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ধারণা (Concept) সাহিত্যের ক্ষেত্রে 1990 খ্রিস্টাব্দের শেষের দিকে অথবা 2000 খ্রীস্টাব্দের শুরুতে শিখণ নকশাটির ধারণার উল্লেখ পাওয়া যায়। শ্রেণীকক্ষে পাঠ সুষ্ঠুভাবে উপস্থাপণ করতে হলে একটি সুদক্ষ, সুপরিকল্পিত নকশা শিক্ষককে আগে থেকে তৈরি করে রাখতে হয়, একে বলে শিখণ নকশা, এর ফলে শিখণ উদ্দেশ্য গুলি খুব তাড়াতাডি আয়ত্ত করা যায়। CV Good এর মতে, “Lesson plan […]
Petroleum is the general term for all the natural hydrocarbons found in rocks. It consists of an extremely complex mixture of a large number of different hydrocarbons generally accompanied by small quantities of related compounds containing Nitrogen, Sulphur, and Oxygen. Crude oil in which these hydrocarbons predominate has a paraffin base. The
The morphological characteristics are very useful to taxonomists for the diagnosis and classification of plants. With the progress of scientific research, it becomes clear that only the morphological characteristics are not sufficient enough as the data of studies of other branches of botany have considerable value to assess the proper systematic status and phylogeny of
Water is another name of life. Every living organism needs water to fulfil its biological needs and sustain its growth. But in the case of humans, the water we drink needs to be purified. This is because the surrounding environment may contaminate the water. It can happen through human interactions as well as by natural
Roots of most terrestrial plants form a symbiotic relationship with fugal form, these ubiquitous symbioses are popularly known as Mycorrhizal association or Mycorrhiza. About 90%of land plants show symbiotic arrangements with beneficial performance and have been around for approximately 400 million years. Introduction Roots of most terrestrial plants form a symbiotic relationship with fungi, this
The term Transgenic plants refer to those plants which are developed by modern genetic engineering processes. An integrated application of rDNA technology, gene transfer methods and tissue culture techniques have been made in the development of transgenic plants. This means that more than one gene is introduced and combined with the genetic material of the
Blockchain technology evolves rapidly in modern days. It not only anonymizes the path but also makes it almost impossible to hack or break the system. Digital currencies like bitcoin and Ethereum are also the gift of the blockchain. The future of this is imaginable. Let’s see how? blockchain technology definition Blockchain is basically imaginary blocks
Lichens are a small group of plants of composite nature, consisting of two dissimilar organisms, an alga-phycobiont (mykos- fungus, bios- life) and a fungus-mycobiont (mykes-fungus, bios-life), living in a symbiotic association. Generally, fungal partners cover mostly portion and developed their own reproductive structures. Algal partner produced food through photosynthesis. Important characteristics of Lichens Lichens formed
Dispersal is the phenomenon of transferring Plant parts from one place to another. Dispersal of fruits and seeds are a very common feature in angiosperms which have great importance in their life process because of the following facts. If all the fruits and seeds fall under the parent plant, all may not be able to
Plasticity and Totipotency There are two concepts, plasticity and Totipotency that are important aspects of understanding plant cell culture and regeneration. Plants have sessile nature and a long life span, thus they develop a greater ability to endure extreme conditions and predation than have animals. Hence, they develop various processes related to their growth and