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 a study note on Angiosperms - The Flowering Plants. Angiosperms are those seed plants in which seeds are formed inside fruits and the sporophylls are organised into flowers. 1. Flowering plants or angiosperms are the most recently and highly evolved plants. They appeared on earth about 130 million years ago. First angiosperm fossil recorded from [...]