Calculate the difference (in mm²) in the mean leaf area of L6 at the start of stage 4 between the leaves of plants grown in long days and short days.

The graph shows how the mass of a bean seed from which all water has been removed (dry mass) changes during germination.

What can be deduced from the graph?

A. The plant loses more water during period X than during period Y.

B. During period Y, photosynthesis occurs but not respiration.

C. During period Y, more CO₂ is fixed in photosynthesis than is released by cell respiration.

D. The seeds were not exposed to the correct temperature for germination during period X.

Plants have widespread influences, from food chains to climate change.

Draw a labelled diagram of the internal structure of a seed.

Suggest reasons for the difference in end of day starch concentrations in stage 2 (S2) for the plants grown in long days and short days.

Explain how some plant species are able to respond to changes in their abiotic environment and flower at a precise time of the year.

The image shows a cross-section of a flower.

[Source: © International Baccalaureate Organization 2019]

Where does production of haploid gametes occur?

A. I and II only

B. III and IV only

C. I and III only

D. II and IV only

Draw a half-view of an animal-pollinated flower.