Question

Leaf apex is modified into tendril in.
A. Smilax
B. Gloriosa
C. Australian acacia
D. Pisum

Answer 1

Hint: The leaf is the part of the shoot system which present on the branches of plants that possess chloroplast and stomata, which perform photosynthesis and transpiration process respectively, the leaf shows a modification in different plant species, that perform different functions which is an adaptive feature.

Complete answer:
The leaf may be modified and develop, into a different structure which performs a different function in different plant species such as, in xerophyte plant leave to change into the spine to reduce the transpiration process and in case of insectivorous plant leaf develop a vessel which is used to capture the prey to get their nutrition.
Smilax:- It is the genus of plant that belongs to the family Smilacaceae which represents the woody and herbaceous plant species that are known as carriers and greenbriers, it has a crawling vine which entangles itself and with other plant and climbs upward by the help of tendrils.
Gloriosa:- It is the perennial herb, which is an angiosperm plant that is distributed in the monocot plants, in this plant the apex of the leaf is developed into a tendril, that helps in attachment, support, and cellular invasion of other plants.
Australian acacia:- It is also known as mimosa or wattle, it is the genus of shrub and tree that belongs to the family of Fabaceae. It holds a range of foliage, true leaf divided into leaflets and group wattles develop into phyllodes.
Pisum:- It is also a genus of Fabaceae and it consists of five species and native to northeast Africa and south-west Asian countries. In this plant leaf, the upper few leaflets are transformed into tendrils but the rest of the leaves are normal.
Hence, the correct option is B.

Note: The leaf of the plants develop or transform into a different structure such as leaf tendrils, leaf spines, leaflet hooks, phyllodes or phyllodia, leaf bladders, leaf pitcher, succulent leaf, scale leaf, coloured leaves, and floral organs.