Biology Test for Junior Secondary

Extract

[...] Name the dental disease characterized by (2mks) Gums becoming flabby and bleeding Name the substance responsible for hardening of teeth (1mk) 8. State the functions of the following structures of a tooth (2mks) b. Why is it advisable to brush your teeth before going to sleep (1mk) 9. The equations below show a metabolic reaction that occurs in plants CO2 + H2O ? C6H12O6 + O2 i. Identify the above process (1mk) What are the sources of the following in the products (2mks) b. Light is one of the conditions necessary for the above reaction to take place. [...]

[...] Lions feed on gazelles. When lions and gazelles die, they are decomposed by bacteria. From the above information Identify the modes of feeding of 19. Define the term digestion (1mk) What is the importance of (2mks) Differentiate between ingestion and egestion (2mks) 20. A student ate a meal of rice and beef stew. Identify three things that happened to the food in the mouth (3mks) State two roles of saliva to the food in the mouth (2mks) Why did the chemical digestions of the rice stop in the stomach (1mk) State two roles of hydrochloric acid to the digestions of meat in the above meal (2mks) Write down two ways by which the stomach prevents auto digestions (2mks) Bile Juice is very important in the digestions of lipids in the above meal. [...]

[...] Comes immediately after order iii. Forms the first name in binomial nomenclature 11. When estimating the size of an onion epidermal cell, a transparent ruler was placed across the field of view of a light microscope, and this was observed Three cells were counted along the radius of the field of view. Use this information to answer the questions below a. What is the field of view as used in microscopy (1mk) b. Calculate the average size of the epidermal onion cell (2mks) c. [...]

[...] Biology Test for Junior Secondary 1. State the form in which carbohydrates is transported in (4mks) Stored in 2. A solution of sugar cane juice was boiled with dilute hydrochloric acid, sodium hydrogen carbonate was added to it and then boiled until benedicts solution. An orange precipitation was added. a. Why was the solution boiled with hydrochloric acid (1mk) Why was sodium hydrogen carbonate solution added (1mk) To which class of carbohydrates does sugar cane juice belong (1mk) b. Name the teeth that are used to chew sugar cane for maximum extraction (1mk) 3. [...]

[...] How diffusion assists in insect pollination (1mk) ii. Why students were able to detect the smell of a decomposing carcass more at mid-day than in morning (2mks) 14. Write down two differences between active transport and diffusion (2mks) Why is it dangerous to give a dehydrated person water intravenously as drip (2mks) 15. The graph below shows the effect of substrate concentration on the rate of enzyme action Account for the shape of the graph between A - B (2mks) B - C (2mks) How can the rate of reaction be increased after point B (1mk) 16. [...]