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SCIENCE AND TECHNOLOGY

Respiration in Plants

Respiration in Plants Updated

🕔14:04, 29.Jan 2015

PRELUDE All organisms needs energy for their life activities. This energy is obtained by a process called respiration. Respiration. Is a catabolic process which involves the stepwise oxidation of glucose in a living cell to release energy. Respiration. It of

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Plant Anatomy

Plant Anatomy Updated

🕔13:58, 29.Jan 2015

PRELUDE Internal Structure of a dicot and monocot root The cross-section of a dicot root shows the following: Epiblema/Piliferous layer. It is a single outer most layer of thin walled cells. The outer walls of these cells extents to form

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Photosynthesis – An Introduction

Photosynthesis – An Introduction

🕔13:38, 29.Jan 2015

PRELUDE Photosynthesis means synthesis of glucose with the help of light. Green plants trap solar energy and convert it into chemical energy. The green plants are called as autotrophs. The Raw Materials. Needed for photosynthesis are carbon dioxide and water.

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Nutrition and Respiration

Nutrition and Respiration

🕔13:25, 29.Jan 2015

PART A: NUTRITION Brief Resume Nutrition is a process of intake and utilization of nutrients either as an energy source or for biosynthesis of body constituents.  In Autotrophic nutrition, the organisms utilize the inorganic raw materials to synthesis their own

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Nervous System and Sense Organs

Nervous System and Sense Organs

🕔13:01, 29.Jan 2015

PRELUDE The nervous system keep us informed about the outside world through the sense organs. Neuron. The functional unit of nervous system. Each neuron in made up of the cell body, dendrites, dendrons and axon. Nerves. Consist of bundles of

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Excretion in  Animals, Humans, Plants

Excretion in Animals, Humans, Plants

🕔17:09, 28.Jan 2015

Waste materials excreted in animals are of many kinds; nitrogenous substances, carbon dioxide, pigments, excess water, etc. The nitrogenous waste can be excreted in the following forms: Ammonia: Highly toxic, soluble in water and has to be immediately excreted. In

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Transpiration – Stomatal, Cuticular, Lenticular

Transpiration – Stomatal, Cuticular, Lenticular Updated

🕔16:49, 28.Jan 2015

PRELUDE Transpiration is the lose of water in the form of water vapour from aerial parts of the plant. There are three types of transpiration: Stomatal Transpirtion. Through stomata. Cuticular Transpiration. Through cuticle of leaves and green herbaceous stems. Lenticular

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Tissues and Types of Tissues – An Introduction

Tissues and Types of Tissues – An Introduction

🕔16:36, 28.Jan 2015

PRELUDE In a unicellular organism all life processes are carried out by the cell itself. In a multicellular organisms these processes are carried out by similar cells called tissues. Tissue-A tissue is a group of cells with similar structure and

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The Respiratory System

The Respiratory System

🕔16:03, 28.Jan 2015

PRELUDE The various life processes in our body require energy. This energy is obtained by respiration of food that we eat. Respiration- It is the stepwise oxidation of glucose to release energy in the body cells. The energy produced by

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The Reproductive System

The Reproductive System

🕔15:50, 28.Jan 2015

PRELUDE All living organisms reproduce their own kinds to maintain the continuity of their race. Reproduction. Means to produce new organisms of the same species. Reproduction is of two type – Asexual and sexual. Asexual reproduction means to reproduce without

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The Circulatory System

The Circulatory System Updated

🕔15:00, 28.Jan 2015

HUMAN HEART AND ITS FUNCTIONING Size 12 × 9 cm and 300 gm weight Enclosed in a tough, 2-layered connective tissue sac, the pericardium. Has 4 chambers: 2 upper smaller auricles and 2 lower larger vent rides. The right auricle

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The Cell Structure and Composition

The Cell Structure and Composition

🕔13:59, 28.Jan 2015

PRELUDE  Cell. The structural and functional unit of life. Robert Hooke. Coined the term ‘Cell’. Largest Cell. Ostrich’s egg. Protoplasm is the physical basis of life. Cell Organelles. The living structures present in the cell. Cell Inclusions. The non-living substances

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Skeletal System

Skeletal System Updated

🕔16:46, 26.Jan 2015

* Skeletal system constitutes hard internal or external living or non-living paces that form the supporting framework of body. * It is divided into 2 parts: * Exoskeleton: It is hard, protective and supportive frame-work which is produced by ectoderm.

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Radioactivity

Radioactivity Updated

🕔15:36, 23.Jan 2015

Introduction  Radioactivity was discovered by a French physicist Henry Bacquerel in 1896. The term radioactivity was given by  Marie Curie, the scientist who got Nobel Prize twice for physics and chemistry The spontaneous emission of invisible radiation by some elements

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Organic Chemistry

Organic Chemistry Updated

🕔15:10, 23.Jan 2015

Organic Compounds Chemistry of hydrocarbons and their derivatives is dealt with in organic chemistry. Urea was the first organic compound prepared in laboratory. It was prepared by Wohlar. Acetic acid was the first organic compound synthesised from its elements by

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