1.

For plants to photosynthesize what do they need?

Carbon dioxide water sunlight                                

2.

What chemical could be used to take away carbon dioxide from a plant in a controlled test?

potassium hydroxide                                               

3.

If a plant is left in the dark for some time, what to the happens to the amount of starch stored?

amount of starch reduces                                               

4.

Minerals and vitamins are needed for healthy plant growth. How do they enter the plant?

dissolved in water through the roots                               

5. 

If a plant’s leaves become yellow and withered what elements could it be in need of?

iron magnesium, nitrogen, phosphorus, potassium, calcium

6.

What name is given to the process in which a living thing burns oxygen?

respiration                                                                                               

7.

Where does the oxygen come from'?

the air                                               

8.

How is the sun's energy transmitted to us

radiation                                               

9.

Neither plants or animals use the gas that makes up the most of air directly. What is it?

nitrogen                                                

10.

We breathe in oxygen through our lungs.  How does fuel we need enter our bodies?

We eat and then digest                               

11.

How is the fuel, oxygen arid waste gases moved around in our bodies?

Blood system                                                               

12.

How do the waste gases leave our bodies?

Through the lungs                                               

13

What are products of photosynthesis?

oxygen and starch                                               

14.

How can we test for carbon dioxide gas?

lime water turns milky                                      

15.

How can we test for oxygen gas?

a glowing relights – it relights

16.

What turns white copper sulphate blue?

water