Biology past questions

(a) Explain briefly the term excretion

(b) Name two excretory products each of :

i. mammals

ii. plants

(c) Complete the table bellow

(d) State three functions of the kidney in humans.

2. (a) State two differences between photosynthetic mode of nutrition and chemosynthetic mode of nutrition.

(b) i. What are saprophytes ?

ii. Give two examples of saprophytic organisms iii. Explain briefly the mode of feeding in saprophytes.

iv. State three ways by which saprophytes are of economic importance.

(c) State three characteristic features of carnivorous plants.

(d) State the feeding habit of:

i. butterfly; ii. mosquito larva; iv. housefly.

iii. mucor;

(a) State two differences between photosynthetic mode of nutrition and chemosynthetic mode of nutrition.

(b) i. What are saprophytes ?

ii. Give two examples of saprophytic organisms

iii. Explain briefly the mode of feeding in saprophytes

iv. State three ways by which saprophytes are of economic importance.

(c) State three characteristic features of carnivorous plants.

(d) State the feeding habit of:

i. butterfly; ii. mosquito larva; iii. mucor; iv. housefly.

(a) Explain briefly how carbon (IV) oxide and oxygen are balanced in nature.

(b) List five factors that affect the distribution of plants in their habitats.

(c) i. What is overcrowding in an ecosystem?

ii. List five effects of overcrowding in an eco- system.

(d) i. Distinguish between density-dependent factors and density-independent factors in an ecosystem.

ii. Give two examples of density-dependent factors.

iii. Explain briefly how density-dependent factors and density-independent factors affect the dynamic equilibrium in an ecosystem.

 A tall man and a tall woman have a child that is short.

(a) i. State two factors that could be responsible for the height of their child.

ii. With the aid of a genetic diagram, give the genotypes of their offspring if the allele for tallness is T

iii. Give the genotype of the child that is short

(b) i. Define the term genotype.

ii. List two factors that could variation in a character within the same species

(c) i.Define the term allele.

ii. State two differences between genotype and phenotype.

(a)State one function each of the following parts of the nephron:

(i) glomerulus (ii)Bowman's capsule (iii) proximal convoluted tubule (iv) distal convoluted tubule

(b) Complete the table below.

(c) List five excretory products of plants.

An individual ate a hot and large meal of cassava with salty groundnut soup. The individual was sweating profusely and did not drink water after the meal.

(a) State one role each played by the following organs involved in the activity above:

(i) mouth; (ii) skin; (iii) tongue; (iv) kidney; (v) stomach; (vi) small intestine; (vii) large intestine; (viii) liver.

(b) Name three of the organs listed in 2(a) that contain enzymes needed to breakdown the food.

(c) Name three digestive enzymes that would be involved in the digestion of the meal.

(d) Name two end products of the meal after digestion.

(e)(i) State one effect that the excess salt in the meal might have on the individual.

  (ii) State three advantages that the individual would derive from the meal.