Which of the following substances cannot control the growth of harmful microoganisms?
Antibiotics
Hypertonic salt solution
disinfectants
isotonic sugar solution
Antiseptics
Correct answer is D
No explanation has been provided for this answer.
The use of predators or parasites to control pests in the farm is known as
predator control
chemical control
biological control
animal control
parasitic control
Correct answer is C
No explanation has been provided for this answer.
A climax community is characterised by
a stable composition of plant and animal species
rapid changes in the composition of species
constant changes in appearance of the habitat
different species occurring at different times
gradual change in animal population
Correct answer is A
No explanation has been provided for this answer.
Which of the following is not an adaptation of plants or animals to a desert environment?
Well developed tap root system
small leaves with thick epidermis
Stems with spike-like leaves
Metabolic waste in the form of uric acid in some animals
Broad leaves for storage
Correct answer is E
No explanation has been provided for this answer.
In which of the following processes is carbondioxide not given out?
respiration in plants
decay of organisms
burning organic matter
burning fuels
during photosynthesis
Correct answer is E
No explanation has been provided for this answer.