Which one of the following is not a part of the hindbrain of human beings?
- A.Medulla
- B.Pons
- C.Corpus callosum
- D.Cerebellum
Correct answer
Explanation
The correct answer is C, Corpus callosum. The corpus callosum is a thick band of nerve fibres that joins the two cerebral hemispheres, so it belongs to the forebrain, not the hindbrain. The human brain has three main regions. The forebrain includes the cerebrum, thalamus and hypothalamus; the corpus callosum lies within it and lets the left and right halves of the cerebrum exchange information. The midbrain is a short region that handles some visual and auditory reflexes. The hindbrain is made of the pons, the cerebellum and the medulla oblongata, and it controls balance, posture and the vital involuntary actions of the body. Option A is wrong because the medulla controls breathing, heartbeat, swallowing and vomiting, and it is part of the hindbrain. Option B is wrong because the pons relays signals and helps regulate breathing; it too is in the hindbrain. Option D is wrong because the cerebellum keeps balance and coordinates voluntary movement, and it is the largest part of the hindbrain. Exam tip: hindbrain = pons + cerebellum + medulla; corpus callosum joins the two cerebral hemispheres.
Practice Questions
View allWhich one of the following is not used as fertilizer?
- A.Ammonium nitrate
- B.Ammonium sulphide
- C.Ammonium phosphate
- D.Ammonium sulphate
Show answer
Ammonium sulphide is an unstable, foul-smelling compound that breaks down to release ammonia and toxic hydrogen sulphide, so it is not used as a fertiliser.
Read the full explanation →The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eye-piece is
- A.12.5 cm
- B.5 cm
- C.2 cm
- D.10 cm
Show answer
For an astronomical telescope in normal adjustment the magnifying power equals the focal length of the objective divided by that of the eyepiece, so the eyepiece focal length is 50 ÷ 25 = 2 cm.
Read the full explanation →The major source of vitamins and minerals for vegetarians is
- A.black gram and wheat.
- B.rice and mustard.
- C.vegetables and fruits.
- D.soya bean and milk.
Show answer
Vegetables and fruits supply most of the vitamins and minerals in a vegetarian diet, which is why they are called protective foods.
Read the full explanation →Which one of the following compounds is used in black and white photography?
- A.AgF
- B.AgBr
- C.AgCl
- D.Ag2SO4
Show answer
Silver bromide is the light-sensitive compound coated on black and white photographic film and paper, because light breaks it down into tiny grains of silver metal.
Read the full explanation →Which one of the following statements about speed and velocity is correct?
- A.Speed and velocity both are vector quantities.
- B.Speed and velocity both are scalar quantities.
- C.Speed is vector quantity and velocity is scalar quantity.
- D.Speed is scalar quantity and velocity is vector quantity.
Show answer
Speed tells only how fast a body moves, while velocity also tells the direction of motion, and a quantity with both magnitude and direction is a vector.
Read the full explanation →