What is the function of digestive
[question] Question. What is the function of digestive enzymes ? [/question] [solution] solution: Digestive enzymes are hydrolytic enzymes which bring about hydrolytic splitting of complex organic substances into simple, soluble and absorbable substances, e.g., Protein $\stackrel{\text { enzyme }}{\longrightarrow}$ Peptides $\stackrel{\text { enzyme }}{\longrightarrow}$ Amino acids. [/solution]...
Read More →What would happen if the plasma
[question] Question. What would happen if the plasma membrane ruptures or breaks down ? [/question] [solution] Solution: There will be spilling of cytoplasm and cell organelles, bursting of lysosomes and digestion of cellular contents. [/solution]...
Read More →What is the role of acid
[question] Question. What is the role of acid in our stomach ? [/question] [solution] solution: Hydrochloric acid (HCl) is component of gastric juice. It has five functions, (i) Softening of food, (ii) Conversion of pepsinogen and prorennin into active forms of pepsin and rennin (iii) Acidify the food for proper action of pepsin. (iv) Killing of microoganisms present in food. (v) Stoppage of action of salivary amylase. [/solution]...
Read More →How is a prokaryotic cell different from a eukaryotic cell?
[question] Question. How is a prokaryotic cell different from a eukaryotic cell? [/question] [solution] Solution: [/solution]...
Read More →Why is the Prime Minister in India not directly elected by the people?
[question] Question. Why is the Prime Minister in India not directly elected by the people? Choose the most appropriate answer and give reasons for your choice. (a) In a Parliamentary democracy only the leader of the majority party in the Lok Sabha can become the Prime Minister. (b) Lok Sabha can remove the Prime Minister and the Council of Ministers even before the expiry of their term. (c) Since the Prime Minister is appointed by the President there is no need for it. (d) Direct election of th...
Read More →Where does the plants get each of the
[question] Question. Where does the plants get each of the raw materials for photosynthesis ? [/question] [solution] solution: (i) Carbon Dioxide - Air through stomata. (ii) Water - Soil through roots. (iii) Minerals - Soil through roots [/solution]...
Read More →What are the difference between autotrophic
[question] Question. What are the difference between autotrophic nutrition and heterotrophic nutrition ? [solution] solution: Autotrophic nutrition : The process through which organisms are able to build up their own organic food from raw materials which are obtained from outside, in the form of carbon dioxide and water in the presence of chlorophyll and sunlight. The organisms having autotrophic mode of nutrition or can make their own food are called autotrophs or autotrophic organisms. e.g. Gr...
Read More →Of all the institutions that we have studied in this chapter,
[question] Question. Of all the institutions that we have studied in this chapter, name the one that exercises the powers on each of the following matters. (a) Decision on allocation of money for developing infrastructure like roads, irrigation etc. and different welfare activities for the citizens. (b) Considers the recommendation of a Committee on a law to regulate the stock exchange. (c) Decides on a legal dispute between two state governments. (d) Implements the decision to provide relief fo...
Read More →What processes would you consider
[question] Question. What processes would you consider essential for maintaining life ? [/question] [solution] solution: Life processes nutrition, metabolism, respiration, exchange of materials, transportation, excretion and awareness. [/solution]...
Read More →Make a comparison and write down ways
[question] Question. Make a comparison and write down ways in which plant cells are different from animalcells. [/question] [solution] Solution: [/solution]...
Read More →Form the pair of linear equations in the following problems, and find their solutions graphi cally
[question] Question. Form the pair of linear equations in the following problems, and find their solutions graphi cally (i) 10 students of class X took part in a Mathematics quiz. If the number of girls is 4 more than the number of boys, find the number of boys and girls who took part in the quiz. (ii) 5 pencils and 7 pens together cost ` 50, whereas 7 pencils and 5 pens together cost 46. Find the cost of one pencil and that of one pen. [solution] Solution: (i) Let the number of boys be x and th...
Read More →What are outside raw materials
[question] Question. What are outside raw materials used by an organism ? [/question] [solution] solution: Food by heterotrophic organisms ; carbon dioxide, minerals and water by autotrophic organisms ; oxygen by all aerobic organisms. [/solution]...
