Reproduction (SQA National 5 Biology): Exam Questions

The diagram represents some of the events that occur during reproduction and early growth in humans.

Name the site of sperm production in the body.

Describe how the chromosome complement of a sperm cell differs from cell A.

Name process B.

Early embryos contain stem cells.

What feature of stem cells makes them important in early embryo development?

The diagram shows the main parts of a flower.

Which row in the table identifies structure G and the chromosome complement of the cells it produces?

The diagram relates to reproduction in humans.

(i) Name organ G.

[1]

(ii) Describe what happens during fertilisation.

[1]

(iii) Name cell H.

[1]

Name the unspecialised cells that can be obtained from an embryo at a very early stage.

A man is fertile if his semen contains a minimum of 20 million sperm per cm³ and at least 75% of the sperm cells are active.

The table shows the results of semen analysis from four sperm samples.

Identify the sample that was from an infertile man.

The diagram shows a cross between a horse and a donkey and the resulting offspring.

The diploid number of chromosomes for the horse and donkey are given.

The horse and the donkey produce gametes required for reproduction.

(i) Name the type of gamete produced by the female horse in this cross.

[1]

(ii) Name the organ where the gametes of the male donkey are produced.

[1]

Name the cell produced when the nuclei of male and female gametes fuse.

(i) State the diploid number of chromosomes in the offspring in this cross.

[1]

(ii) This offspring is not fertile.

Using this information, give a conclusion about horses and donkeys.

[1]

The diagram shows the process of fertilisation in animals.

Name the organ that produces egg cells.

Underline one option in the brackets to complete the following sentence.

Cell Y contains a {haploid/diploid} number of chromosomes.

In vitro fertilisation (IVF) is a technique that can be used to help people with fertility problems to have a baby.

The table shows the results of IVF treatments for women of different ages.

(i) Calculate how many times greater the chance of a 38 year old woman giving birth to a baby is compared to that of a 44 year old woman.

[1]

...................................times greater

(ii) Calculate the number of births likely to occur if an IVF clinic treated 250 women aged 41.

[1]

.........................births

One of the causes of fertility problems is that some sperm are unable to swim to the egg due to a lack of energy.

Name the organelle that is low in number in these affected sperm.