B2.2

Question 1

What is the word and symbol equation for photosynthesis?

Answer 1

Carbon dioxide+water->oxygen+glucose

CO2 + H2O -> O2 + C6H12O6

Question 2

What happens during photosynthesis?

Answer 2

Chlorophyll in chloroplast absorbs light energy which is then used to convert CO2 from the air + H2O from the soil into C6H12O6.
The chemical reaction produces oxygen as a by-product which is released into the air.

Question 3

What is some of the glucose made converted to?

Answer 3

Insoluble starch and stored.

Question 4

What can you use to find out if photosynthesis has taken place? How?

Answer 4

Iodine solution because it will turn the starch into a dark blue colour.

Question 5

Give 5 plant adaptations:

Answer 5

• leaves are broad giving them a big surface area
• contain chlorophyll to absorb light energy
• have air spaces that allow CO2 to get to the cells and oxygen to leave via diffusion
• have veins which bring plenty of water to the cells of the leaves

Question 6

What do plants need to grow?

Answer 6

Light
Warmth
Carbon dioxide

Question 7

How does light effect amount of photosynthesis?

Answer 7

The brighter the light, the faster the rate of photosynthesis.

Question 8

How does temperature effect the amount of photosynthesis?

Answer 8

It’s controlled by enzymes and most enzymes are destroyed once it reaches 40-50degrees.
If the temperature gets too high the enzymes denature.

Question 9

How does CO2 levels effect the amount of photosynthesis?

Answer 9

Increasing the CO2 levels will increase the rate of photosynthesis.
Atmosphere only contains 0.04% CO2.

Question 10

How do plants use glucose? What are the by-products?

Answer 10

They respire all the time and they use some of the glucose produced during photosynthesis.
Glucose is broken down using O2 to provide energy for the cells.
CO2 and H2O are the by-products.

Question 11

What is the energy released in respiration used for?

Answer 11

To build up smaller molecules in pro bigger molecules.

Question 12

How do plants make amino acids by using some of the glucose from photosynthesis?

Answer 12

Combining sugars and nitrate ions and other mineral ions from the soil.

Question 13

What is glucose, from photosynthesis, and energy, from respiration, used for?

Answer 13

Build up fats and oils.

Question 14

What would happen if glucose was stored in plant cells?

Answer 14

It would affect the way water moves into and out of the cells.

Question 15

What do may plants produce? What’s their purpose?

Answer 15

Tubers and bulbs which help them to survive through the winter.

Question 16

How can we make the most of photosynthesis? How is it used?

Answer 16

Having garden greenhouses which are used for growing crops.

Question 17

How does a greenhouse affect the rate of photosynthesis?

Answer 17

It’s much more controllable than outside therefore the atmosphere is is warmer inside which speeds up the plant growth.

Question 18

How can people control the rate of photosynthesis through technology?

Answer 18

Controlling the temperature and the levels of light and CO2.

These are varied to get the fastest possible rates of photosynthesis,

Question 19

What happens in the process of hydroponics?

Answer 19

Plants are grown in water with a perfect balance of mineral ions instead of soil.

Question 20

What factors affect how living organisms are distributed in the environment? How does it affect it?

Answer 20

Temperature-limiting factor on photosynthesis therefore growth in plants
Nutrients-level of mineral ions has a big impact on distribution of plants
Amount of light-limits photosynthesis so also affects distribution of plants and animals (more chlorophyll or bigger leaves)
+water,oxygen,carbon dioxide

Question 21

Name two ways to measure the distribution of organisms:

Answer 21

Quadrats-simplest way to sample an area

Transects-most commonly used

Question 22

What is quantitative sampling used for?

Answer 22

To compare the distribution of the same organism in different habitats.
To compare the variety of organisms in a number of different habitats.
To measure changed in the distribution of organisms over time.

Question 23

What is meant by reproducible data?

Answer 23

Other people can do the same investigation and get similar or same results as yours.

Question 24

What is meant by valid data?

Answer 24

Must answer the question you are asking.