Question

Three plants, Mustard, Calotropis, and Guava, are collected. There are 30 nodes in Mustard, 30 nodes in Calotropis, 25 nodes in Guava are present. Find the number of leaves put together in all three plants?

• A. 140
• B. 160
• C. 180
• D. 220

Hint:

The number of leaves on a plant often depends on its leaf arrangement: alternate (1 leaf/node) or opposite (2 leaves/node). Mustard has alternate leaves, while Calotropis and Guava have opposite leaves.

Answer 1

The Correct Option is A

To find the total number of leaves on the three plants, we calculate the number of leaves each has based on its leaf arrangement and node count.

1. Relationship between nodes and leaves:
   Typically, one leaf grows per node unless the plant exhibits an opposite or whorled arrangement. We assume:
   • Alternate arrangement → 1 leaf/node
   • Opposite arrangement → 2 leaves/node
2. Mustard (Brassicaceae):
   Alternate leaf arrangement ⇒ 1 leaf/node × 30 nodes = 30 leaves
3. Calotropis (Apocynaceae):
   Opposite leaf arrangement ⇒ 2 leaves/node × 30 nodes = 60 leaves
4. Guava (Myrtaceae):
   Opposite leaf arrangement ⇒ 2 leaves/node × 25 nodes = 50 leaves
5. Total Leaves:
   Mustard (30) + Calotropis (60) + Guava (50) = 140 leaves
6. Correct Option: (1) 140

✅ Final Answer: 140 leaves