Biogenetics' part 1

Question 1

What is photosynthesis?

Answer 1

When plants make use of the sun’s energy to make food (glucose)

Question 2

Process of photosynthesis

Answer 2

Plant manufactures glucose from carbon dioxide.
Water using energy transferred from the environment to the chloroplast by light

Question 3

What reaction is photosynthesis?

Answer 3

endothermic

Question 4

Word equation photosynthesis

Answer 4

carbon dioxide +water arrow light glucose + oxygen

Question 5

symbol equation photosynthesis

Answer 5

6CO2 + 6H2O arrow light C6H12O6 + 6O2

Question 6

Molecule for each

Answer 6

Carbon dioxide=CO2
Water=H2O
Oxygen=O2
Glucose=C6H12O6

Question 7

What is limiting factor?

Answer 7

Is something that restricts or slows down the biological process

Question 8

what is the possible limiting factors for photosynthesis?

Answer 8

Light intensity
temperature
chlorophyll

Question 9

How does temperature affects photosynthesis?

Answer 9

when temperature is used speeds up the chemical reaction.

Question 10

What happens if the temperature rises too much?

Answer 10

Enzymes will denatured and the rate of reaction will decrease

Question 11

How does the amount of light effect photosynthesis?

Answer 11

If there is more light the plant will grow
If not then it won’t grow as tall and slows the rate of photosynthesis

Question 12

Photosynthesis required practical

Answer 12

1. Fill a boiling tube with 0.2% sodium
   hydrogen carbonate solution.
2. Freshly cut a 10 cm piece of pondweed and
   place it in the boiling tube with the cut end
   at the top.
3. Set up an LED lamp at a distance of 10 cm to
   the boiling tube and leave to settle for 5
   minutes.
4. Start the stopwatch and count the number of
   bubbles released in one minute.
5. Repeat twice and calculate the mean number
   of bubbles.
6. Repeat steps 1-6, altering distance of the
   lamp so it is 30 cm, 40 cm and 50cm away
   from the boiling tube.

Question 13

What is the inverse square law?

Answer 13

If you double the distance between the plan and the light source you quarter the light intensity

Question 14

Where is the energy transferred from the environment?

Answer 14

Chlorophyll

Question 15

How do farmers control conditions of plants inside greenhouses?

Answer 15

Heating
Artificial lighting
Extra carbon dioxide

Question 16

What are the uses of glucose?

Answer 16

Produce cellulose, strengthens plant cell wall.

Converted into insoluble starch

Converted to amino acids for protein synthesis

Produce fat and oil for storage