Question

since tendrils and spines can either be modified leaves or modified stems how would you determine the origin of a given specimen?​

Answer 1

Leaf Tendrils

Leaf tendrils exist in plants with weak stems. The leaves get modified into thread-like structures called tendrils. These tendrils climb a nearby stick or wall and provide support to the plant. For eg., In Lathyrus aphaca, the whole leaf is modified into tendrils. The upper leaflets of Pisum sativum get modified into tendrils.

Leaf Spines

A few plants have their leaves modified into needle-like structures known as spines. The spines act as defensive structures. They also reduce water loss due to transpiration. For eg., in Opuntia, the leaves are modified into spines.

Answer 2

Leaves are generally responsible for the process of photosynthesis but they also show different types of modifications like leaf tendrils and leaf spines.

Explanation:

Leaf Tendrils:-

• In some plants, leaves modified into tendrils. They are long slender, thread-like, sensitive structured which provide the plant support while climbing.
• For example:- Peas, sweet pea.

Leaf Spines:-

• In some plants, leaves are modified into small, sharp-pointed structures which reduce transpiration and protect the plants from browsing animals.
• For example:- Aloe, cactus.