In this article we will discuss about the four main types of root stem transition in angiosperms. Type A (Fig. 16.1.1A-1E): This type is represented by Dipsacus, Mirabilis and Fumaria. In the root there are four strands of phloem and four strands of xylem with exarch protoxylem. They are arranged radially. The stem shows four conjoint collateral vascular bundles with [...]
In this article we will discuss about:- 1. Origin of Angiosperm 2. Size of Angiosperm 3. Habit 4. Life Span 5. Habitat 6. Nutrition. Origin of Angiosperm: Flowering plants or angiosperms are the most recent, most advanced, most evolved, most conspicuous and abundant of all the plants. They appeared about 130 million years back but comprise about 3, 00,000 species [...]
The below mentioned article provides study notes on Dicots and Monocots. Angiosperms are divided into two subgroups, dicotyledonous and monocotyledonous plants, mainly on the basis of number of embryonic leaves or cotyledons. The two are commonly spoken as dicots and monocots. Dicots: They are angiospermic or flowering plants which are characterised by the presence of two cotyledons in the seed, [...]