Reproduction

Worked examples (6)

• 1Name the conditions needed for germination (Getting started)
• 2Which factor is not needed? (Getting started)
• 3Why boil the water and add oil? (Building confidence)
• 4Identify the variables (Building confidence)
• 5Draw a conclusion using the control (Stretch)
• 6Improve the reliability of the investigation (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Number of parents in each type (Getting started)
• 2Identify the offspring as clones (Getting started)
• 3Features of sexual reproduction (Building confidence)
• 4Features of asexual reproduction (Building confidence)
• 5Advantage of each type, with reasons (Stretch)
• 6Complete a comparison table (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Define gamete and state its chromosome number (Getting started)
• 2Define fertilisation (Getting started)
• 3What happens to the zygote after fertilisation (Building confidence)
• 4Track the chromosome number through fertilisation (Building confidence)
• 5Explain why gametes are haploid (Stretch)
• 6Put the stages of sexual reproduction in order (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the parts of a flower (Getting started)
• 2Define pollination (Getting started)
• 3Adaptations of an insect-pollinated flower (Building confidence)
• 4Adaptations of a wind-pollinated flower (Building confidence)
• 5Compare insect- and wind-pollinated flowers (Stretch)
• 6Explain why the adaptations match the carrier (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Tell pollination and fertilisation apart (Getting started)
• 2The job of the pollen tube (Getting started)
• 3Define fertilisation in plants (Building confidence)
• 4What the ovule and ovary become (Building confidence)
• 5Describe pollination to seed formation (Stretch)
• 6Explain why no fertilisation means no fruit (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the food stored in a seed (Getting started)
• 2Why store food as starch? (Getting started)
• 3The enzyme and its product (Building confidence)
• 4What the glucose is used for (Building confidence)
• 5Describe how a seed uses its food reserves (Stretch)
• 6Explain why a seedling in the dark eventually dies (Stretch)

Model answers (5)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name a method of asexual reproduction in plants (Getting started)
• 2Classify methods as natural or artificial (Getting started)
• 3Describe reproduction by a runner (Building confidence)
• 4Outline how a cutting is taken (Building confidence)
• 5Explain why offspring are clones (Stretch)
• 6Evaluate advantages and disadvantages (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the male and female gametes (Getting started)
• 2Identify a male structure and its function (Getting started)
• 3Name the site of fertilisation (Building confidence)
• 4Trace the path of sperm (Building confidence)
• 5Explain how the uterus is adapted (Stretch)
• 6Describe the female system and its functions (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the hormones controlling the cycle (Getting started)
• 2What happens when progesterone falls (Getting started)
• 3The two roles of oestrogen (Building confidence)
• 4Match the hormone to its role (Building confidence)
• 5Describe the events of the cycle in order (Stretch)
• 6Explain why a period happens if there is no pregnancy (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1State the role of the placenta (Getting started)
• 2Name substances passing to the fetus (Getting started)
• 3Identify the waste leaving the fetus (Building confidence)
• 4Explain why the fetus needs these substances (Building confidence)
• 5Explain why the bloods do not mix (Stretch)
• 6Describe the full role of the placenta (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Define the genome (Getting started)
• 2Define a gene (Getting started)
• 3State where genes are located (Building confidence)
• 4Define an allele and link it to variation (Building confidence)
• 5Arrange the terms from largest to smallest (Stretch)
• 6Explain the difference between a gene and an allele (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the sex hormones and their glands (Getting started)
• 2State changes caused by oestrogen (Getting started)
• 3State changes caused by testosterone (Building confidence)
• 4How amniotic fluid protects the embryo (Building confidence)
• 5Sort changes under the correct hormone (Stretch)
• 6Explain and compare the roles of the two hormones (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response