IB Biology HL B2.3.10 Hl Gamete Adaptations Questions

Explore how sperm and secondary-oocyte ultrastructure—including mitochondria, flagellum, zona pellucida and nutrient-rich cytoplasm—supports human fertilisation in IB Biology HL…

Exam points

Relate the mitochondria-rich sperm mid-piece to ATP supply for flagellar motility.
Identify and label mature human egg structures including haploid nucleus, nutrient-rich cytoplasm and protective envelopes.
Use sperm and egg ultrastructure to explain how complementary gamete adaptations support fertilisation.

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Study B2.3.10 (HL)—Gamete adaptations conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[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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IB Biology HL B2.3.10 Hl Gamete Adaptations Questions question 1