CBSE ADDA

In 2024, CBSE announced board results for classes 10 and 12 on 12th May. For the first time, both class 10 and class 12 students got their results on the same day. We noticed mixed reactions to the performance of the students. However, officially there was a decline of 5% in the pass percentage of the students. Many students are now willing to apply for rechecking of marks. Here are the step-by-step guidelines that will help you understand the whole process quickly. Class 12th Rechecking Process In CBSE board exams, rechecking is a three-step process and no one can skip any step. Here are the steps: Verification of Marks Photocopy of Answer Book Re-evaluation of Answers Rechecking Steps to Follow Let’s understand the whole process in points: Requests for all the processes will be accepted only Online and during the specified schedules along-with processing charges. No application after the scheduled date and time and in offline mode will be accepted. The processing charges can only be

1. Tissue is a group of cells having similar origin, structure& function. Study of tissues is called Histology 2. In unicellular organism (Amoeba) single cell performs all basic functions, whereas in multi-cellular organisms (Plants and Animals) shows division of labor as Plant tissue & Animal tissues. 3 . Plant tissues are two types : Meristems & Permanent tissues. 4. Meristems: The Meristems are the tissues having the power of cell division. It is found on those region of the plant which grows. 5. Types of Meristems; 1. The Apical meristems – It is present at the growing tip of the stem and roots and increases the length. 2. The lateral meristems - present at the lateral side of stem anf root (cambium) and increases the girth. 3. The intercalary meristems - present at internodes or base of the leaves and increases the length between the nodes. ( Please refer to Fig. 6.2: location of meristems in plant body , NCERT Book Page- 69). 26. Perman

Microorganisms Definition The organisms which cannot be observed with the naked eye and can be seen only through a microscope are called microorganisms or microbes. Food and water become unsafe for consumption due to the presence of harmful organisms, commonly referred to as germs . These germs are so small that they are invisible to the naked eye, but can often cause dangerous diseases. Since these organisms can be seen only through a microscope, they are called microorganisms or microbes. When the body is attacked by germs or pathogens, medicines called antibiotics are given. Antibiotics act against the bacteria within the body, without harming the person. Microorganisms Microorganisms are present in the air, water, food and even inside our bodies. While a majority of the microbes are harmless, some of them have the capability of causing dangerous diseases. Microorganisms Bacteria Algae Fungi Protozoa Vir

8 th synthetic materials Þ          Synthetic materials are kinds of materials obtained from the synthesis of chemicals. Þ      The chemicals used for synthetic materials are obtained from petroleum and natural gas(methane) Þ      Petroleum and natural gas is compound of hydrogen and oxygen called hydrocarbon. Þ      Monomers are simple chemical molecules of hydrocarbon. Þ      When monomers join end to end form a long chain of monomers called polymers. The process of the formation of polymers is called polymerization. Þ      Cellulose [beet root] is polymers of glucose while Hemoglobin is polymers of amino acid. Þ      Fibres are thin thread like materials used to prepared cloths. Þ      Fibres obtained on mixing natural and synthetic fiber are called semi synthetic fibre. e.g. rayon Rayon Þ      Rayon is synthetic fibres obtained from cellulose. Þ      Rayon are of three types: Viscose Cupreammonium (cupro)  and acetate rayons. Viscose Rayon Þ      In ind