form 3 science Chapter 1

Study the information below.

J- brain K-spinal nerves

L-spinal cord M-cranial nerves

Which of the following represent central nervous system?

• J and K

• J and L

• K and M

• J and K

The diagram 1 shows the path of an impulse after a stimulus is received by the skin.

Which of the following represents X, Y and Z?

• X -Brain, Y - Effector, Z - Receptor

• X - Receptor, Y - Effector, Z - Brain

• X - Brain, Y - Receptor, Z - Effector

• X - Receptor, Y - Brain , Z -Effector

Which of the following is a voluntary action?

• Peristalsis

• Talking

• Sweating

• Heart beat

Diagram 2 below shows a cross-section of human skin.

Which pair of stimuli do receptors P and Q respond to?

• P - Pain, Q -Pressure

• P -Touch, Q - Cold

• P - Cold Q - Pain

• P - Pressure, Q - Touch

The diagram 3 shows the impulse pathway of an action.

Receptor -->Spinal cord --> Effector

Which of the following actions will pass through the same impulse pathway?

• Breathing

• Thinking

• Knee-jerk reaction

• Walking

Which pair of the sensory organ with stimulus below, is not true?

• Eyes - Light

• Nose - Air

• Tongue -Chemical substances

• Ear - Sound

Other than receiving stimulus, the function of skin is

• Help to get rid of secreted subtances

• Control the body temperature

• Preventing the microorganism from entering body

The sensitivity of skin to the stimulus is effected by

• Thickness of fat layer

• Thickness of dermis

• Type of stimulus

• Number of receptors

Which of the following is not correct about nose?

• Sensory cells are located under the nose

• The nose is a sensory organs for a sense of smell

• The amount of fluid increases when a person suffers from flu

• Sensitive cells in the nose are very sensitive to chemicals

Diagram 4 shows a section through part of the human head containing a sensory organ.

Which of the parts labelled A, B, C and D, is a sensory cell?

• A

• B

• C

• D