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O Level Biology: Development of Organisms and Continuity of Life MCQs — Biology (page 2)

36 multiple-choice questions on O Level Biology: Development of Organisms and Continuity of Life from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. How many chromosomes are in a human sperm cell?

  1. 22
  2. 46
  3. 23
  4. 92

Answer: C) 23

Explanation: Gametes are haploid: 23. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division

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27. Cross-pollination produces

  1. no variation
  2. identical offspring
  3. fewer seeds always
  4. more variation than self-pollination

Answer: D) more variation than self-pollination

Explanation: Two different plants contribute genes. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants

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28. Wind-pollinated flowers have

  1. large coloured petals
  2. feathery stigmas hanging outside the flower
  3. sticky pollen
  4. nectar

Answer: B) feathery stigmas hanging outside the flower

Explanation: Feathery stigmas catch airborne pollen. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants

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29. Which part of the flower produces pollen?

  1. Stigma
  2. Sepal
  3. Anther
  4. Ovary

Answer: C) Anther

Explanation: Anthers make pollen. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants

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30. Compared with an egg, a sperm is

  1. larger and unable to move
  2. the same size
  3. produced in smaller numbers
  4. much smaller and able to swim

Answer: D) much smaller and able to swim

Explanation: Sperm are small, numerous and motile. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans

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31. During germination, amylase

  1. makes starch
  2. produces chlorophyll
  3. breaks down stored starch for the growing embryo
  4. absorbs water

Answer: C) breaks down stored starch for the growing embryo

Explanation: Enzymes digest stored food. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.3 Sexual reproduction in plants

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32. A diploid nucleus contains

  1. four sets of chromosomes
  2. one set of chromosomes
  3. two sets of chromosomes
  4. no chromosomes

Answer: C) two sets of chromosomes

Explanation: Diploid = two sets (pairs). O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.1 Nuclear division

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33. Which substance passes from the fetus to the mother across the placenta?

  1. Carbon dioxide
  2. Oxygen
  3. Glucose
  4. Antibodies

Answer: A) Carbon dioxide

Explanation: Wastes pass to the mother. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.4 Sexual reproduction in humans

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34. A disadvantage of asexual reproduction is

  1. it is slow
  2. it needs two parents
  3. lack of variation means a disease could kill all offspring
  4. it needs pollinators

Answer: C) lack of variation means a disease could kill all offspring

Explanation: Identical offspring share weaknesses. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.2 Asexual and sexual reproduction

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35. In sexual reproduction, a zygote is formed by

  1. binary fission
  2. budding
  3. mitosis
  4. the fusion of two gamete nuclei

Answer: D) the fusion of two gamete nuclei

Explanation: Fertilisation forms a diploid zygote. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.2 Asexual and sexual reproduction

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36. Asexual reproduction produces offspring that are

  1. always haploid
  2. produced from two parents
  3. genetically different
  4. genetically identical to the parent

Answer: D) genetically identical to the parent

Explanation: One parent, no gametes, clones. O Level Biology · Topic 16 Development of Organisms and Continuity of Life · 16.2 Asexual and sexual reproduction

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