Structure of Phospholipid: Phospholipids are the triglyceride lipids where one fatty acid is replaced by phosphoric acid, attached to additional nitrogenous group like choline in lecithin phospholipid. The two fatty acids hydrocarbon chains and glycerol functions as hydrophobic (water-repellant) and forms the non-polar tail of the phospholipid molecule; whereas phosphate and nitrogenous compound, choline functions
Respiration: Respiration is the process of taking oxygen into the cells, using it to release energy from the digested food and eliminating the waste products (carbon dioxide and water). Respiration involves two main processes: Breathing or External Respiration: The process of taking in oxygen-rich air from the surrounding medium and giving out carbon dioxide-rich air
Conservation of Soil: There are two basic ways of conserving soil- Preventing Soil Erosion: The removal of the top fertile soil by any agency like wind or water is called soil erosion. It is very harmful as it can lead to landslides and other imbalances in nature. Moreover, it takes 900 years for a single
Metabolism: The release of energy from food occurs in two stages. In the first stage, when complex molecules are broken down or decomposed into simpler ones. In the second stage, when the simpler food components (example- glucose) are oxidized in cytoplasm and mitochondria using oxygen of the air into CO2 and H2O and releasing an
Working of Nitrogen Cycle in Nature: Nitrogen is an essential constituent of all living organisms, namely, plants and animals. The atmosphere is the chief source of nitrogen. It is estimated that the atmosphere alone contains four thousand billion tonnes of nitrogen. Only a small quantity of nitrogen is present in the combined state and it
Knowledge of Biology is useful in Agriculture: Biology deals with the study of living things- plants and animals. It has two divisions- Botany (the study of plants) and Zoology (the study of animals). The knowledge of biology is useful in agriculture in the following ways- It helps us to know various life activities going on
Properties of water that may have favoured origin of life in it: Water is essential for life. Life and water are inseparable. Life first originated in water. If liquid water is available on other planets, life could be expected to originate there also. So, it is impossible to think of any other molecule that could
Living Beings or Living Organisms: Living organisms are those which possess the characteristic of life and are essentially made up of a life-giving substance called Protoplasm which forms cells and tissues of one kind or the other. Example- plants and animals are living beings. Important characteristics of Living Organisms: Metabolism: Living things have the ability
Cell Cycle associated with Interphase: Each cell capable of division passes through a sequence of events called the cell cycle. The cell cycle of a somatic cell usually consists of long interphase followed by a short mitotic or M-phase. The biochemical analysis of interphase nucleus has revealed that interphase is the most active stage in
Development of Seed Habit: The development of seed habit starts from the gymnosperms. The seeds are dispersed by wind. Then onwards the plants do not depend upon water for fertilization. The embryo with food reserves in the dry seed is, therefore, a tiny plant in a dormant or inactive state protected by a seed coat.
