Identify the types and functions of teeth (A, B, C), describe differences between tooth A and B, and list two dental care practices. Also, name parts (I, II, III, IV) of a distillation setup and state

Here are the solutions to the questions from the image.

Question 1 (Teeth)

• a) Name each type of teeth labelled A, B and C.

  • A: Molar
  • B: Canine
  • C: Incisor

• b) State one function of each type of tooth labelled A, B and C.

  • A (Molar): Grinding and crushing food.
  • B (Canine): Tearing food.
  • C (Incisor): Biting and cutting food.

• c) State two observable differences between the tooth labelled A and that labelled B.

  1. Tooth A (Molar) has a broad, flat chewing surface with multiple cusps, while Tooth B (Canine) has a single pointed cusp.
  2. Tooth A (Molar) typically has multiple roots, while Tooth B (Canine) has a single root.

• d) Mention two ways of ensuring proper dental care.

  1. Brushing teeth at least twice a day with fluoride toothpaste.
  2. Flossing daily to remove food particles and plaque from between teeth.

Question 1 (Separation Diagram)

• a) Name each of the parts labelled I, II, III and IV.

  • I: Retort stand
  • II: Thermometer
  • III: Condenser
  • IV: Beaker (or Receiving flask)

• b) Name the method of separation used.

  • Distillation (specifically, Simple Distillation)

Question 2

• a) What is technology?

  • Technology is the application of scientific knowledge for practical purposes, especially in industry, to create tools, systems, and methods that solve problems or improve human life.

• b) State two differences between science and technology.

  1. Science focuses on understanding the natural world through observation and experimentation, aiming for discovery and knowledge.
  2. Technology focuses on applying scientific knowledge to create practical solutions, tools, and processes, aiming for invention and application.

• c) Draw a potassium atom and show the distribution of electrons in shells (K=2, L=8, M=8, N=1).

  • (As an AI, I cannot draw, but I can describe it.)
  • Draw a central nucleus.
  • Draw the first electron shell (K shell) with 2 electrons.
  • Draw the second electron shell (L shell) with 8 electrons.
  • Draw the third electron shell (M shell) with 8 electrons.
  • Draw the fourth electron shell (N shell) with 1 electron.

• d) What energy transformation takes place in each of the following activities?

  • i) Using a flashlight battery to produce light in a bulb.
    • Chemical energy (in battery) $\rightarrow$ Electrical energy $\rightarrow$ Light energy + Heat energy.
  • ii) Using a microphone to address a gathering.
    • Sound energy (from voice) $\rightarrow$ Electrical energy (in microphone) $\rightarrow$ Sound energy (from speaker).

• e) List three components of soil.

  1. Mineral particles (e.g., sand, silt, clay)
  2. Organic matter (humus)
  3. Water

Question 3

• a) Mention the functions of a fraction.

  • (Assuming "fraction" is a typo for "friction")
  1. Friction opposes motion, allowing objects to slow down or stop.
  2. It enables walking and gripping surfaces.
  3. It generates heat.

• b) Draw the circuit symbol for a p-n junction.

  • (As an AI, I cannot draw, but I can describe it.)
  • Draw a triangle pointing to the right, with a vertical line at its apex. This symbol represents a diode. The left side of the triangle is the anode (p-type), and the vertical line is the cathode (n-type).

• c) State one function of each of the following parts of the human circulatory system:

  • i) Blood: Transports oxygen, nutrients, hormones, and waste products throughout the body.
  • ii) Blood vessel: Carries blood to and from the heart and all parts of the body.
  • iii) Heart: Pumps blood, maintaining blood flow through the circulatory system.

• d) Classify each of the following substances as element, compound or mixture:

  • **i) Air