TREE THAT RELEASES OXYGEN ROUND THE CLOCK


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Usually plants take CO2 and release oxygen during day (due to photosynthesis) and they take O2 and release carbon dioxide during night as a result of respiration. But it has been found that Peepal tree (scientific name Ficus religiosa) releases oxygen 24 hours a day. How is it possible that a plant releases oxygen throughout Read More

CHICKEN DEVELOPS DINOSAUR LIKE SNOUT


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Scientists have succeeded in creating a chicken embryo having dinosaur like snout. This is seen as a evolutionary evidence of birds from dinosaurs. The idea that birds evolved from dinosaurs has been raised since 19th century when the scientists discovered the fossil of an early bird Archaeopteryx. Archaeopteryx had wings and feathers like birds but Read More

FORMS OF CHROMATIN


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Generally Chromatin is of two types: 1. Euchromatin: It has looser DNA packaging. It contains less DNA. It is lightly stained when observed under microscope. Transcriptionally active. It is found in both eukaryotes and prokaryotes. 2. Heterochromatin: It has tighter DNA packing. It is dark stained when observed under microscope. It contains more DNA. Transcriptionally Read More

STRUCTURE OF NUCLEOTIDE


NUCLEOTIDE

Nucleotides are the basic units of nucleic acids (DNA and RNA). Nucleic acids are biomolecules essential for all forms of life. A nucleotide has 3 components:  1. Pentose sugar 2. Nitrogenous base 3. Phosphate sugar Pentose Sugar It is a monosaccharide with 5 carbon atoms. It forms the backbone of polynucleotide chain. It is also Read More

THE HUMAN BLOOD


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Blood is a red coloured liquid that circulates in our body. The main components of blood are: 1. Plasma 2. Red Blood Corpuscles (RBC) 3. White Blood Corpuscles (WBC) 4. Platelets 1. Plasma: Plasma is a colourless liquid which consists of water and many substances like proteins, digested food etc are dissolved in it. RBC, Read More

NUTRITION IN PARAMECIUM


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Paramecium is a tiny unicellular organism found in water. It follows holozoic mode of nutrition. 1. Ingestion: Paramecium engulfs food by the use of cilia. Cilia is a hair like structure present on surface on body of paramecium. Food is ingested by cilia through oral groove into gullet. The food is ingested with a little Read More

INTRODUCTION TO SEXUAL REPRODUCTION


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Sexual reproduction is a mode of reproduction in which an offspring is formed by two parents (different individual of opposite sex). Sexually reproducing organisms are needed to reach certain stage of growth and maturity before reproducing. Despite several variations in morphology and internal structure organisms show same pattern of life or we can say that Read More

PHOTOSYNTHESIS


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Photosynthesis is a process by which plant prepare their food from carbon dioxide and water with the help of sunlight in the presence of chlorophyll. About 90% of photosynthesis is carried out by aquatic plants. Word ‘Photosynthesis’ comprises of two words ‘photo’ & ‘synthesis. Photo means light and synthesis means preparation. Thus photosynthesis is a Read More

INTRODUCTION TO LIFE PROCESSES


Life processes

Life processes are the basic functions performed by living organisms to survive on earth. It has to be performed uninterruptedly in both active and inactive stage of organism. Some of the life processes are nutrition, respiration, transportation, excretion, control and coordination, growth etc. Every living organism needs energy for performing every life processes. NUTRITION:   Nutrition Read More

ABIOTIC FACTORS OF ENVIRONMENT


Abiotic factors of environment

1. Temperature It is the most important factor plays a significant role in determining the habitat. A few organisms, that can tolerate a wide range of temperature, are called Eurythermal, and the majority of the organisms that tolerate a narrow range of temperature, are known as Stenothermal. The temperature ranges from 0o C in polar Read More