Question 1 of 20 5,032 total questions
The contrasting pair of genes affecting a trait and located at the same position on homologous chromosomes is
A chromatids
B mutants
C alleles
D chromatin
If a heterozygous red flowered plant, (Rr) was self-fertilized, the offspring would be expected to be
A all red flowered plants
B all white flowered plants
C red flowered, white flowered plants
D white flowered red flowered plants
The blood group in humans referred to as a universal recipient is
Which of the following trait in humans is not a morphological variation?
A Height
B Shape of head
C Colour of skin
D Ability to roll the tongue
Variation is a factor which
A differentiates between individuals of the same species
B qualifies an organism to live with others
C enables organisms to adapt to the environment
D states the external features of an organism
The following practices can contribute towards the conservation of natural resources except
A afforestation
B deforestation
C contour ploughing
D establishment of Game Reserves
Which of the following orders correctly represents the trend in eutrophication?
A Lack of oxygen → Death of aquatic organisms → Massive algal growth
B Excess nitrates and phosphates → Massive algal growth → Lack of oxygen → Death of aquatic organisms
C Heavy mineralization → Lack of oxygen → Massive algal growth
D Excess nitrates and phosphates → Lack of oxygen → Massive algal growth → Death of aquatic organisms
An effective management of natural resources to ensure their continued yield from generation to generation may involve all the following except
A protection of wildlife
B prevention of habitat destruction
C biological control of pests
D disposal of raw sewage into the sea
Air pollution can be reduced by the following methods except?
A building tall factory chimneys
B passing waste gases through filters and absorbers
C using lead-free petrol in car
D recycling tins, cans and bottles
Which of these diseases cannot be spread by an insect?
A Cholera
B Malaria
C Trypanosomiasis
D Measles
Which of the following statements about feeding relationships is correct?
A In a food web on land, grasshopper feeds on praying mantis and on predator bugs
B In a food chain on land, green plant is the producer
C In an aquatic food chain mollusc larvae are the producers
D In an aquatic food web, various copepods feed on mollusk Larvae and on sand eel
Organisms that feed essentially on plants within any ecosystem may be referred to as
A carnivores
B herbivores
C saprophytes
D omnivores
Which of these factors are common to both aquatic and terrestrial habitats?
A Light, rainfall and turbidity
B Light, temperature and tide
C Light, rainfall and temperature
D Rainfall, turbidity and salinity
The physical and chemical factors which affect the life of organisms in an environment are described as
A biotic
B edaphic
C abiotic
D physiographic
The group of several populations that interact and share a habitat, form
A a species
B a community
C an ecotype
D a tribe
Which of the following components of an ecosystem does not contribute to the biomass of the system?
A Producers
B Consumers
C Micro-organisms
D Habitat
The first step in carrying out ecological studies in a terrestrial habitat is
A quadrat sampling
B mapping the area
C collection of organisms
D measuring abiotic factors
Siphons and gills are structures in aquatic organisms used for
A gaseous exchange
B buoyancy
C excretion
D movement
Which of the following organisms feeds both autotrophically and heterotrophically?
A Hydra
B Paramecium
C Mucor
D Euglena
The examples of autotrophic organisms include the following except
A Euglena
B Chlamydomonas
C Hydra
D Spirogyra
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