Photo. & Bio. Sht_3
This Homework requires GRAPH PAPER!
1. The diagram opposite shows part of a pond food web.
All the tadpoles were removed. Use the words increase, decrease or stay the same to suggest what might happen to the
a)minnows and
b)water beetles.
For each case explain your answer.
c) Choose a food chain from the food web above. Draw and label a pyramid of numbers and a pyramid of biomass.
2. Why must there be more organisms at the bottom of the pyramid of numbers than at the top?
3. What happens to the size of the organism as you move along the food chain?
4. Which of the following is an abiotic factor, affecting where organisms are found?
a) food b) disease c) light d) predators
5. What piece of apparatus would you use to measure this abiotic factor?
6. Name another two abiotic factors.
7. The table below shows the changes in numbers of pond skaters in a year.
a) Use the information to draw a line graph.
b) What happens to the numbers of pond skaters from January to July?
c) During which two months is the number of pond skaters at their lowest?
d) Suggest a reason for the low numbers in these two months.
e) Suggest what the pond skaters have to compete for during the months of July and August?
