Question 1 of 20 5,032 total questions
Which of the following statements about mutation is true?
A The genotype is not affected
B The genotype is affected
C The phenotype is not affected
D It cannot be induced by artificial means
Which of the following is not a means of conservation?
A Controlling excessive deforestation
B Prevention of poaching
C Replacing harvested mature trees with seedlings
D Burning of vegetation before cropping
Conservation of wild life is necessary mainly because
A wild species cannot resist disease better than their domesticated species
B many predator wild animals help in control of pests
C many people derive pleasure from observing wild animals
D it helps to prevent extinction of species
Algal bloom depletes oxygen content of bodies of water polluted by
A industrial effluents
B thermal plant discharge
C raw sewage disposal
D crude oil spillage
Which of the following infections is unlikely to respond to antibiotic treatment?
A Typhoid fever
B Ring worm
C Measles
D Tetanus
The density-dependent factors that operate to regulate a population size may include the following except
A shortage of food supply
B fire outbreak
C spread of diseases
D increased competition
Which of the following organisms is well adapted for fluid feeding?
A Cockroach
B Mosquito
C Grasshopper
D Ants
Which of the following processes does not contribute to the maintenance of the nitrogen content of the soil?
A Decomposition
B Denitrification
C Nitrification
D Nitrogen fixation
In an ecosystem the organism which changes light energy into stored chemical energy is the
A consumer
B decomposer
C producer
D carnivore
Which of the following instruments is used to measure the speed of a stream?
A Simple float
B Secchi disc
C Quadrat frame
D Rain gauge
Which of the following factors is not associated with aquatic habitats?
A Salinity
B Turbidity
C Temperature
D Edaphic
A stable self-sustaining environment produced by an interaction between the biotic and abiotic components is best described as
A a niche
B a community
C an ecosystem
D a habitat
Possession of strong adhesives is a feature of animals living in/on
A sandy beaches
B rocky shores
C benthic zones
D deserts
A population is best described as
A a group of the same species of organisms living together
B a group of animals and plants living together
C a group of insects and grasses
D different species of wild animals
In the marine food web, the source of energy to the producer comes from
A sea waves
B sea water
C sun
D air
Trees in savannah habitats usually have heavy thick bark which mainly
A reduces the rate of transpiration
B protect them from the scorching sun
C protect them from heavy winds
D resist bush tires
Which of the following juices contains the enzyme ptyalin?
A Gastric juice
B Pancreatic juice
C Succus
D Saliva
Which of the following elements is required in large amounts by plants
A Molybdenum
B Boron
C Copper
D Phosphorus
Which of the following substances has the highest amount of energy in joules per unit weight?
A Carbohydrates
B Proteins
C Fats
D Vitamins
Which of the following elements is required in large amounts by plants
A Molybdenum
B Boron
C Copper
D Phosphorus
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