GCSE (9–1) Biology A (Gateway Science) Questions and Answers

1.  Which process in the carbon cycle takes in carbon dioxide from the air? 

A) Combustion 

B) Decomposition 

C) Photosynthesis 

D) Respiration

 2. The diagram shows a pyramid of biomass. Which trophic level is X? 

A) Primary consumers 

B) Producers 

C) Secondary consumers 

D) Tertiary consumers

3. There are two main types of reproduction, sexual and asexual. Which is an advantage of sexual reproduction? 

A) Creates more variation 

B) Produces larger numbers of offspring 

C) Produces offspring that are all identical so well adapted 

D) Only needs one parent

4. What did Gregor Mendel discover? 

A) A theory for how life on Earth started 

B) How characteristics are inherited in pea plants

C) The shape of the DNA molecule 

D) The theory of natural selection

5. Tears and stomach juices are important in the body’s response to pathogens. 

 Which row of the table correctly describes what substances are found in tears and stomach juices?

6. Which statement describes how vaccines work? 

A) Cause the body to produce antibodies. 

B) Cause the release of antigens. 

C) Contain antiviral drugs. 

D) Make platelets more active.

7. A scientist was studying a population of snails. He caught 60 snails in the first sample. He marked them and released them. He caught 50 snails in the second sample. 20 of the snails were marked. 

Use this equation: 

estimated population =

(number caught in number caught in × first sample second sample)

 number in second sample that are marked

 What is the estimated population? 

A) 150 

B) 2400 

C) 3000 

D) 60000

8. A gardener releases spiders into a greenhouse. They eat the insects which are eating her plants. What is this an example of?

A) Biological control

B) Gene technology

C) Homeostasis

D) Parasitism

9 In selective breeding which organisms breed?

A) Humans choose which organisms breed.

B) Organisms that are best suited to their environment will breed. 

C) Random organisms will breed. 

D) The youngest organisms will breed.

10. A scientist is estimating the number of rabbits in a field. He has eight different estimates, 12, 12, 13, 15, 17, 19, 22 and 26. Which is the median value for his estimates? 

A) 8

 B) 12

C) 16

D) 17

11. Strains of bacteria are now becoming resistant to antibiotics. Which process is causing this resistance? 

A) Genetic modification

B) Natural classification

C) Natural selection

D) Selective breeding

12 Plants can be grown in water. What is the name of this growth method?

 A) Active transport

 B) Germination

C) Hypothermia

D) Hydroponics

13. An organism has the genotype TT. Which term describes this organism?

 A) Heterozygous dominant

 B) Heterozygous recessive

C) Homozygous dominant

D) Homozygous recessive

14. Which process produces gametes?

A) Diffusion

B) Fertilisation

C) Meiosis

D) Mitosis

15. Which is a chemical defence of plants?

A) Antimicrobial substances

B) Cell walls

C) Leaf cuticles

D) Thorns



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