Question 1:

The correct answer is:

A. discontinuous variation

Explanation:

• Discontinuous variation refers to traits that fall into distinct categories (e.g., coat color, blood type) with no intermediate forms.

• In the litter, the kittens have different coat colors (e.g., black, white, orange, etc.), and these are distinct categories.

• Continuous variation involves a range of values (e.g., height, weight), which doesn’t apply here.

• Selective evolution refers to natural or artificial selection over generations.

• Random assortment refers to how chromosomes line up during meiosis, which contributes to genetic variation but is not the name of the variation pattern shown.

So, A is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

The correct answer is:

D. A combination of both genetic differences and eating more food.

Explanation:

• Genetics (inherited from parents) plays a role in determining potential size and growth rate.

• Environment (such as eating more food) can affect whether that potential is reached.

• The question says they grew to be "much bigger" — this is likely due to both genetic factors (some kittens may have inherited genes for larger size) and environmental factors (access to more food or better nutrition).

• Options A and B are incomplete on their own. Option C (moving around more) would not generally cause larger size; it might instead burn more calories.

So D is the best answer.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

The correct answer is B. Natural eye colour and blood group.

Here’s why:

The question asks for variation solely caused by genetic differences (no significant environmental influence).

• Natural eye colour – Determined almost entirely by genetics (genes controlling melanin in the iris). Environmental factors (e.g., sunlight) have negligible effect on natural eye colour.

• Blood group – Determined entirely by which alleles of the ABO (and related) genes you inherit. No environmental influence.

Now check the other options:

• A. Obesity and hair colour – Hair colour is largely genetic (though sunlight can lighten it). Obesity is strongly influenced by both genetics and environment (diet, exercise, lifestyle). Not solely genetic.

• C. Skin colour and I.Q. – Skin colour has a strong genetic basis but is also influenced by sun exposure (environmental). I.Q. is influenced by both genetics and environment (education, nutrition, socioeconomic factors). Not solely genetic.

• D. Obesity and natural eye colour – Natural eye colour is fine, but obesity is not solely genetic (see above).

Therefore, B is the only pair where both traits are caused entirely by genetic differences without significant environmental influence.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

Answer: B. Two

Reasoning: The legend and the diagrams show two distinct types of insects: black dots and red dots.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

Answer: D. 'Red' variety was resistant to the pesticide but the pesticide killed the 'black' variety.

Reasoning: Natural variation within a species can lead to some individuals having a trait (resistance) that allows them to survive a specific threat, like a pesticide, while others do not.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

Answer: A. By a mutation in the insect's genome

Reasoning: Genetic resistance typically arises from random mutations. Those insects with the mutation survive and pass the trait to their offspring, leading to an increased resistant population over time (as seen in diagram 4).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

The correct answer is:

C. By natural selection

Explanation:
Darwin’s theory of evolution states that new species evolve over time through natural selection — where individuals with advantageous traits are more likely to survive, reproduce, and pass on those traits to the next generation.

• A. By adapting to the environment — This sounds similar, but in Darwin’s theory, adaptation is the result of natural selection, not the mechanism itself.

• B. By selective breeding — This is artificial selection, not Darwin’s mechanism for evolution in nature.

• D. By chance — While mutations occur by chance, natural selection (not chance alone) drives evolution of new species.

So, C is correct.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

Let’s analyze each option in the context of Darwin’s theory of evolution through natural selection:

• A. Within a breeding population there is variation — True; genetic variation is essential for natural selection. ✔️ Involved.

• B. Organisms compete for resources such as food, habitat, mate — True; competition for limited resources drives survival of the fittest. ✔️ Involved.

• C. Those varieties of a species that are better suited to the changing environmental pressures survive and mate — True; this is natural selection in action. ✔️ Involved.

• D. As the environment changes an organism adapts to the change — This sounds like Lamarckism (inheritance of acquired characteristics). Organisms do not deliberately adapt to the environment; those with pre-existing beneficial variations are naturally selected. Darwin emphasized variation and selection, not organisms adapting in their lifetime.

So, the statement NOT involved in natural selection is:

D. As the environment changes an organism adapts to the change.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

Let’s put the stages in logical order:

1. Mutations happen first, creating different varieties of bacteria (including some with resistance) — 3.

2. The patient is given antibiotics — resistant ones survive, others die — 4.

3. The resistant bacteria reproduce and pass on the resistant gene — 2.

4. When resistant bacteria infect another person, antibiotics will not kill them — 1.

Correct order: 3, 4, 2, 1 → which matches option C.

Answer: C

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

The correct answer is:

C. Take antibiotics only when really needed and complete the full course.

Explanation:

• Taking antibiotics only when necessary (i.e., for bacterial infections, not viral ones like colds or flu) reduces unnecessary selection pressure for resistant bacteria.

• Completing the full course ensures that all bacteria are killed, reducing the chance that any resistant ones survive and multiply.

The other options would increase resistance:

• A — Overuse of antibiotics promotes resistance.

• B — Stopping early can leave resistant bacteria alive to multiply.

• D — Sharing antibiotics is dangerous and can lead to misuse and resistance.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.