CHICKEN DEVELOPS DINOSAUR LIKE SNOUT

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 […]

FORMS OF CHROMATIN

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 […]

THE HUMAN BLOOD

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, […]

NUTRITION IN PARAMECIUM

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 […]

INTRODUCTION TO SEXUAL REPRODUCTION

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 […]

PHOTOSYNTHESIS

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 […]

INTRODUCTION TO 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 […]