Bioenergetics for plants

Question 1

What is photosynthesis?

Answer 1

The process in the plant converting carbon dioxide and water via sunlight to glucose and oxygen

Question 2

Word equation for photosynthesis

Answer 2

Carbon dioxide +water+energy= glucose and oxygen

Question 3

What does the plant use glucose for

Answer 3

For respiration

Making cellulose which strengthens the plant

Stored as starch ready to use when photosynthesis cannot occur

Making amino acids . When glucose is combined with nitrate ions it makes proteins for the cell

Question 4

Pondweed practical

Answer 4

Place a source of white light at a specific distance shining on the pond weed

Let the plant photosynthesis for a specific amount of time . Collect the oxygen produced via a capillary tube

Then use a gas syringe to remove the oxygen . Place a ruler next the syringe so that we can measure the volume of oxygen produced

Repeat the experiment changing the distance of the light source

Question 5

Why is distance and light intensity proportional

Answer 5

As distance increases intensity will decrease

Question 6

How do you calculate light intensity

Answer 6

1/ distance squared

Question 7

How do greenhouses create the ideal environment for plants

Answer 7

They trap the suns heat and makes sure that the temperature does not become a limiting factor.

Question 8

How can you increase the levels of carbon dioxide for a plant

Answer 8

Use a paraffin heater . As the paraffin is burnt one of the byproducts is carbon dioxide

Question 9

Equation for photosynthesis

Answer 9

Carbon dioxide + water + light = glucose + oxygen

6CO2 + 6H2O = C6H12O6 + 6O2