Biology_2020_STPM term 3 Trial_Terengganu__Objectives

In the preparation of a key to separate four orders, Q, R and T of class Insecta, the observations were made.

Which of the following combinations would give sufficient information for the Four orders to be separated?

• Ⅲ, Ⅱ, Ⅳ

• Ⅱ, Ⅰ, Ⅳ

• Ⅲ, Ⅱ, Ⅴ

• Ⅱ, Ⅳ, Ⅴ

In Malaysia, poaching of tigers has reduced their population significantly. This causes negative impacts on the interactions between populations of different species such as mousedeer and wild boar.

Based on the statements above, which level of biodiversity is affected?

• Species diversity

• Genetic diversity

• Population diversity

• Ecosystem diversity

The rate of absorption of light energy measured in an ecosystem is 12 000 kJ

m^-2y^-1. Only 1% of this energy is converted into net plant production. 10% of the net production is transferred from one trophic level to the next.

What is the amount of energy obtained by secondary consumers?

• 120 kJ m^-2y^-1

• 12.0 kJ m^-2y^-1

• 1.20 kJ m^-2y^-1

• 0.120 kJ m^-2y^-1

A researcher collected 150 specimens of a species of moth, marked them and released them in a 5000m² area. Two days later, he collected 420 specimens of the species of moth, of which 14 were marked.

Assuming that there was no mortality between the time of marking and recapturing, what is the population of the moth species per 100m^2?

• 42

• 90

• 210

• 450

A study shows that the average mortality rate among infants who are less heavy and vey heavy is high. Which is true of the above type of selection?

• Disruptive

• Stabilising

• Directional

• Elimination

X is a species of fish in a river. After a dam is constructed, individuals of species X upstream are separated from the individuals downstream. Gradually, the individuals in the upstream become a new species. What this type of speciation?

• Intraspecific and allopatric.

• Intraspecific and sympatric.

• Interspecific and allopatric.

• Interspecific and sympatric.

Which factors are involves as prezygotic reproductive barriers?

Ⅰ. Gametic isolation

Ⅱ. Hybrid breakdown

Ⅲ. Temporal isolation

Ⅳ. Reduced hybrid viability

• Ⅰ and Ⅲ

• Ⅰ and Ⅳ

• Ⅱ and Ⅲ

• Ⅱ and Ⅳ

After a test-cross is performed, two genes were mapped to be 17.2cM apart. The result suggested that

Ⅰ. 82.8% of the offspring are showing the parental phenotypes

Ⅱ. A single crossing-over has occurred between the two genes

Ⅲ. 172 of the offspring are showing the recombinant phenotypes

Ⅳ. The COV can be calculated by dividing total number of recombinant phenotypes with total number of parental phenotypes

• Ⅰ and Ⅱ

• Ⅰ and Ⅳ

• Ⅱ and Ⅲ

• Ⅲ and Ⅳ

In sheep, the normal fur is controlled by dominant allele R, while the non-uniform fur is controlled by recessive allele r. In a population of 1000 sheep that mate randomly, it is found that 250 sheep have non-uniform fur.

What is the frequency of the recessive allele in the population?

• 0.25

• 0.50

• 0.75

• 0.87

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