Reproduction Worksheet - KS3 - Intermediate

Reproduction worksheet for KS3 (Key Stage 3 / Year 7-9 (Ages 11-14)). Intermediate level science practice, aligned to the UK National Curriculum. Print-ready with answer key included.

Science•Key Stage 3 / Year 7-9 (Ages 11-14)•Reproductionintermediate

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Reproduction: From Pollination to Puberty

Key Stage 3 Science | Ages 11–14 | Intermediate

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Instructions: Explore how reproduction happens in flowering plants and humans. Read each question carefully, use the information provided, and write your answers in the boxes. Some questions ask you to explain a process, so include the key steps and scientific terms.

Human reproductive systems: structure and function

Use your knowledge of the human reproductive systems to complete each statement. Choose a suitable scientific term for each blank.

1. In the male reproductive system, sperm are produced in the __________.

2. The tube that carries sperm from the testes towards the urethra is the __________.

3. In the female reproductive system, an egg is released from an __________ during ovulation.

4. Fertilisation usually happens in an __________, where a sperm cell may join with an egg cell.

Puberty and the menstrual cycle

Answer using clear, respectful scientific language. For explanation questions, describe what happens and use the relevant biological terms.

1. What is puberty? Give one example of a physical change that can happen during puberty. [2 marks]

2. Which hormone is mainly responsible for the development of many male secondary sexual characteristics during puberty?

3. What happens to the lining of the uterus if an egg is not fertilised during the menstrual cycle?

4. Explain why hormones are important in coordinating changes during puberty. [2 marks]

From fertilisation to birth

Put the stages in a sensible biological sequence by writing the correct letters in order. Then answer the final question in a full sentence.

Stages:

A. The embryo implants in the lining of the uterus.

B. A sperm cell fertilises an egg cell.

C. The fertilised egg divides repeatedly as it moves towards the uterus.

D. The embryo develops into a foetus.

1. Write the stages in the correct order using their letters.

2. Name the organ in which the embryo and foetus develop.

3. Name the organ that allows oxygen and nutrients to pass from the pregnant person to the developing foetus.

Flower structure and pollination

Use the flower information below to answer the questions. Pollination is the transfer of pollen; do not confuse it with fertilisation, which happens later.

Flower parts: anther — produces pollen; stigma — receives pollen; ovary — contains ovules; petal — can attract pollinators.

1. Which flower part produces pollen?

2. Which flower part receives pollen during pollination?

3. Define pollination.

4. Name one way pollen can be transferred from anther to stigma.

Pollination data: compare two flowers

Study the results in the table. Each flower received the same number of visits, so compare the pollen grains transferred per visit. Show your calculation where needed.

Flower type	Pollinator visits	Pollen grains transferred
Flower A	20	240
Flower B	20	160

1. How many pollen grains were transferred per visit for Flower A?

2. How many pollen grains were transferred per visit for Flower B?

3. Which flower transferred more pollen grains per visit, and by how many?

Plant reproduction: fertilisation and seeds

Complete each response with the correct biological term or a short explanation. Think carefully about what happens after pollen reaches the stigma.

1. After pollination, the pollen grain can grow a __________ down the style towards an ovule.

2. In a flowering plant, fertilisation happens when the male sex cell from pollen joins with the female sex cell in an __________.

3. After fertilisation, what does an ovule usually develop into?

4. Explain one way seed dispersal can reduce competition between a parent plant and its offspring. [2 marks]

Answer Key

Activity 1: testes ; sperm duct (vas deferens) ; ovary ; oviduct (fallopian tube)

Activity 2: 1. Puberty is the period when a child's body develops towards sexual maturity; accept an appropriate physical change, such as growth of body hair or a growth spurt. ; 2. Testosterone ; 3. The uterine lining breaks down and leaves the body as menstrual blood. ; 4. Hormones act as chemical messengers that coordinate body changes; accept a relevant example.

Activity 3: 1. B, C, A, D ; 2. Uterus ; 3. Placenta

Activity 4: 1. Anther ; 2. Stigma ; 3. The transfer of pollen from an anther to a stigma ; 4. By an insect, another animal, or wind

Activity 5: 1. 240 ÷ 20 = 12 pollen grains per visit ; 2. 160 ÷ 20 = 8 pollen grains per visit ; 3. Flower A, by 4 pollen grains per visit

Activity 6: 1. Pollen tube ; 2. Ovule ; 3. A seed ; 4. Dispersal moves seeds away from the parent plant, reducing competition for light, water, space, and minerals.