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CAIE IGCSE Biology 16 Reproduction Questions

Review asexual and sexual reproduction, flowering plants, human reproduction, sex hormones and sexually transmitted infections.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

16.1 Asexual reproduction16.2 Sexual reproduction16.3 Sexual reproduction in plants16.4 Sexual reproduction in humans16.5 Sex hormones in humans16.6 Sexually transmitted infections

Question 1

[Maximum number: 6]

Fig. 2.1 shows a dwarf sunflower and a tall sunflower, Helianthus annuus. The height of the dwarf sunflower is 0.45 m and the height of the tall sunflower is 4.5 m .

not to scale

not to scale

Dwarf plants like the one in Fig. 2.1 have mutant alleles.

Question (a)

(a)

Fig. 2.3 shows how several strawberry plants can be formed from one parent plant.

Fig. 2.3

Fig. 2.3

[ 6 ]

Question (i)

(i)

Explain the type of reproduction that produces plants by the method shown in Fig. 2.3.

[ 3 ]

Question (ii)

(ii)

Explain the disadvantages of the type of reproduction shown in Fig. 2.3.

[ 3 ]

Question 2

[Maximum number: 5]

Question (a)

(a)

A scientist investigated sexual reproduction in flowering plants.

Fig. 2.1 shows the procedure for crossing two plants of the same species.

Fig. 2.1 shows the procedure for crossing two plants of the same species.

The scientist collected the seeds and germinated them. The leaves and flowers of the offspring plants showed phenotypic variation as they were not all identical to the parent plants.

The scientist then investigated the chromosomes of all the offspring plants and found that they had exactly the same number of chromosomes as the parent plants.

[ 5 ]

Question (i)

(i)

Suggest why the scientist placed a bag around flower 1.

[ 1 ]

Question (ii)

(ii)

Explain how sexual reproduction results in the variation that the scientist discovered in the offspring plants.

[ 2 ]

Question (iii)

(iii)

The chromosome number of the offspring plants is the same as the chromosome number of the parent plants in this investigation.

Explain how the chromosome number is maintained from one generation to the next.

[ 2 ]

Question 3

[Maximum number: 8]

Question (a)

(a)

Fig. 6.1 is a half-flower drawing of pride of Barbados, Caesalpinia pulcherrima.

Fig. 6.1

Fig. 6.1

Complete Table 6.1 by stating the letter from Fig. 6.1 that indicates the organ where each function occurs and the name of the organ.

Table 6.1

Table 6.1

[ 4 ]

Question (b)

(b)

Fig. 6.2 is a scanning electron micrograph of some pollen grains from wind-pollinated flowers and insect-pollinated flowers.

Fig. 6.2

Fig. 6.2

[ 2 ]

Question (i)

(i)

Explain how the pollen grain labelled J is adapted for insect pollination.

[ 2 ]

Question (c)

(c)

Pollen grains grow tubes, which contain haploid male gamete nuclei.

[ 2 ]

Question (i)

(i)

One of these male gamete nuclei fuses with the female gamete.

State the part of the flower that contains the female gamete.

[ 1 ]

Question (ii)

(ii)

Explain why it is important for gametes to be haploid.

[ 1 ]

Question 4

[Maximum number: 8]

Question (a)

(a)

Fig. 6.1 is a diagram of the human male reproductive system.

Fig. 6.1

Fig. 6.1

Table 6.1 contains information about the male reproductive system shown in Fig. 6.1.
Complete Table 6.1.

Table 6.1

Table 6.1

[ 4 ]

Question (b)

(b)

State the name of the hormone that causes voices to deepen at puberty.

[ 1 ]

Question (c)

(c)

Sperm have adaptive features to carry out their function.

Explain three adaptive features of sperm.
1
2
3

[ 3 ]
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