Question

The flower in which the thalamus grows upward enclosing the ovary is known as…………….

Answer 1

There are different types of flowers based on the insertion of floral leaves. The various floral parts are arranged according to the relative position of gynoecium. Flowers can be hypogynous, perigynous, and hypogynous accordingly. Perigynous flowers are found in plum, rose, peach.

Complete answer:
-In a perigynous flower, the thalamus grows upwardly and forms a cup-shaped structure.
-the floral parts are attached to the margin of the thalamus except for the gynoecium as it lies at the basal part.
-So, in this condition, the gynoecium is observed to be situated below the floral parts.
- In this condition, the ovary is said to be half inferior.
-Hypanthium refers to the fusion of stamens, petals, and sepals which form a floral tube-like structure.
-This hypanthium surrounds the ovary as it is attached to a receptacle below the gynoecium.
-Perigynous flowers are considered to be the most advanced.
-Gynoecium is located at the center.

Additional information:
-In hypogynous flowers, petals, sepals, and stamens are situated below the ovary. The ovary is superior here as in mustard, china rose, and brinjal.
-In an epigynous flower, petals, sepals, and stamens are situated above the ovary. The rest of the floral parts are superior. It is found in guava, apple, cucumber, and in ray florets of sunflower.
-Gynoecium can be monocarpellary or multicarpellary.

Note:
Gynoecium is the fourth and second essential whorl of a flower. It is the female part of a flower consisting of the inner whorl of megasporophylls in the form of carpels bearing ovules. It is composed of an ovary, style, and stigma. The basal part of the ovary is enlarged where the style is attached in the form of the elongated tube, this style connects both the ovary and the stigma. The tip of the style is usually the stigma and is a receptive surface for pollen grains.