IB Biology HL 2.3.10 Gamete Adaptations Question Bank

Practise IB Biology HL 2.3.10 through exact HL questions on sperm ATP supply, mature-egg structure and gamete adaptations for fertilisation.

Exam points

Relate sperm mid-piece mitochondria and tail structure to ATP supply and motility.
Identify structural adaptations of a mature human egg from a labelled diagram.
Use gamete ultrastructure to explain how egg and sperm adaptations support fertilisation.

[Maximum number: 5]

Draw a labelled diagram of a mature human egg.

Award [1] for each structure accurately drawn and correctly labelled.
a. haploid nucleus;
b. cytoplasm - with nucleus-to-membrane distance >4 times nucleus diameter;
c. centrioles - two must be shown but only one needs to be labelled;
d. cortical granules - needs to be drawn in vicinity of plasma membrane;
e. plasma membrane - shown as a single line and approximately circular overall;
f. polar cell / (first) polar body - needs to be drawn outside the egg cell;
g. zona pellucida / layer of gel (outside the cell membrane);
h. follicle cells / corona radiata (outside the cell membrane);
i. size shown as $100 \mu \mathrm{~m} / 0.1 \mathrm{~mm}$ ; (accept $90 \mu \mathrm{~m}$ to $120 \mu \mathrm{~m}$ )

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B2.3.10 (HL)—Gamete adaptations question 1