Grade 8 Notes CBC Junior Secondary 2024
QUESTIONS
1. State three components of Integrated Science. (3 mks)
a. Physics, chemistry and biology
2. Outline three examples of micronutrients
Vitamins, minerals and macronutrients
3. give two examples of macro nutrients
Carbohydrates proteins and Fats of lipids
4. What is the role of good governance for sustainable health promotion? (3 mks)
- Establishing health centres and facilities.
- Educating people about maintain proper health.
- Frequent vaccinations and screening etc
- proper advertisements
5. Write three examples of vitamins
a. Vitamin A.B1 (Thiamin). b. Vitamin B2 (Riboflavin) c. Vitamin B3 (Niacin)
d. Vitamin C (Ascorbic Acid), e. Vitamin D,E,K
6. What is constipation?
Inability of the digestive system to properly pass out stool
7. state two challenges facing health promotion in the community
low literacy levels, ignorance and lack of proper education, poverty, inadequate resources, harmful cultural practices, stereotypes, Myths and misconceptions
8. What are the names of the following lab apparatus for heating
9. Outline two examples of derived quantities
Volume, Density, Area
8. What is a microscope.
An instrument used to magnify objects and make them appear bigger.
9. Name the types of microscopesa.
The light microscope and Electron Microscope
10. State the purpose of using a light microscope
It magnifies and reveals the structure details of tiny objects such as cell, be seen by the human eye directly
11. Identify the following parts of digestive system
12. Match the skull to the animal it belongs to
13. What is the Apparatus and Instruments for Measuring Volume. (2 mks)
Identify the following Methods of separating mixture
a. Decanting
b. Filtration
c. distillation
14. Name the process that occurs in human esophagus as demostrated
Peristalsis
15. Name three Acid base Indicators
Phenolphthalein, Methyl Orange, Litmus Paper
16. Name two uses of Acid
Vinegar can be used for various household uses such s preservative
sulphuric acid is widely used in batteries that are used to start the engines of auto mobiles
Citric juice is important part of lemon juice and orange juice. it can also be used for preservative
Phosphoric acid is a key ingredient in many soft drinks
Industrial production of dyes, paints and fertilizers involve the use of Sulphuric acids and nitric acid
17. What is magniofication
The power of making an image larger
18. what is the formula of calculating magnification in a light microscope
eyepiece lens magnification X object lens magnification
19. Give the reasons for each of the following steps when preparing a cross section leaf for examination under the microscope
a. cutting very thin sections
allow light to pass through making it easy to observe the tissue
b. using a sharp razor blade during the cutting
sharp blade does not damage ,deform, destroy or distort the surface of cell or tissues
c. placing Sections in water
to maintain turgidity hence maintain shape of cell it prevents drying of section
d. Staining the sections with Iodine before observing
to make chloroplasts, starch containing structures, granules or plastic distinct
