Share this:
BIOLOGY PAPER 1 YEAR 2009
- (a) Name the external feature which is common in birds, fish and reptiles
( 1 mk)
(b) State two characteristics of fungi ( 2 mks)
- Name two befits that a parasite derives from the host ( 2 mks)
- State the functions of the following parts of a light microscope ( 2 mks)
- Objective lens
- Diaphragm
- (a) The state during which a seed cannot germinate even when conditions for
Germination are suitable is called ( 1 mk)
(b) The diagram below represents a stage during germination of a seed
(i) Name the type of germination illustrated in the diagram ( 1mk)
(ii) State the role of the part labeled x during germination of the seed ( 2 mks)
- (a) What is meant by the following terms
(i) Hybrid vigour ( 1 mk)
(ii) Polyploidy? ( 1 mk)
(b) State two causes of chromosomal mutations ( 2 mks)
- The diagram below shows a section through a plant organ
(a) (i) Name the class of the plant which the section was obtained ( 1 mk)
(ii) Give a reason for your answer in (a) (i) above
(b) State the functions of the part labeled F ( 1 mk)
- State the function of the following cell organelles
- Ribosome ( 1 mk)
- Lysosomes ( 1 mk)
- (a) Pregnancies continues if the ovary of an expectant mother is removed
after 4 months explain ( 2 mks)
(b) What is the role of the testes in the mammalian reproductive systems?
( 2 mks)
- (a) Name the causative agents of the following diseases in humans ( 2 mks)
- Typhoid
(ii) Amoebic dysentery
(b) Name the disease in humans caused by plasmodium falciparum ( 1 mk)
- (a) (i) What is meant by vestigial structures ? ( 1 mk)
(ii) Give an example of a vestigial structure in human ( 1 mk)
(b) Explain why certain drugs become ineffective in curing a disease after many years of use. ( 2 mks)
-
In an experiment the shoot tip of a young tomato plant was decapitated as shown in the diagram below
(a) State the expected results after 2 weeks ( 1 mk)
(b) Give a reason for your answer in (a) above ( 2 mks)
- The diagram below represents a bone obtained from a mammal
(a) Name the bone ( 1 mk)
(b) Name the:
(i) Bone which articulate with the bone named in (a) above at the cavity labeled K; ( 1 mk)
(ii) Joint formed by the two bones ( 1 mk)
(c) State the function of the part labeled J ( 1 mk)
- (a) Distinguish between diffusion and active transport ( 2 mks)
(b) State one role that is played by osmosis in ( 1 mk)
(i) Plants
(ii) Animals
- Name a support tissue in plants that is not thickened with lignin ( 1 mk)
- Name the type of movement that occurs within a plant cell ( 1 mk)
- (a) Name the gaseous exchange surface in insects ( 1 mk)
(b) How is the surface named in (a) above suited to its function ( 2 mks)
- Explain why plants do not require specialized excretory organs ( 4 mks)
- Explain how the following factors affect the rate of photosynthesis:
(a) Concentration of carbon (iv) oxide ( 1 mk)
(b) Light intensity ( 1mk)
- (a) State three effects of dumping untreated sewage into a river ( 3 mks)
(b) Name one process that is responsible for loss of energy from one trophic level to the next ( 1mk)
- Other than using the quadratic, give two methods of estimating population of grass (2 mks)
- Explain what happens in humans when concentration of glucose in the blood decreases below the normal level ( 4 mks)
- Explain how the carnassials teeth of a dog are adapted to their function ( 2 mks)
- state the function of iron in the human body ( 1 mk)
- Explain how the following factors determine the daily energy requirement in human:
- Age ( 1 mk)
- Occupation ( 1 mk)
- Sex ( 1 mk)
- State two ways in which aerenchyma tissues in aquatic plants are adapted to their function ( 2 mks)
- How are the mitochondria adapted to their functions? ( 2 mks)
- State two ways in which anaerobic respiration is applied in industries
( 2 mks)
( 3 mks)
(b) Name a disease that causes thickening and hardening of arteries
( 1 mk)
- Explain why the rate of transpiration is reduced when humidity is high