Read this article in Hindi to learn about the aerial modifications of stems, explained with the help of suitable diagrams. भूमि के बाहर का सामान्य तना भी कुछ पौधों में विशेष कार्य, जैसे आरोहण, रक्षा, भोजन निर्माण, वर्धी प्रजनन आदि के लिए रूपान्तरित हो जाता है । कुछ महत्त्वपूर्ण उदाहरण नीचे दिये जा रहे हैं: 1. अंगूर (Vitis): i. यह [...]
In this article we will discuss about the common anomalous structures that occur in stems. A great diversity in the arrangement of vascular tissues is exhibited by the angiosperms in their stems. The arrangements, which exist in majority of the plants, are considered as normal. The variations are regarded as anomalous though the so-called anomalous structure is normal for the [...]
In this article we will discuss about the secondary growth in monocotyledonous stem. Most monocotyledons consist entirely of primary tissues. The usual vascular cambium is absent from this group and so there is no normal secondary growth. However, in some monocots, the thickening and elongation of stem occurs through primary thickening meristem, diffuse secondary thickening and secondary thickening meristem. Primary [...]