Which of the following will have the least effect on the rate of change of the numbers in a population?
- A. food supply
- B. mutation
- C. predation
- D. disease
Pneumatophores are essential for
- A. nutrition
- B. movement
- C. breathing
- D. growth
Fish cannot survive on land because it has
- A. a body covered with scales
- B. a streamlined body
- C. no lungs
- D. no walking appendages
The gas produced during decomposition of matter is
- A. hydrogen sulphide
- B. carbon monoxide
- C. chlorine
- D. oxygen
Which of the following environmental factors is not considered in a terrestial habitat?
- A. Temperature
- B. Sunlight
- C. Humidity
- D. Turbidity
Which of the following values showing the total biomass of organisms in a food chain represents the secondary consumer?
- A. 40,000
- B. 3,000
- C. 20
- D. 1
Ecology is best defined as the study of
- A. the characteristics of an environment
- B. the inter-relationship between living organisms and their environment
- C. living organisms in a particular area
- D. the habitats and wildlife
The type of nutrition shown by Spirogyra is
- A. symbiosis
- B. holophytic
- C. holozoic
- D. chemosynthetic
Good quality food will perform the following functions in humans except
- A. supplying energy
- B. providing resistance against malaria
- C. sustaining growth
- D. maintaining health
Which of the following essential substances is contained in vegetables?
- A. Chlorophyll
- B. Glucose
- C. Mineral salts
- D. Carbon dioxide
Which of the following organisms exhibits extracellular digestion?
- A. Moulds
- B. Green plants
- C. Algae
- D. Bryophytes
Which of the following is considered to be the first product of photosynthesis?
- A. Protein
- B. Energised chlorophyll
- C. Hydroxyl ions
- D. Starch
Which of the following groups of compounds are products of the light stage of photosynthesis? I. Ribulose bi-phosphate (RuBP) II. Nicotin amide di-phosphorous (NADPH2) III. Oxygen (O 2) IV. Adenosine Triphosphate (ATP)
- A. I,II and lll
- B. l, lll and lV
- C. ll,lll and lV
- D. l, ll, lll and IV
In the test for starch, the leaf is first placed in boiling water to
- A. remove the chlorophyll
- B. dissolved the waxy cuticle
- C. kill and make the leaf permeable
- D. turn it blue-black
Which of the following statements about water in humans is not correct? it
- A. plays an important role in temperature regulation
- B. acts as solvent for substances conveyed around the body
- C. plays a role in the formation of vitamin
- D. is needed for many life processes
The function of the amniotic fluid in humans is to
- A. protect the foetus against shocks
- B. remove waste products from the foetus
- C. supply food and water to foetus
- D. carry oxygen to the foetus
Placentation of plants is best described as the
- A. arrangement of ovules in the ovary
- B. arrangement of fruits on the branches
- C. development of ovules in the ovary
- D. formation of the pericarp from the ovary wall
The layer of light-sensitive cells in the human eye is called the
- A. cornea
- B. sclerotic layer
- C. retina
- D. conjunctiva
Which of the following is the function of the iris of the mammalian eye?
- A. closes and opens the eye
- B. Absorbs dangerous rays from sunlight
- C. regulates the amount of light entering the eye
- D. bringing light rays to focus on the retina
The part of the nervous system that interprets blinking of the eye is the
- A. spinal cord
- B. cerebrum
- C. hind brain
- D. olfactory lobe
The endocrine gland secreting hormone that induces the thyroid gland to produce more thyroxine is
- A. islets of Langerhans
- B. adrenal gland
- C. pituitary gland
- D. parathyroid gland