Question

Awn of wheat and barley is developed from
A. Glume I
B. Glume II
C. Lemma
D. Palea

Answer 1

Hint:Awns are long pointy structures present on the florets of certain grass species such as wheat, rice, and barley. Awns give those crops the hairy appearance of grass inflorescence. The awns are formed from the distal ends of the lemma. They protect against attack, help in seed dispersion, and contribute to photosynthetic activity.
Complete step by step answer:
Awns are hair-like extensions present on the surface of certain types of grass species, such as wheat, rice, and barely. Awns can be found in many shapes and sizes, and primarily depend on the function it provides.
Awns extend from the lemma of the plant. The lemma is a modified leaf-like structure present within the spikelet of grasses. The awns are only present within the lemma of the spikelet and the number of awns present or absent from each lemma depends on the species.
The awns serve as a protective covering for the seed present within the florets within the spikelet. Awns also aid in seed dispersion where they help adhere to the fur of various animals, which effectively disperse the seeds. Awns are also considered to play a major role in contributing to photosynthesis. As awns are modified leaflets which are capable of converting sunlight and effectively exchange gases.

Thus, the correct option is C, Lemma.

Note: Awns are needle-like structures present in the florets of grass varieties such as wheat, rice, and barely.
Awns emerge from the lemma of the spikelet.
Spikelets are the arrangement of grass flowers that possess one or multiple florets.
The bottom of the spikelet is attached to two modified leaf life structures called Glume I and Glume II.
The floret within the spikelet consists of other leaf life structures surrounding the actual flower of the grass. The external leaf structure is called the lemma from which awns extend and the internal leaf structure is called the palea.