Photo. & Bio. Sht_2
1. What are the two products of photosynthesis?
2. 
Fred and Holly used the set up shown above to investigate photosynthesis under different conditions. They counted the number of oxygen bubbles per minute, but foolishly did not prepare a table for their results. The three values would they obtained are written below.
Choose the most suitable value from the list for each of the three situations, listed below which they investigated.
3. What do the arrows in a food chain show us?
4. Here are some food chains, use them to make a food web.
green algae ➞ midges ➞ net spinning caddis fly ➞ frog
green algae ➞ midges ➞ pond skater
green algae ➞ black fly ➞ net spinning caddis fly ➞ frog
green algae ➞ black fly ➞ net spinning caddis fly
a) What does every food chain begin with?
5. Look at this food web.
Write down as many food chains as you can find.
