Pollination Types — Past Paper Exam
Self-Pollination · Cross-Pollination · Diagram Analysis
Define self-pollination.
Is self-pollination considered asexual reproduction? Explain your answer.
State TWO advantages of self-pollination for a plant.
State TWO disadvantages of self-pollination for a plant.
Explain why self-pollination can still result in offspring that are NOT genetically identical to the parent.
Define cross-pollination.
Explain why cross-pollination leads to greater genetic variation in offspring compared to self-pollination.
State TWO features of a wind-pollinated flower that promote cross-pollination.
Describe how an insect-pollinated flower is adapted to ensure cross-pollination rather than self-pollination.
Compare self-pollination and cross-pollination. (3 marks)
Pollen travels from Flower X to Flower Y on the same branch of the same plant. State the type of pollination.
A bee carries pollen from Plant A (rose bush 1) to Plant B (rose bush 2 of the same species). State the type of pollination.
A plant produces pollen that lands on the stigma of the same flower. Name this process and state whether it is sexual or asexual reproduction.
The diagram below shows two plants of the same species. An arrow shows pollen moving from the anther of Plant 1 to the stigma of Plant 2. (a) Name the type of pollination shown. (b) Name the vector likely responsible. (c) Suggest how you could tell this from the flower structure.
A student investigates whether self-pollination or cross-pollination produces more seeds in tomato plants. (a) State the independent variable. (b) State ONE variable that must be controlled. (c) Describe how you would carry out the investigation. (d) Predict the result if cross-pollination produces more seeds.
Golden Rules — Pollination Types
Self-pollination = anther → stigma of SAME PLANT (same or different flower on same plant).
Cross-pollination = anther → stigma of DIFFERENT PLANT of the SAME SPECIES.
Both are SEXUAL reproduction — both involve fusion of nuclei (gametes).
'Same species' is the critical mark-scoring phrase for cross-pollination.
Self-pollination is more reliable; cross-pollination produces greater genetic variation.
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