Sujeet Kumar

Question 1.Rewrite the following statements using correct of the options and explain the completed statements.(gluconic acid, coagulation, amino acid, 4% acetic acid, clostridium, lactobacilli) a. Process of ……. of milk proteins occurs due to lactic acid.Answer:Process of Coagulation of milk proteins occurs due to lactic acid.Explanation: The lactobacilli are the bacteria carrying out fermentation of … Read more

Question 1.a. I am diploblastic and acoelomate. Which phylum do I belong to ?Answer:I am from phylum Cnidaria or Coelenterata. b. My body is radially symmetrical. Water vascular system is present in my body. I am referred as fish though I am not. What is my name?Answer:Starfish. I am from Echinodermata phylum. c. I live … Read more

Question 1.Remake the table taking into account relation between entries in three columns. I II III Coal Potential energy Wind electricity plant Uranium Kinetic energy Hydroelectric plant Water reservoir Nuclear energy Thermal plant Wind Thermal energy Nuclear power plant Answer: I II III Coal Thermal energy Thermal plant Uranium Nuclear energy Nuclear power plant Water … Read more

Question 1.Reorganize the following food chain. Describe the ecosystem to which it belongs.Grasshopper – Snake – Paddy field – Eagle – Frog.Answer: Question 2.Explain the statement – ‘We have got this Earth planet on lease from our future generations and not as an ancestral property from our ancestors.’Answer: Question 3.Write short notes.a. Environmental conservation.Answer:Due to … Read more

Question 1.Complete the following chart. Asexual reproduction Sexual reproduction 1. Reproduction that occurs with the help of somatic cells is called asexual reproduction. 1. ______________________________________________________________________________________ 2. ______________________________________________________________________________________ 2. Male and female parent are necessary for sexual reproduction. 3. This reproduction occurs with the help of mitosis only. 3. ______________________________________________________________________________________ 4. ______________________________________________________________________________________ 4. New individual formed … Read more

Question 1.Fill in the blanks and explain the statements.a. After complete oxidation of a glucose molecules, ……….. number of ATP molecules are formed.Answer:After complete oxidation of a glucose molecules, 38 number of ATP molecules are formed. b. At the end of glycolysis, ……………… molecules are obtained.Answer:At the end of glycolysis, pyruvate molecules are obtained. c. … Read more

Question 1.Complete the following diagram. Answer: Question 2.Read the following statements and justify same in your own words with the help of suituble examples.a. Human evolution began approximately 7 crore years ago.Answer: b. Geographical and reproductive isolation of organisms gradually leads to speciation.Answer: c. Study of fossils is an important aspect of study of evolution.Answer: … Read more

Question 1.Fill in the blanks and explain the statements with reasoning:a. If the height of the orbit of a satellite from the earth’s surface is increased, the tangential velocity of the satellite will ………………Answer:If the height of the orbit of a satellite from the earth’s surface, is increased, the tangential velocity of the satellite will decrease.Explanation: … Read more

Question 1.Match the pairs. Group A Group B a. C2H6 1. Unsaturated hydrocarbon b. C2H2 2. Molecular formula of an alcohol c. CH4O 3. Saturated hydrocarbon d. C3H6 4. Triple bond Question 2.Draw an electron dot structure of the following molecules. (Without showing the circles)a. Methane.Answer:Molecular formula: CH4 b. Ethene.Answer:Molecular formula: H2C = CH2 c. … Read more

Question 1.a. Alloy of sodium with mercury.Answer:Silver amalgam. b. Molecular formula of common ore of aluminium.Answer:Al2O3.nH2O c. The oxide that forms salt and water by reacting with both acid and base.Answer:Aluminium oxide (Al2O3). d. device used for grinding an ore.Answer:The device used for grinding an ore is grinding mill. e. The nonmetal having electrical conductivity.Answer:Graphite … Read more