Polarity is defined as the condition of having distinct poles in a pollen grain. Jackson in 1928 assumed that a pollen grain points to the poles like Silphium. Silphium laciniatum, also known as compass plant, has leaves that 'turn their edges north and south and avoid the mid-day radiation' —Willis. Pollen mother cell after meiosis forms four pollen grains that [...]
In this article we will discuss about the plant cell which is the fundamental unit of all living organisms in terms of structure and function. This will also help you to draw the structure and diagram of plant cell. History of Discovery: Robert Hooke in 1665 first discovered plant cell. The term 'cell' was coined to describe the small walled [...]
The following points highlight the four common types of spore found in embryophytes. The types are: 1. Isospore (n., pl. -s, syn. Homospore) 2. Heterospore (n., pl. -s; hetero- a Greek Prefix Meaning 'different', 'not normal') 3. Meiospore (n., pl. -s) 4. Miospore (n., pl. -s; in Greek Meion means 'less', 'smaller'). Type # 1. Isospore (n., pl. -s, syn. [...]