The epidermis of a leaf is considered an example of a tissue because the cells

• A. allow sunlight to pass through.
• B. are covered by a waxy cuticle
• C. all possess a similar structure and function
• D. allow water to enter them by osmosis

In his theory of evolution, Darwin implied that

• A. the struggle for existence among living organisms is sporadic
• B. the most successful organisms are those that best adapt to their environment
• C. organs of the body which are not regularly used by an organism will disappear
• D. any traits acquired by an organism during its lifetime can be passed on its offspring

The following adaptations are associated with the flight of birds except

• A. reduced body weight
• B. streamlined shape
• C. presence of powerful muscles
• D. clawed digits

An animal which is active during the day is known as a

• A. nocturnal animal
• B. diurnal animal
• C. terrestrial animal
• D. homortacmic anima

The ridicule of a bean seedling grows most rapidly in the region

• A) of the root tip
• B) below the top soil
• C) just around the root tip
• D) just below the root tip

the part of the stomach nearer the gullet is called th

• A. epiglottis
• B. cardiac spincter
• C. duodenum
• D. pyloric sphincter

The conversion of ammonium salts into nitrates is called_______

• A. putrefaction
• B. denitrification
• C. fixation
• D. nitrification

A health condition that is known to have resulted from gene mutation is

• A. haemophilia
• B. colour blindness
• C. sickle-cell anaemia
• D. anaemia

Mammals are capable of producing hypertonic urine mainly because of re-absorption in the

• A. Bowmans capsule
• B. Urethra
• C. Ureter
• D. Loop of henle

Which of the following conditions will cause a decrease in body temperature?

• A. increased metabolism
• B. Shivering
• C. Vasoconstriction of capillaries of the skin
• D. Relaxation of the erector muscles