11/7/2023 0 Comments Life processes![]() What is common for Cuscuta, ticks and leeches?Īll are parasites. In which forms do most plants absorb nitrogen? What is the internal (cellular) energy reserve in autotrophs? Oxygen liberated during photosynthesis comes from water. Where does the oxygen come from when it is liberated during photosynthesis? Where is pyruvic acid converted into lactic acid during deficiency of oxygen in tissues of human beings? This is due to the conversion of pyruvate to lactic acid in the absence of oxygen. Why does lack of oxygen in muscles often lead to cramps among cricketers? Wich is the first enzyme to mix with food in the digestive system? Valves in heart prevent backflow of blood inside the heart during contraction. What prevents backflow of blood inside the heart during contraction? Name two organisms in which food material is broken down outside the body and absorbed. Which part of root is involved in the exchange of respiratory gases in plants? Answer: Root hairs are involved in the exchange of respiratory gases in plants. Tracheal walls do not collapse when there is less air in it because it is supported by rings of cartilage. ![]() Why do the walls of trachea not collapse when there is less air in it? (ii) Carboxyhaemoglobin and as carbonic acid (CO 2 dissolved in blood plasma). Osmoregulation is the maintenance of optimum concentration of water and salts in the body fluids. Urea is removed/eliminated from the body through urine. The major nitrogenous waste product in human beings is urea. Which is the major nitrogenous waste product in human beings? How is it removed from the body? It is muscular tube through which the collected urine passes into the urinary bladder. The release of water vapours in the atmosphere through the pores present on plant leaves, i.e., stomata, is called transpiration. What process in plants is known as transpiration? In the outer part i.e., cortex of kidney. In which region of kidney Malpighian corpuscles are found? In which part of nephron is water reabsorbed? Kidneys excrete water and dissolve metabolic wastes, e.g., urea and other dissolved solids like uric acid, creatinine and inorganic salts. What is the main function of kidneys in humans? In the absence of platelets, the process of clotting will be affected. What will happen if platelets were absent in the blood? ![]() Deoxygenated blood: It is found in right auricle and right ventricle. Oxygenated blood: It is found in left auricle and left ventricle. In which chamber of heart is oxygenated and deoxygenated blood found? ![]() If xylem is removed, upward movement of water will stop leading to wilting of leaves and ultimately causes death of a plant. The xylem tissue transports water and minerals from the soil to the leaves of a plant for photosynthesis. What will happen to a plant if its xylem is removed? Water absorbed by root hairs moves through epidermis root cortex -endodermis → root xylem (i.e., tracheids and vessels) → stem xylem + xylem in the leaf. Name the various cells through which water moves upward to react the leaves. Give an example of an organism whose digestion is intracellular. Which is the largest gland in the human body? This movement pushes the food in forward direction in the alimentary canal. The contraction and expansion movements of the walls of food pipe are called peristaltic movements. It takes place in grana of chloroplast.Ī chemical reaction, which can take place even in the absence of light, is called a dark reaction or light independent reaction. The phenomenon of breaking down of water molecule using solar energy absorbed by chlorophyll molecules is known as photolysis.Ī chemical reaction, which take place only in the presence of light, is called light reaction or light dependent reaction. The factors which affect the rate of photosynthesis are light, water, temperature and carbon dioxide. Name the various factors which affect the rate of photosynthesis. Chlorophyll is present in cell organelles called chloroplasts. Solar energy is converted into chemical energy during photosynthesis.Ĭhlorophyll is a green coloured pigment found in the green leaves or green parts of the plant which traps solar energy for photosynthesis. Give the energy transformation that takes place in the process of photo synthesis.
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