In this article we will discuss about the structure of a leaf with the help of a diagram. A leaf is a compromise between two conflicting evolutionary pressures. The first is to expose a maximum photosynthetic surface to sunlight; the second is to conserve water while, at the same time, providing for the exchange of gases necessary for photosynthesis. The [...]
Read this article in Hindi to learn about the various type of leafs, explained with the help of suitable diagrams. Type # 1. नागफनी (Opuntia): i. यह नागफनी की टहनी है। ii. इसकी पत्तियाँ शूलों (spines) के रूप में रूपान्तरित हो गई हैं । iii. शूलों के रूप में पत्तियाँ एक रूपान्तरित तने पर्णाभ पर लगी हैं । iv. एक-एक [...]
In this article we will discuss about the arrangements of tissues in leaves. Leaves are generally flat organs and to differentiate the two surfaces different terms are used. The surface that faces the stem upwardly is designated as upper surface or adaxial surface whereas the other surface is the lower or abaxial surface. Anatomically a leaf comprises the usual three [...]