DENDROLOGY

Detailed explanation-1: -All sunflowers (Helanthus annus) are dicots, they are dicotyledonous, meaning they have two cotyledons (baby leaves) when their seed germinates. Monocots have only one baby leaf when they emerge. Grasses are a good example of a monocot. So, the correct answer is ‘Two cotyledons’.

Detailed explanation-2: -Plants producing seeds with two cotyledons are called dicots.

Detailed explanation-3: -The epigeal sunflower cotyledons develop chlorenchyma tissues organized similarly to those of any dorsiventral true leaves, when exposed to light. These cotyledons are normally green and live about 28 d after germination and are thus suitable for studying the formation of their photosynthetic apparatus.