Biology_2016_STPM term 3_Objectives

Which inference are correct about the phylogenetic tree above?

I. The wolf and leopard are in different classes.

II. The badger and otter belong to the same order.

III. The leopard and otter do not share a common ancestor.

IV. The coyote and wolf share the first part of the scientific name.

• I and II

• I and III

• II and IV

• III and IV

An ecosystem can be described as

• all the living organisms that inhabit a particular area

• a group of individuals of the same species living in a particular geographical area.

• the entire community of species interacting with the abiotic factors in a certain area.

• all the areas on earth that are inhabited by living organisms, including the atmosphere land and oceans.

What is the correct order of X and Y?

• X : Lepidoptera

  Y : Diptera

• X : Diptera

  Y : Lepidoptera

• X : Odonata

  Y : Diptera

• X : Lepidoptera

  Y : Odonata

Which are true of the biogeochemical cycle above?

I. X may exist as sulphate.

II. Process Q occurs on ocean floors.

III. Process R may occur due to geological uplifting.

IV. Process P is aided by lightning and bacterial activities.

• I and III

• I and IV

• II and III

• II and IV

The carrying capacity of a population is determined by its

• natality

• mortality

• population growth

• limiting resources

In which situation would evolution be the slowest for an interbreeding population?

• Migration :

  High

  Selection pressure:

  Low

  Variation due to mutation:

  High

• Migration :

  High

  Selection pressure:

  High

  Variation due to mutation:

  Low

• Migration :

  Absent

  Selection pressure:

  High

  Variation due to mutation:

  High

• Migration :

  Absent

  Selection pressure:

  Low

  Variation due to mutation:

  Low

Which is not an example of adaptive radiation?

• Pentadactyl limbs in mammals

• Marsupial mammals in Australia

• Melanie peppered moths in industrialised area

• Beaks of Darwin's finches in Galapagos Island

The codons used in translation process are given below.

I. UAG

II. UGA

III. UUA

IV. AUG

Which codons are used as stop codons?

• I and II

• I and IV

• II and III

• II and IV

A monohybrid cross produces F₂ in a ratio of 2 : 1. This is due to

• lethal gene

• epitasis

• codominance

• incomplete dominance

What is meant by gene pool ?

• The sum total of all the alleles present in a population.

• The total number of alleles that will not change over time.

• The relative proportion of the alleles of a gene present in a population.

• The relative proportion of the various genotypes present in a population.