Biology Past Questions and Answers

(a) Explain how the leaf of a flowering plant is adapted for photosynthesis.
(b) Describe briefly the mode of feeding in tapeworm.
(c) Name one mineral element each needed for the proper functioning of :
(i) bones (ii) red blood cells
(iii) thyroid gland.
(d)(i) State three benefits of including roughages in the diet of humans.
(ii) State three reasons why proteins are important to humans.

(a)(i) What is sewage?
(ii) State five effects of releasing untreated sewage into a stagnant water body.
(b) Explain surface terracing as a soil conservation method.
(c) Explain the term adaptation.
(d) Explain two ways each by which the following organisms adapt to their habitats:
(i) hydrophytes
(ii) xerophytes.

(a) Explain the following terms:
(i) test cross
(ii) monohybrid cross.
(b) In a mango plant the, the allele for bean-shaped seed is r and is recessive to round-shaped seed R. With the aid of a genetic diagram, determine the genotypes of the offspring if:
(i) a homozygous bean-shaped parent with a homozygous round shaped parent;
(ii) a heterozygous bean-shaped parent is crossed with a heterozygous round shaped parent.

Flaccidity in plants is associated with

Flaccidity in plants is associated with