Question

Inflorescence of family poaceae
A. Catkin
B. Spikelet
C. Spike
D. Raceme

Answer 1

Hint: Flowers are arranged differently from plant to plant. The arrangement of flowers on the flower axis (bud system) of a plant is called an inflorescence. The type of inflorescence is taxonomically very important. It has been shown that this feature is constant for the whole family and helps in taxonomic identification.

Complete answer:
The two major type of Inflorescence that occurs in plants are :
Racemose Inflorescence-This type is also known as indeterminate inflorescence. Racemes are flowers in which branches (simple or branched) do not end with flowering, but continue to elongate to a certain point of growth. In this type, motionless stems or flowers are produced either directly or from branches in a somewhat undefined order.
Cymose Inflorescence-This inflorescence is also called a specific or specific inflorescence. In Cymose inflorescences, flower branches (simple or branching) are prematurely closed with one bud, and the next flower gradually develops towards the base of the wick.

The Inflorescence given in the options are different types of Racemose Inflorescence.
-Catkin: Catkin is pendulous spike in leaf axis bears unisexual flowers e.g., Oak, Birch.
-Spikelet: It is a small, special spike flowers are produced in the axis of fertile bracts called lemma ,e.g. wheat, grasses(Poaceae)
-Spike: In this type of Inflorescence peduncle has sessile and bisexual flowers e.g. Achyranthes, Adhathoda.
-Raceme: In this type of Inflorescence peduncle has pedicellate and bisexual flowers which are arranged acropetally e. g., Rhus, Gulmohur.

Hence, the correct answer is option (B).

Note: Racemose Inflorescence-The flowers grow acropetally (i.e., the oldest flower at the base, gradually the youngest flowers and buds to the tip), or centripetal (i.e., the oldest flower, the youngest of the wide fleshy rickets, called pears). Cymose Inflorescence-The flowers are arranged basipetally . The oldest flowers are at the top, and the youngest flowers and buds are gradually found at the bottom or in the centrifuge. The oldest and youngest flowers in the centre of the rickets are juicy and enlarged bowls.