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 […]

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 […]

RESPIRATION

Respiration is a complex process that includes the combination of breathing and cellular respiration. Breathing: Breathing is exchange of gases i.e intake of oxygen from the atmosphere and release of carbon dioxide. Cellular respiration: It is the complex catabolic process, in which the biochemical oxidation of nutrients takes place for the production of energy in […]

NUTRITION IN GREEN PLANTS

Green plants prepare their own organic food (starch) from inorganic sources by the process of photosynthesis. They are autotrophic in nature Photosynthesis: photo – light; synthesis = putting together. It is the process of conversion light energy into chemical energy in which the inorganic components like carbon dioxide and water (CO2 and H2O) are utilised […]

DIGESTIVE SYSTEM IN HUMAN BEINGS

Human beings are heterotrophic omnivorous organisms. They obtain food from plants and animals by holozoic mode of nutrition. The human diet includes · Carbohydrates · Fats · Proteins · Vitamins · Minerals · Water The human digestive system consists of alimentary canal and digestive glands. Alimentary canal: [Digestive tract] The alimentary canal is a long […]

NUTRITION IN AMOEBA

Amoeba is a unicellular protozoan and the mode of nutrition is holozoic. It is omnivorous in nature i.e, it can take both plants and animals as food source. Amoeba feeds on unicellular plants or animals such as paramoecium. The various steps of nutrition are ingestion, digestion, assimilation and egestion. Amoeba sends out finger like pseudopodia […]

NUTRITION

The process of intake of food and its utilization by the body is called as nutrition. Depending on the mode of obtaining nutrients all the organisms, broadly classified into two groups: (1) Autotrophic                             (2) Heterotrophic AUTOTROPHIC NUTRITION: Auto – self; troph – nutrition. The mode of nutrition in which organisms prepare their own food from […]