Sexual Reproduction in Flowering Plants Test - 7

The outermost whorl of flower is green leafy structure, called sepals. Sepals protect the flower in buds stage. It is generally attached with thalamus of the flower.

Pollen grains are formed inside the anther. Stamen contains filament and anther. Inside the anther microsporogenesis process takes place to produce haploid pollen grains that forms male gametes.

Monoecious flowers contain both male and female reproductive parts that are androecium and gynoecium. Androecium produce male gametes and gynoecium produce female gametes.

Flower is a modified shoot because it develops in the axils of bracts like axillary shoots. New buds also develop at node inside the axils of bracts of leaves.

In some flowers, there is no distinction of sepals and petals. In these flowers these non-essential organs are together called as perianth. The individual parts of perianth are called tepals.

Pistil is a flash shaped structure having basal swollen ovary, stalk like style and terminal receptive part called stigma. Ovules are formed inside the ovary of the pistil. Hence option A is correct.

In hypogynous flowers thalamus is convex or conical, ovary at the top and other floral organs below the ovary. Such flower are also called as ovary superior as in Mustard and Brinjal flowers.

Activation is the arrangement of accessary floral organs in relation to one another in the bud condition. Activation may be open, valvate, twisted and imbricate.

Actinomorphic flowers have radial symmetry. It is regular in arrangement and two equal halves are formed by any vertical division passing through the centre. Hence, only statement a is correct.

In Epigynous flower, the other floral organs are borne at the top of the ovary and ovary is below. Hence they are called ovary inferior while other floral parts are superior to ovary.