chapter 2 Life Processes in Living Organisms Part -1
- How energy is formed from oxidation of carbohydrates, fats and proteins? Correct the diagram given below.
- Explain the Krebs cycle with reaction. The Krebs cycle (citric acid cycle) is the series of reactions in the mitochondria by which the acetyl group from pyruvic acid is completely... 1
- How all the life processes contribute to the growth and development of the body? All life processes work together to supply the materials and energy that cells need to divide and grow, so the body grows and develops. Nutr... 1
- With the help of suitable diagrams, explain the five stages of prophase-I of meiosis. Most of the events that function to differentiate meiosis from mitosis occur in Prophase I Homologous chromosomes form bivalents (or tetrads... 1
- With the help of suitable diagrams, explain the mitosis in detail. Mitosis is the cell division in somatic cells in which one cell divides into two daughter cells, each with the same number of chromosomes as... 1
- Explain the glycolysis in detail. Glycolysis is the breakdown of one molecule of glucose (6-carbon) into two molecules of pyruvic acid (3-carbon) in the cytoplasm, without th... 1
- Krebs cycle is also known as citric acid cycle. The Krebs cycle is called the citric acid cycle because citric acid is the first product formed in this cycle. In the mitochondria, acetyl-C... 1
- Sometimes, higher plants and animals too perform anaerobic respiration. Higher plants and animals perform anaerobic respiration when the supply of oxygen to some of their cells is not enough. Animals: during heav... 1
- Cell division is one of the important properties of cells and organisms. Cell division is an important property because growth, repair, reproduction and continuity of life all depend on it. Growth: a multicellular... 1
- Fibers are one of the important nutrients. Fibres are important nutrients because, although they are not digested, they keep the digestive system healthy. Fibres (roughage) are the in... 1
- Oxygen is necessary for complete oxidation of glucose. Oxygen is necessary because it is the final acceptor of electrons and hydrogen in the electron transfer chain; without it glucose cannot be... 1
- Distinguish between c. Aerobic and anaerobic respiration. Aerobic respiration needs oxygen and oxidises glucose completely; anaerobic respiration occurs without oxygen and oxidises it only partly. A... 1
- distinguish between b. Mitosis and meiosis. Mitosis produces two identical diploid cells for growth and repair; meiosis produces four haploid gametes with variations. MitosisMeiosis Oc... 1
- Distinguish between a. Glycolysis and TCA cycle. Glycolysis breaks glucose into pyruvic acid in the cytoplasm, while the TCA (Krebs) cycle completely oxidises acetyl-CoA to CO₂ in the mitoc... 1
- Write defination f. Glycolysis. Glycolysis: the first step of cellular respiration, in which one molecule of glucose is broken down step by step into two molecules of pyruv... 1
- Write definations e. Aerobic respiration. Aerobic respiration: cellular respiration that takes place in the presence of oxygen, in which glucose is completely oxidised to carbon diox... 1
- Write defination d. Cellular respiration Cellular respiration: the process in which food molecules (mainly glucose) are oxidised inside the cells to release energy, which is stored... 1
- Write definations c. Proteins. Proteins: large, complex molecules made of many amino acids joined by peptide bonds; they are body-building nutrients. Proteins are needed f... 1
- Write definations b) Nutrients Nutrients: the substances in food that the body uses to obtain energy, and for growth, repair and control of body functions. Main nutrients... 1
- Write definitions. a. Nutrition. Nutrition: the process of taking in food and using it to obtain energy and materials for growth, repair and maintenance of the body. It incl... 1
- Fill in the blanks and explain the statements. a. After complete oxidation of a glucose molecules, ---- --- --- number of ATP molecules are formed. a. 38; b. 2 (pyruvic acid); c. pachytene; d. metaphase; e. phospholipid; f. anaerobic a. After complete oxidation of one glucose molecule, 3... 1