Question

Awn occurs over
A. Palea
B. Lemma
C. Glume
D. Lodicule

Answer 1

It is the lower part of the two chaff-like bracts that enclose the grass floret. It may be similar in shape to the glume.

Complete answer:
The awning is either a hair-or a bristle-like appendage on a larger structure or, in the case of the Asteraceae, a rigid needle-like feature of the pappus. Awns are typical of a number of plant families, including Geraniaceae and several grasses. In grasses, the awnings typically stretch from the lemmas of the flowers. This also occurs in the hairy appearance of grass inflorescence.

Palea refers to one of the spikelet's bract-like structures in Poaceae. The palea is the topmost of the two chaff-like bracts that covers the grass flower. It is always split at the tip, indicating that it may be a double structure resulting from the fusion of two distinct organs.

Lemma is a cytomorphological word that refers to a part of the spikelet. It is the lower part of the two chaff-like bracts that enclose the grass floret. It also carries a long bristle termed as an awn, which can be similar in shape to the glume - chaffy bracts at the base of each spikelet.
The glume is a bract (leaf-like structure) below the spikelet in the inflorescence (flower cluster) of grasses (poaceae) or sedge-like flowers (cyperaceae). There are two other styles of bracts in the grass spikelets: lemma and palea.

Lodicule is a structure consisting of between one and three small scales at the bottom of the ovary in a grass flower that represents the corolla, believed to be a rudimentary perianth. The swelling of the lodicules forces the flower's bracts apart, exposing the flower's reproductive organs.

Thus, the correct answer is option “B”. i.e., Lemma.

Note: Awns may be long or short, straight or curved, single or multiple per flower. Some genera are named for their awns such as the three awns. In certain plants, awns may make a major contribution to photosynthesis, including in barley.