Free MCQs & Online Quiz Practice for Exams

Q: The rate at which the new individuals are added to a population in a unit time is

A) Density

B) Natality

C) Mortality

D) Dispersion

Q: The term which defines the study of the characteristics and parameters of the population is

A) Demography

B) Population ecology

C) Population density

D) Mortality

Q: Carrying capacity is

A) The maximum number of individuals that can fit into an area

B) The ability of an environment to accommodate a growing population

C) The greatest number of individuals that an area can sustain over the long term

D) The maximum number of species that can co-exist in an area

Q: Which of the following is not a greenhouse gas?

A) Ozone

B) Hydrogen

C) Nitrous oxide

D) Methane

Q: A change in the community structure of an ecosystem over a period of time is

A) Ecological niche

B) Ecological mutation

C) Succession

D) Genetic drift

Q: In succession lithoseres takes place on

A) Sand

B) Water

C) Forest floor

D) Bare rocks

Q: What would be expected to happen if all the nitrogen-fixing organisms ceased to exist?

A) There would be no significant change in numbers of animals

B) The total biomass would be reduced

C) All organisms would die out

D) The nitrogen level of the atmosphere would increase

Q: Which of the following is NOT recycled in ecosystems?

A) Carbon

B) Sulphur

C) Energy

D) Water

Q: The best way to increase food production from ecosystem viewpoint is

A) To increase cultivable land by clearing forest

B) Use of excessive fertilizers

C) Use of high quality pesticides

D) Use of genetically improved varieties of seeds

Q: The total energy from the sun trapped by the producers in an ecosystem is about

A) 20%

B) 10%

C) 5%

D) 1%

Q: The study of human populations and things that affect them is called

A) Angiography

B) Demography

C) Mammography

D) Homography

Q: Bacteria protect themselves from viruses by fragmenting viral DNA with

A) Ligase

B) Endonuclease

C) Exonuclease

D) Gyrase

Q: Transfer of DNA fragments from electrophoretic gel to a nitrocellulose sheet is done for

A) Autoradiography

B) Primer annealing

C) Denaturation

D) Generating markers

Q: The DNA fragments have sticky ends due to

A) Endonuclease

B) Unpaired bases

C) Calcium ions

D) Free methylation

Q: Plasmids are used as cloning vectors for which of the following reasons?

A) Can be multiplied in culture

B) Self-replication in bacterial cells

C) Can be multiplied in laboratories with the help of enzymes

D) Replicate freely outside bacterial cells

Q: Who invented the PCR technique?

A) Kary Mullis

B) Sanger

C) Boyer

D) Collins

Q: In gel electrophoresis of DNA the different bands in the final gel form because the DNA molecules

A) Are from different organisms

B) Have different lengths

C) Have different nucleotide compositions

D) Have different genes

Q: In the reproductive cloning of an animal the genome of the cloned individual comes from

A) A sperm cell

B) An egg cell

C) Any gamete

D) A body cell

Q: What carries a gene from one organism into a bacterial cell?

A) Plasmid

B) An electrophoresis gel

C) Restriction enzyme

D) Polymerase chain reaction

Q: The type of gel most commonly used for short fragment RNA electrophoresis is

A) Agarose

B) DNA Polymeraise

C) Polyacrylamide

D) DNA ligase