IGCSE Biology Paper-4: Specimen Questions with Answers 22 - 24 of 279

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Question 22

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What will be the result when a cross between two heterozygous tall pea plants occur?

Explanation

It shows how a single gene is passed on from parents to next generation. In addition, its ratio will be 3: 1

Image Shows Cross between Two Heterozygous Tall Pea Plants

Question 23

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Figure shows a human kidney. Label the part A B and C also write the functions of nephron.

Image Shows Kidney with Labelling a, B and C

Explanation

Part A- Renal vein

Part B-Ureter

Part C-Medullary pyramid

Functions of nephron- The main functions of the nephron are mainly related to filtering, reabsorbing and secreting glutamate, carbohydrates and solutes from the body.

  • Nephron Eliminate excess water, wastes and other substances from blood.
  • Nephron return compounds for example sodium, potassium or phosphorus whenever any of these substances run low in body.

Question 24

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What is difference between exponential and logistic population growth.

Explanation

Exponential growth: It is continuous population growth in an environment where resources are unlimited. It is density-independent growth. The curve is like J-shaped in such graphs.

Graph Shows Exponential Growth

Logistic growth: It is continuous population growth in an environment where resources are limited. It is density-dependent growth. Sigmoid or S-shaped curve is made in such type of graph.

Graph Shows Logistic Growth

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