They produce antibodies against antigens, and antitoxins against toxins. Answer: Question 1. Answer: Question 11. Its main function is to transport the respiratory gases like oxygen due to increased affinity towards oxygen. Peptic ulcer is caused by the high acidity of gastric juice secretions. Nitrates and nitrites. The valve separating left atrium from left ventricle is called left atrio-ventricular valve or mitral valve, formed of two flaps. Explain in brief with example. Enzymes require an optimum temperature and pH for their action. Question 3. Question 9. Give reason. What is transpiration pull? MULTICELLULAR Multicellular Made up of many number of cells Cells have a similar basic structure and similar basic life activities Different shapes and aggregated to form different tissues Tissues form organs and organs give rise to organ system that perform special function. A chemical reaction, which take place only in the presence of light, is called light reaction or light dependent reaction. Answer: The rate of liberation of O2 during photosynthesis is equal to the rate of liberation of CO2 during respiration. Following factors are there to influence the process of transpiration. What will happen to a plant if its xylem is removed? This type of respiration occurs in microscopic organisms like yeast, etc. The basic mechanism of enzyme action is to catalyze the chemical reactions, which begins with the binding of the substrate with the active site of the enzyme. (v) Egestion: The undigested food enters into the large intestine’s wider part, where water is absorbed from the undigested food and the food becomes solid. Describe internal structure of a human heart. Thus, transportation of sap from roots to the leaves at the top is called ascent of sap. Answer: Answer: Question 2. What is ascent of sap? Listed below is the classification of enzymes discussed in detail: These catalyze oxidation and reduction reactions, e.g. The human body is composed of different types of cells, tissues and other complex organs. Answer: Mechanism of breathing: Chlorophyll is present in cell organelles called chloroplasts. The gut of a starfish occupies most of the disc and extends into the arms. Tamilnadu Board Class 10 English Solutions, Tamilnadu Board Class 9 Science Solutions, Tamilnadu Board Class 9 Social Science Solutions, Tamilnadu Board Class 9 English Solutions, Memories of Childhood Class 12 MCQ Questions with Answers English Chapter 8, Control and Coordination Class 10 Extra Questions with Answers Science Chapter 7. Answer: Answer: Question 7. During this respiration glucose is broken down into ethyl alcohol and CO2 with the release of very small amount of energy. Question 26. Answer: Question 1. Transpiration: Water loss from the aerial parts of the plant is called transpiration. Though what conduction of water in plants takes place? This movement pushes the food in forward direction in the alimentary canal. This is because even when an organism is asleep, various biological processes keep on occurring in its body which requires energy. This substrate binding site is called the active site of an enzyme (E). Explain the mechanism of gaseous exchange between tissues and blood. As a result they requires less energy. Which is the major nitrogenous waste product in human beings? It is called inanimate part of blood because it lacks blood corpuscles. B → Guard cell. In four chambered heart, left half is completely separated from right half by septa. Answer: Leaves have tiny opening on their lower surface called stomata. “All plants give out oxygen during day and carbon dioxide during night”. Answer: (iv) Assimilation: The blood carries the digested and dissolved food to all parts of the body, where it is assimilated into the cells which is used for obtaining energy as well as for growth and repair of the body. Catalysts are proteins that increase the rate of chemical … Oxygen liberated during photosynthesis comes from water. Example: phosphoglucomutase catalyzes the conversion of glucose-1-phosphate to glucose-6-phosphate (phosphate group is transferred from one to another position in the same compound) in glycogenolysis (glycogen is converted to glucose for energy to be released quickly).
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