An example of an organ of perennation in plants is

1. Analyze the question "Perennation" means a plant surviving through unfavourable seasons (dry season or cold season) and then growing again when conditions improve. An organ of perennation is a plant part that stores food and survives while the rest of the plant dies back.

2. Explain the concept Organs of perennation are usually underground storage structures that sprout new shoots when conditions are right. Common examples:

• Rhizomes (ginger, turmeric, spear grass)
• Bulbs (onion)
• Corms (cocoyam)
• Tubers (yam, Irish potato)

They are vegetative structures. They let the plant survive and also reproduce asexually.

3. Go through the options

• A. Rhizome: This is a horizontal underground stem that stores food and survives the dry season. It produces new shoots when the rains come. ✔
• B. Seed: Seeds help plants survive harsh conditions as dormant embryos, but they are products of sexual reproduction, not organs of perennation in the standard sense. ✘
• C. Petal: This attracts pollinators and does not store food. ✘
• D. Calyx: This is the sepals, which protect the flower bud. It is not for perennation. ✘

4. Answer The correct option is A, rhizome.

5. Exam tip When you see "perennation", think of underground storage organs: rhizome, bulb, corm, tuber. Remember "Perennation = Persist underground". Seeds are for dispersal and sexual reproduction, while perennating organs are vegetative.