Pearson Edexcel A Level · Biology A (Salters-Nuffield) (9BN0)

Biodiversity, endemism and diversity indices: Practice Questions

3 multiple-choice questions marked as you go, and 3 written questions with worked solutions. All on Biodiversity, endemism and diversity indices.

6 questions9 marksFree, no account

Question 1

1 mark

Which inorganic ion is essential for the synthesis of chlorophyll in plants, and often results in yellowing of leaves (chlorosis) if deficient?

Question 2

1 mark

A population of flowers has two alleles for color: R (red) and r (white). If the frequency of the homozygous recessive genotype (white) is \(0.09\), what is the frequency of the dominant allele (R), assuming Hardy-Weinberg equilibrium?

Question 3

1 mark

Which structural feature of xylem vessels allows them to provide support to the plant stem while remaining flexible enough for growth?

Question 4

2 marks

Define the term endemism in the context of biodiversity.

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Question 5

2 marks

Explain why nitrate ions are essential for healthy plant growth.

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Question 6

2 marks

A population contains 40 individuals. If 12 of these individuals are heterozygotes at a specific gene locus, calculate the heterozygosity index \( (H) \).

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