The Kenya National Examination Council (Term Paper Sample)

Name………………………………………………………………………. Index Number………/……
121/2 Candidates Signature………
BIOLOGY ALT A Date……………………..
PAPER 1
OCT/NOV 2015
2 Hours
THE KENYA NATIONAL EXAMINATION COUNCIL
Kenya Certificate of Secondary Education
BIOLOGY
PAPER 1
2 Hours
Instructions to candidates
* Write name and index number in the spaces provided above.
* Sign and write the date on the space provided above
* Answer ALL the questions in this question paper in the spaces provided
* Candidates should check the question paper to ascertain all pages are printed as indicated and that no questions are missing.
FOR EXAMINERS USE ONLY





















Grand-
Total
1. State two properties of the cell membrane. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________2. Outline two precautions taken during collection and observation of live specimens. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________3. (a) What is the formula for calculating linear magnification using a light microscope. (1mk)___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(b) State two functions of centrioles. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________4. Describe how diffusion gradient affects the rate of diffusion. (3mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________5. What is a guard cell? (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________6. State the specific sites in which the following reactions occur: (2mks)(i) Light stage.___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.(ii) Dark stage.___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________7. Plants relatively have less waste to excrete than animals. Giving two reasons to explain thisObservation. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________8. (a) Name the gap in the lower jaw of a herbivore that facilitate movement of the tongueduring chewing. (1mk)___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(b) Name two substances absorbed into the blood from the stomach in man. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________9. (a) Give two reasons why lower organisms such as bacteria and simple multicellularOrganisms do not have an elaborate transport system. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(b) Explain how the shape of erythrocytes helps it to function efficiently. (1mk)___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________10. Explain leaf fall as a factor affecting transpiration rate. (3mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________.11. List three structures where gaseous exchange occurs in amphibians. (3mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________12. State two causes of Asthma. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________13. Give two factors affecting the rate of respiration. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________14. (a) Aerenchyma tissues and pneumatophores are found in plants occupying differentHabitats, Identify these habitats. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(b) What is the function of pneumatophores? (1mk)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________15. Name two excretory products produced by both plants and animals. (2mks)____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________16. What is the meaning of the following terms as they apply to cells(i) Eukaryotes. (1mk).___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________(ii) Prokaryotes. (1mk)__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________17. What is the effect of anti-diuretic hormone (ADH) in the human body. (2mks)______________________________________________________________________________________________________________...