(a)(i) What is an ecological niche?

 (i) State five roles played by a mango tree in its ecological niche.

(b)i) State two reasons why ecologists use sampling techniques in population studies.

(i) State four examples of sampling techniques used in population studies.

(c)Name four types of fingerprints in humans.

(d)) Name the plant used by Gregor Mendel in his experiment.

(ii) State two reasons why the plant named in 3(d) was used.