Read More →What criteria do we use to decide
[question] Question. What criteria do we use to decide whether something is alive ? [/question] [solution] solution: The major criterion which is used to decide whether something is alive is movements. Movements may be that of locomotion (e.g. running of dog), movement of a part (e.g. chewing cud by cow), breathing movements, growth movements (in plants) and movement of molecules in metabolic reactions, maintenance and repair of cellular structures. Besides movements, other criteria found in liv...
Read More →Match the ministry with the news that the ministry may have released:
[question] Question. Match the ministry with the news that the ministry may have released: [/question] [solution] Solution: [/solution]...
Read More →Where are proteins synthesized inside the cell ?
[question] Question. Where are proteins synthesized inside the cell ? [/question] [solution] Solution: Ribosome in the Cytoplasm, Rough endoplasmic reticulum. [/solution]...
Read More →Why is diffusion insufficient to meet the oxygen requirements
[question] Question. Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans? [/question] [solution] solution: Every living cell requires oxygen for performing cellular respiration. In unicellular organisms (e.g., Amoeba), the single cell is in direct contact with environment. Oxygen passes into it through diffusion. In simple multicellular organisms (e.g. Hydra), every cell may also take oxygen through diffusion from environment. This is not possibl...
Read More →If you are elected as the President of India which
[question] Question. If you are elected as the President of India which of the following decisions can you take on your own? (a) Select the person you like as Prime Minister. (b) Dismiss a Prime Minister who has a majority in Lok Sabha. (c) Ask for reconsideration of a bill passed by both the Houses. (d) Nominate the leaders of your choice to the Council of Ministers. [/question] [solution] Solution: (c) Ask for reconsideration of a bill passed by both the houses. [/solution]...
Read More →Why are lysosomes known as suicidal bags ?
[question] Question. Why are lysosomes known as suicidal bags ? [/question] [solution] Solution: At the time of cellular damage, the lysosomes burst to release its enzyme and they digest its own cell. Therefore, lysosomes are also known as suicidal bags of a cell. [/solution]...
Read More →Compare and contrast the arrangement of elements
[question] Question. Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table. [/question] [solution] solution: [/solution]...
Read More →If the organisation of a cell is destroyed due to some physical
[question] Question. If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen? [/question] [solution] Solution: Lysosomes will burst to release digestive enzymes. Digestive enzymes cause break down of various cellular component causing destruction of the cell. [/solution]...
Read More →Which of the following institutions can make changes to an existing law of the country?
[question] Question. Which of the following institutions can make changes to an existing law of the country? (a) The Supreme Court (b) The President (c) The Prime Minister (d) The Parliament [/question] [solution] Solution: (b) The President [/solution]...
Read More →In the Modern Periodic Table,
[question] Question. In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium? [/question] [solution] solution: The elements with atomic number 12 and 38 have same chemical properties as that of calcium. This is because both of them have same number of valence electrons (2) as calcium. Since elements with same number of valence electron have similar properties...
Read More →Can you name the two organelles we have studied
[question] Question. Can you name the two organelles we have studied that contain their own genetic material? [/question] [solution] Solution: Mitochondria, chloroplast - are two orgonelles that contain there own gentc material. [/solution]...
Read More →Which of the following statements about the judiciary is false?
[question] Question. Which of the following statements about the judiciary is false? (a) Every law passed by the Parliament needs approval of the Supreme Court. (b) Judiciary can strike down a law if it goes against the spirit of the Constitution. (c) Judiciary is independent of the Executive. (d) Any citizen can approach the courts if her rights are violated [/question] [solution] Solution: (a) Every law passed by the Parliament needs approval of the Supreme Court. [/solution]...
Read More →Who among the following is a part of the political executive?
[question] Question. Who among the following is a part of the political executive? (a) District Collector (b) Secretary of the Ministry of Home Affairs (c) Home Minister (d) Director General of Police [/question] [solution] Solution: (c) Home Minister [/solution]...
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