Pollen Tube & Fertilisation
Pathway, destination, and experimental design · 15 Questions · 30 Marks
After pollination, a pollen grain lands on the stigma. Describe how the male gamete reaches the female gamete.
Name the structure on which a pollen grain lands before germination.
Name the structure the pollen tube must grow DOWN through to reach the ovary.
State the direction of pollen tube growth and name the TWO structures it passes through in order.
What provides the energy for pollen tube growth?
Into which specific structure inside the ovary does the pollen tube finally enter? Describe what happens at this point.
Distinguish between the ovary and the ovule. State the role of EACH in fertilisation.
What is the micropyle and why is it important during fertilisation?
After fertilisation, state what the ovule and the ovary wall each develop into.
Describe the full journey of the pollen tube from germination to fertilisation, naming ALL structures it passes through in the correct order.
A student observes a pollen tube growing in a sugar solution under a microscope. State ONE variable the student should keep constant in this investigation and explain why.
In an experiment measuring pollen tube length at different sucrose concentrations, state the independent variable and the dependent variable.
A student measures pollen tube length as 0.45 mm using a microscope with a ×40 objective lens and ×10 eyepiece. Calculate the actual size of the tube. Show your working.
Describe how you would set up an experiment to investigate the effect of temperature on pollen tube growth. Include: apparatus, method, and how you would record results.
Suggest ONE safety precaution when handling pollen samples in the laboratory and give a reason for it.
Limitless · IGCSE Biology 0610 · Topic 16.3.7 · Pollen Tube & Fertilisation
Cambridge Assessment International Education — For examination from 2026
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