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Biology questions, chapter 6
Nama / NameKelas / ClassTarikh / Date

Cell Division

38 marks. Use Practice to check each answer as you go, or Exam to answer everything against the clock first.

Section A: objective questions

10 marks
Choose the best answer for each question.
1

Question 1

Division of the cytoplasm is called
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A
Cytokinesis is cytoplasmic division; karyokinesis is nuclear division.
For the teacher: Remembering, low difficulty, standard 6.1
Textbook p. 100
2

Question 2

Human gametes contain
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C
Gametes are haploid, n = 23.
For the teacher: Remembering, low difficulty, standard 6.1
Textbook p. 100
3

Question 3

In which phase is DNA replicated?
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D
DNA synthesis occurs in the S phase.
For the teacher: Understanding, low difficulty, standard 6.2
Textbook p. 101
4

Question 4

At which stage are chromosomes aligned on the equatorial plane?
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B
Chromosomes line up in a single row in metaphase.
For the teacher: Remembering, low difficulty, standard 6.2
Textbook p. 103
5

Question 5

Which statement describes cytokinesis in a plant cell?
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D
Plant cells form a cell plate; constriction by microfilaments is in animal cells.
For the teacher: Understanding, low difficulty, standard 6.2
Textbook p. 104
6

Question 6

Crossing over occurs during
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A
Crossing over at chiasmata happens in prophase I and produces genetic variation.
For the teacher: Understanding, low difficulty, standard 6.3
Textbook p. 106
7

Question 7

A cell with 2n = 20 undergoes meiosis. Each daughter cell at the end has
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B
Meiosis gives four haploid cells; n = 10.
For the teacher: Applying, medium difficulty, standard 6.3
Textbook p. 107
8

Question 8

Which is true of meiosis but not mitosis?
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C
Crossing over and independent distribution make meiotic cells genetically different.
For the teacher: Analysing, medium difficulty, standard 6.3
Textbook p. 108
9

Question 9

A malignant tumour is also called
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C
A malignant tumour is cancer.
For the teacher: Understanding, low difficulty, standard 6.4
Textbook p. 108
10

Question 10

A normal gamete fuses with a gamete that has 24 chromosomes. The zygote has
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A
23 + 24 = 47: trisomy 21 if the extra chromosome is 21.
For the teacher: Applying, medium difficulty, standard 6.4
Textbook p. 109

Section B: structured questions

28 marks
Answer all questions. Write your answers in the spaces provided.
11

Question 11

Define the following terms.
[1 mark] (a)Homologous chromosomes
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[1 mark] (b)Haploid
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[1 mark] (c)Karyokinesis
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[1 mark] (d)Chromatin
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For the teacher: Remembering, low difficulty, standard 6.1
Textbook p. 100
12

Question 12

A student studies the cell cycle.
[2 marks] (a)State the longest phase of the cell cycle and name its three sub-phases.
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[2 marks] (b)Explain what happens to each chromosome in the S phase.
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[2 marks] (c)Predict what happens if spindle fibres fail to develop during mitosis.
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For the teacher: Understanding, low difficulty, standard 6.2
Textbook p. 101
13

Question 13

Compare cytokinesis in animal and plant cells.
[2 marks] (a)State two differences.
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[1 mark] (b)State the stage of mitosis after which cytokinesis begins.
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For the teacher: Analysing, low difficulty, standard 6.2
Textbook p. 104
14

Question 14

A farmer wants many identical, high quality mango plants in a short time.
[1 mark] (a)Name a technique he can use.
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[2 marks] (b)Explain why the plants produced are identical to the parent.
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[1 mark] (c)State one application of mitosis in the field of medicine.
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For the teacher: Applying, medium difficulty, standard 6.2
Textbook p. 105
15

Question 15

Meiosis produces gametes.
[2 marks] (a)Explain how meiosis I reduces the number of chromosomes in the daughter cells.
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[2 marks] (b)State two reasons why meiosis is necessary.
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Any 2 points
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[1 mark] (c)State one difference between metaphase I of meiosis and metaphase of mitosis.
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For the teacher: Analysing, medium difficulty, standard 6.3
Textbook p. 107
16

Question 16

Abnormal cell division can affect human health.
[1 mark] (a)State the chromosome number of an individual with Down syndrome.
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[3 marks] (b)Explain how this condition arises.
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[2 marks] (c)Explain why radiotherapy is used to treat cancer.
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For the teacher: Evaluating, high difficulty, standard 6.4
Textbook p. 109