DP Biology (first assessment 2025)

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Question 23M.2.HL.TZ2.3

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Date May 2023 Marks available [Maximum mark: 5] Reference code 23M.2.HL.TZ2.3
Level HL Paper 2 Time zone TZ2
Command term Outline, State, Suggest Question number 3 Adapted from N/A
3.
[Maximum mark: 5]
23M.2.HL.TZ2.3

The drawing shows a flower of red valerian, Centranthus ruber.

(a)

State the name and function of structures I and II.

Structure I name and function: ..............................................................................................................

..........................................................................................................................................................

Structure II name and function: .............................................................................................................

..........................................................................................................................................................

 

[2]

Markscheme
  1. I is the stigma which receives the pollen/where pollen lands/is captured (during pollination);
  2. II is the anther and produces/contains/releases pollen;

Both name and function must be included in each marking point.

The role in pollination should be stated. Do not accept “pollination” on its own.

(b)

Structure III is the ovary. Outline the processes that occur in the ovary.

[2]

Markscheme
  1. female gamete/ovule is produced/meiosis to produce ovules/ovule develops;
  2. Fertilisation occurs
    OR
    fusion/union of male and female gametes/nuclei;
  3. development of seed (from fertilised ovule);
  4. development of fruit (from the whole ovary);

Mpb: Do not accept union of pollen and ovule (Too vague).

Do not accept carpel/pistil as equivalent of ovary

(c)

Structure IV contains a gland that secretes a sugary liquid. Suggest a benefit to the plant of secreting this liquid.

[1]

Markscheme
  1. attracts an insect/animal/which pollinates the flower;
  2. attracts a pollinator;

Mpa: Both parts of the sentence are needed to award the point.

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