Sexual Reproduction in Humans (Cambridge O Level Biology)

Table 1 shows four structures associated with the human male reproductive system.

Complete Table 1 by identifying the level of organisation of each structure.

Choose your answers from the list.

Table 1

Fig. 1

Table 2 shows information about the male reproductive system shown in Fig. 1.

Complete Table 2.

Table 2

Draw an X on Fig. 1 on the structure where meiosis occurs.

Sperm and eggs each have a nucleus which is haploid.

Define the term haploid nucleus.

[1]

State the number of chromosomes in a human haploid nucleus.

[1]

Fig. 1 shows a fetus developing inside the uterus.

Fig. 1

The fetus developed from a fertilised egg cell

Put an X on Fig. 1 to show where an egg cell is normally fertilised.

Fig. 1 shows a diagram of part of the male reproductive system.

Fig. 1

State the letter on Fig. 1 that identifies:

[1]

Sperm must pass through different structures in the female reproductive system to reach an egg cell.

State the names of three of these structures.

State three ways that sperm are adapted for their function.

Sperm contain chromosomes. Chromosomes contain genes.

State all the possible sex chromosomes that normal sperm can contain.

[1]

Complete the definition of the term gene.

Use words from the list.

Each word can only be used once or not at all.

[2]

Fig. 1 shows a diagram of the human female reproductive system. 

Fig. 1

Using letters A–F, identify the parts of the human female reproductive system in Fig. 1.

Where eggs are made.

[1]

Where fertilisation occurs.

[1]

Where implantation of the zygote occurs.

[1]

Oestrogen is a hormone responsible for the development of secondary sexual characteristics during puberty.

[1]

Describe how the hormone oestrogen is transferred to its target organs.

[1]

Table 1 shows some secondary sexual characteristics.

Place ticks (✓) in Table 1 to show which characteristics develop during puberty in boys and girls.

One row has been done for you. 

Table 1

Fig. 1

Use the letters on Fig. 1 to identify:

• The cervix
• The oviduct
• The uterus
• The vagina

On Fig. 1, write an X to show where female gametes are produced.

State the name of the structure where fertilisation normally takes place.