Topic 6 Plants

Question 1

What is photosynthesis?

Answer 1

Photosynthesis is the process that plants and algae us to make their own food.
Biomass is the mass of living material at a particular stage in a food chain.
Carbon dioxide+ water-> glucose+ oxygen

Question 2

What are the limiting factors on photosynthesis?

Answer 2

Temperature
Carbon dioxide concentration
Dim light

Question 3

What is the light intensity method?

Answer 3

Method:
1. Place 20 agals balls and the same volume of indicator solution in each tube, and replace the screw tops
2. Check the colour of the indicator against the colour chart and record the starting pH
3. If using a hot lamp, place the water tank next to the lamp
4. Measure the distance and ph of each tube

Question 4

What is the phloem?

Answer 4

Phloem contains sieve tube elements which have very little cytoplasm so that there is a lot of space to transport sucrose and other nutrients

Question 5

What is the function of the xylem?

Answer 5

Xylem are dead cells which have no cytoplasm or cell contents. This means there is more space for water containing mineral ions to move through. The walls are strengthened with lignin rings, which makes them very strong and prevents them from collapsing.

Question 6

What is transpiration?

Answer 6

Transpiration is the loss of water by evaporation from the leaves. The movement of water from the roots to the leaves is called the transpiration stream.

Question 7

What is translocation?

Answer 7

Translocation is the transport of sucrose around a plant

Question 8

What are the factors that affect transpiration?

Answer 8

Light intensity- high light intensity causes the stomata to open. This increases the rate of evaporation of water from the leaf
Temperature- the higher the temperature the more energy water molecules have