The activity of ptyalin is likely to decrease with an increase in the concentration of
- A. oxygen
- B. starch
- C. protein
- D. acid
The function of the red head in male Agama lizards is to
- A. scare other males from the territory
- B. warn predators of the distastefulness of the animal
- C. attract female lizards for mating purposes
- D. conceal and camouflage the animal from predators
The ability of chameleon to change its colour rapidly is an adaptation for
- A. obtaining food
- B. attraction mate
- C. communication
- D. escaping detection
Which of the following can cause shrinkage of living cells?
- A. Deionized water
- B. Hypotonic solution
- C. Isotonic solution
- D. Hypertonic solution
The movement response of a cockroach away from a light source is
- A. negative phototaxism
- B. positive phototaxism
- C. negative phototropism
- D. postive phototropism
The theory of natural selection was postulated by
- A. Gregor Mendel
- B. Matthias Schleiden
- C. Charles Darwin
- D. Robert Hook
The theory of use and disuse of organs was promulgated by
- A. Alfred Wallace
- B. Charles Darwin
- C. Jean Lamarck
- D. Robert Hook
A collection of population of all living organisms that exist in a habitat is referred to as
- A. niche
- B. ecosystem
- C. community
- D. environment
The micro-organisms that causes Typhoid disease is
- A. trypanosome gambiense
- B. Salmonella typhi
- C. entamoeba histolytica
- D. plasmodium sp
The type of asexual reproduction that is common to both Paramecium and Protists is
- A. fragmentation
- B. budding
- C. sporulation
- D. fission
The importance of the mouth-brooding behaviour in Tilapia is that it
- A. helps in keeping the young fish warm
- B. affords protection from predation for the young fish
- C. helps the fish to live in a social group
- D. provides regurgitated nourishment to the young fish
Which of the following is NOT a method of conserving wild life?
- A. Indiscriminate poaching
- B. Establishment of zoological gardens
- C. Enacting wildlife conservation laws
- D. Establishment of game reserves
Which of the following pairs are social insects?
- A. Termite and locust
- B. Ants and cockroach
- C. Cockroach and bee
- D. Termite and bee
The vector for the malaria parasite is a
- A. female edes mosquito
- B. female Anopheles mosquito
- C. female culex mosquito
- D. female culex mosquito
The pathogen that cause smallpox is
- A. picornavirus
- B. peramyxovirus
- C. herpesvirus
- D. poxvirus
Fibrinogen and prothrombin play important roles in the
- A. deamination of proteins
- B. clotting of blood
- C. detoxication of substances
- D. storage of vitamins
The largest amount of yolk is found in the egg of
- A. amphibians
- B. pisces
- C. repitles
- D. aves
If the cross of a red-flowered plant with a white flowered plant produces a pink flowered plant, this is an example of
- A. codominance
- B. incomplete dominance
- C. mutation
- D. linkage
The movement of blood between the heart and all other parts of the body besides the lung is known as
- A. systemic circulation
- B. closed circulatory system
- C. pulmonary circulation
- D. single circulation system
Which of the following animals has homodont dentition?
- A. Rat
- B. Man
- C. Lizard
- D. Pigeon
which of the following is an agent of a sexually transmitted disease?
- A. Entamoeba histolytica
- B. Salmonella typhi
- C. Treponema pallidum
- D. Clostridium tetani