Question

in morphology....explain flower on the basis of symmetry,petals position of thallamus

Answer 1

you can classify them into types of aestivations;

• valvate
• imbricate
• vexillary
• twisted

Answer 2

The region, where internodes are condensed, forms the broad base of the flower and lies at the tip of pedicel is called thalamus (= torus = receptacle). The numbers of appendages or floral leaves borne on each node are differentiated and more numerous than the foliage leaves on the nodes of a vegetative shoot.

There are four types of floral organs— sepals (green), petals (coloured other than green), stamens (= microsporophyll’s) and carpels (= megasporophylls).

Sepals and petals are nonessential or accessory floral organs or floral leaves which do not take any direct part in sexual reproduction. Stamens and carpels are essential organs. They are sporophylls which are directly involved in sexual reproduction.