration

Question 7

Explain glucose

Answer 7

Glucose is broken down using oxygen to provide energy for cells.

Plants build up glucose into complex carbohydrates such as cellulose. These are used to strengthen their cell walls.

Question 8

Explain Starch

Answer 8

Starch is stored in cells of leaves to provide an energy store for when it is dark

Question 9

Amino acids

Answer 9

Amino acids are built up into proteins to be used in the plant cells in many ways including enzymes.

Question 10

Explain fly-traps

Answer 10

Fly traps use nitrates and other minerals from the digested bodies in place of nutrients if they lack them.

Question 11

How has leaves adapted for photosynthesis?

Answer 11

• Most leaves have a big surface area for light to fall on.
• Leaves are relatively thin which means the diffusion of gases is easier.
• The leaf contains chloroplasts which contain chlorophyll which absorb light.
• The leaf has many veins to bring lots of water in the xylem to the cells.
• The leaf has air spaces that allow CO2 to get to the cells, and oxygen to leave by diffusion.
• The guard cells that open and close the stomata to regulate gases coming in and out.

Question 12

Explain the Light graph (rate of photosynthesis)

Answer 12

Starts of low, then increases but slows down.

Question 13

Explain the Temperature graph (rate of photosynthesis)

Answer 13

The graph starts off low, then increases until it reaches the optimum, then it decreases drastically.

Question 14

Explain the Carbon Dioxide Concentration graph (rate of photosynthesis)

Answer 14

The graph starts off low, then increases but levels of as it cannot speed up any more.

Question 15

What happens if light increases?

Answer 15

If there is lots of light, lots of photosynthesis can take place.

Question 16

What happens if light decreases?

Answer 16

If there is little to no light, no photosynthesis will take place.