Chapter 31 test

Which of the following is not part of Darwin’s theory of natural selection?

• A. Offspring inherits half of its genes from each of its parents.

• B. Variations exist between individuals of the same species.

• C. Organisms produce more offspring than they can survive.

• D. Population size remains relatively constant and cannot get bigger indefinitely.

Which of the following causes the struggle for survival in a population?

• A. accumulation of variations

• B. over-production of offspring

• C. unlimited resources

• D. occurrence of mutation

Which factor(s) is/are essential for evolution to occur within a population?

(1) change in environmental conditions

(2) variation in the population

(3) natural selection

• A. (1) only

• B. (1) and (2) only

• C. (2) and (3) only

• D. (1), (2) and (3)

The modern horse is much larger than its ancestors. Which of the following is the best explanation for this change?

• A. The ancestors of the modern horse had to stretch for young leaves on the trees. Thus, they developed longer legs and necks.

• B. Mutation occurred in the past, leading to the formation of larger horses.

• C. The ancestors of the modern horse had to run very fast to escape from predators. Thus, they developed stronger muscles and longer legs.

• D. Larger horses are more adaptable to the environment than the smaller ones. Thus, they are able to survive and breed.

Which of the following statements about the graph is correct?

• A. DDT is ineffective in killing the mosquitoes.

• B. The population of the mosquitoes decreases throughout the six months.

• C. The population of the mosquitoes decreases during the spraying program.

• D. Only female mosquitoes are killed by DDT.

The difference in the genetic make-up of the mosquitoes is the greatest between points

• A. P and S.

• B. P and U.

• C. Q and S.

• D. R and U.

Refer to the experiment then answer the question:

Which of the following statements about the experiment is correct?

• A. Equal numbers of moths should be released in order to get a conclusive result.

• B. Larger number of moths should be recaptured in order to give a conclusive result.

• C. The moths were released in the industrial area.

• D. The moths were released in the countryside.

Refer to the experiment then answer the question:

Which of the following combinations is correct?

• A

• B

• C

• D

Refer to the diagram shows four populations. Interbreeding takes place in the shaded areas to produce fertile offspring.

How many species are present?

• A. 1

• B. 2

• C. 3

• D. 4

Refer to the diagram shows four populations. Interbreeding takes place in the shaded areas to produce fertile offspring.

How many species would be present if population W had disappeared for over a hundred years?

• A. 1

• B. 2

• C. 3

• D. 4