A-Level Biology Specification

OCR B H422

Section 4.4.1: Plant reproduction

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#4.4.1a

the control of flowering in plants

To include the role of vernalisation and phytochrome in the timing of flowering.

#4.4.1b

adaptations of flowers for pollination

To include adaptations of both wind-pollinated flowers (e.g. cereals) and insect-pollinated flowers (e.g. legumes).
PAG2

#4.4.1c

fertilisation and seed formation

To include the growth of the pollen tube, the formation of the embryo and the formation of the endosperm (in outline only).
PAG2

#4.4.1d

(i) the germination of seeds

(ii) investigations into the factors affecting germination

To include the role of gibberellin as a cell signalling molecule.

#4.4.1e

the importance of cereals as staple foods

To include a consideration of the global use of rice, maize and wheat, and issues relating to food security and sustainability.