GCSE Combined Science Biology 2

Question 1

In genetics, what does the term 'heterozygous' mean?

Accepted Answer

Having two different alleles for a gene

Answer

Having two identical alleles for a gene

Answer

Having only one allele for a gene

Answer

Having no alleles for a gene

Question 2

Which ecological term describes a community of organisms and their physical environment interacting together?

Accepted Answer

Ecosystem

Answer

Population

Answer

Habitat

Answer

Niche

Question 3

During exercise, which substance builds up in muscles when there is insufficient oxygen for aerobic respiration?

Accepted Answer

Lactic acid

Answer

Carbon dioxide

Answer

Ethanol

Answer

Glucose

Question 4

What is the function of the stomata in a leaf?

Accepted Answer

To allow gas exchange and control water loss

Answer

To absorb water from the soil

Answer

To produce chlorophyll

Answer

To transport sugars around the plant

Question 5

Which type of pathogen causes diseases such as measles and influenza?

Accepted Answer

Viruses

Answer

Bacteria

Answer

Fungi

Answer

Protists

Question 6

What happens to the rate of enzyme activity if the temperature exceeds the enzyme's optimum?

Accepted Answer

It decreases because the enzyme becomes denatured

Answer

It continues to increase

Answer

It stays the same

Answer

It doubles with every 10°C rise