To avoid over fishing in a lake, the following measures may be helpful except

• A. limiting fishing periods
• B. regulating the size of nets
• C. fishing throughout the year
• D. fish breeding exercise

In which part of the human body does the secretion of the growth hormone occur?

• A. Head region
• B. Waist region
• C. Neck region
• D. Gonads

Darwin is considered the first scientist who correctly explained the theory of

• A. special creation
• B. spontaneous generation
• C. use and disuse
• D. organic evolution

The respiratory organ of a cockroach

• A. air sac
• B. trachea
• C. lung book
• D. lung

a) Make a labelled diagram to show the internal structure of the mammalian ear.

(b) Describe the mechanism of hearing in mammals.

(c) State two ways of caring for the ear

The type of asexual reproduction that is common to both Paramecium and Protists is

• A. fragmentation
• B. budding
• C. sporulation
• D. fission

Which of the following characters is NOT sex-linked?

• A. River blindness
• B. Baldness
• C. Haemophilia
• D. Colour blindness

If a child can receive blood from all donors, he belongs to the blood group?

• A. O
• B. AB
• C. A
• D. B

The respiratory organ found in the cockroach is the

• A. air sac
• B. trachea
• C. lung book
• D. lung

The blood vessel which carries blood from the alimentary canal to the liver is the?

• A. hepatic artery
• B. hepatic vein
• C. hepatic portal vein
• D. mesenteric artery