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Class 10 Biology All Chapters Most Important Questions  What is biology? Biology is the scientific study of living organisms, their interactions with each other, and their environment Why we should study biology? Studying biology is crucial for understanding ourselves, the world around us, and for addressing global challenges. It provides knowledge about the human body, the environment, and the interconnectedness of living things, ultimately leading to improvements in health, conservation, and sustainable practices.  1. Understanding Our Bodies and Health: Biology helps us understand how our bodies function, including the roles of various organs, systems, and processes like metabolism and reproduction.  It provides knowledge about nutrition, diseases, and the importance of a healthy lifestyle, empowering individuals to make informed health choices.  Medical biology plays a vital role in understanding disease mechanisms and developing treatments, including vaccines, m...

Class 10 Biology Chapter 5 - Our environment Important Questions Most important questions:- Question 1. Why is the maximum concentration of pesticides found in human beings? Answer: The pesticides are not biodegradable, they get accumulated progressively at each trophic level. As human beings occupy the topmost level in food chain, their concentration becomes maximum in our bodies. Question 2. Give one method which could be applied to reduce our intake of pesticides through food to some extent. Answer: By using biological methods for controlling insects in fields and by washing fruits and vegetables before eating could help to reduce our intake of pesticides through food to some extent. Question 3. Various steps in a food chain represent: (a) food web (b) trophic level (c) ecosystem (d) biomagnification. Answer: (b) trophic level Question 4. What is an ecosystem?  Answer: An ecosystem is defined as a structural and functional unit of the biosphere. It comprises of living organisms ...

 Class 10 Biology Chapter 4 - Heredity Important Questions  Most Important Questions:- Question 1. “Only variations that confer an advantage to an individual organism will survive in a population.” Justify this statement.  Answer: Variations are the structural, functional or behavioural changes from the normal characters developed in the living organisms. Inheritable variations participate in evolution. According to Darwin, natural selection sorts out individuals with favourable variations. Such organism will survive, reproduce more and thus, will leave more progenies. Hence, useful variations get established in nature. Question 2. Assertion (A) : The sex of a child in human beings will be determined by the type of chromosome he/she inherits from the father. Reason (R) : A child who inherits ‘X’ chromosome from his father would be a girl (XX), while a child who inherits a ‘Y’ chromosome from the father would be a boy (XY). (a) Both (A) and (R) are true and (R) is the corr...

Class 10 Biology Chapter 3 - How do Organisms Reproduce Important Questions  Most Important Questions:-  Question 1. Newly formed DNA copies may not be identical at times. Give one reason.  Answer: When a cell reproduces, DNA replication occurs which results in formation of two similar copies of DNA. The process of copying the DNA leads to some variations each time. As a result, the DNA copies produced are similar to each other but sometimes may not identical. Question 2  When a cell reproduces, what happens to its DNA?  Answer: When a cell reproduces, DNA replication occurs which forms two similar copies of DNA.. Question 3. How do Plasmodium and Leishmania reproduce? Write one difference in their mode of reproduction.  Answer: Plasmodium and Leishmania reproduce by the process of fission which is an asexual mode of reproduction. Plasmodium reproduces by multiple fission. About 1000 daughter cells are produced by the multiple fission of a Plasmodium. Leish...

Class 10 Biology Chapter 2 - Control and Coordination Most Important Questions :-   Question 1. Which is the largest and most prominent part of the brain?  Answer: Cerebrum is the largest and most prominent part of the brain. Question 2 Write the main functions of the following : (a) sensory neuron (b) cranium (c) vertebral column (d) motor neuron.  Answer: (a) Sensory neuron occur in sense organs and receive stimuli through their dendrites. The sensory neurons transmit impulses towards the central nervous system (brain and spinal cord) with the help of their axons. (b) Cranium : The bones of cranium or brain box protect the brain from mechanical injury. (c) Vertebral column : Major function of the vertebral column is protection of the spinal cord and carries the weight of the upper body. (d) Motor neuron: The dendrites of these neurons synapse with axons of interneurons in central nervous system. They transmit impulses from central nervous system towards effectors (muscl...

  Class 10 Biology Chapter 1 - Life Process  Most Important Questions  Question 1. Most of the digestion and absorption of the food takes place in the (a) small intestine (b) liver (c) stomach (d) large intestine.  Answer: (a) small intestine Question 2. Mention the raw materials required for photosynthesis. (Board Term I, 2016) Answer: Raw materials required for photosynthesis are carbon dioxide (CO2), water, light and chloroplast. Question 3. State the location and function of gastric glands.  Answer: Gastrifc glands are present in the wall of the stomach. They secrete gastric juices containing mucus, protein digesting enzymes pepsin, rennin and hydrochloric acid . Question 4. Name the glands present in the wall of the stomach that release secretions for digestion of food. Write the three components of secretion that are released by these glands.  Answer: Stomach’s muscular wall contains gastric glands. These glands secrete gastric juices which contain di...

 Class 10 - Carbon and Its Compounds  Most Important Questions :-  Q1. Why carbon cannot gain or lose four electrons ?  Answer :-  Carbon cannot gain four electrons because when it gain four electrons then 10 electrons over 6 protons will make the element unstable and therefore it cannot gain four electrons. Carbon cannot lose four electrons because to lose four electrons large amount of energy is required which is not possible , therefore, losing four electrons is not possible for Carbon  Q2. What are covalent compounds? Why are they different from ionic compounds? List their three characteristic properties.  Answer: Covalent compounds are those compounds which are formed by sharing of valence electrons between the atoms e.g., hydrogen molecule is formed by mutual sharing of electrons between two hydrogen atoms. They are different from ionic compounds as ionic compounds are formed by the complete transfer of electrons from one atom to another e.g., N...

  Class 10 - Metals and Non metals Most important questions:-  Q 1 .Write the 5 properties of metals with examples. Answer :-  • Metals are lustrous.  E.g - Silver • Metals are Good Conductor of heat . E.g - Silver and copper. • Metals are Ductile . E.g - Gold  • Metals are malleable. E.g - Gold and Silver  • Metals are Hard . E.g - chromium  Q2 . Which of the Following non metal is Lustrous :-  a) Carbon  b) Iodine  c) Chlorine d) Graphite Answer - b) Iodine Q3. Which metal remains in liquid form at room temperature ?  Answer - Mercury Q4. Which Non metal is best conductor of electricity?  Answer - Graphite  Q5 .Which Non metal is best conductor of heat ?  Answer - Diamond  Q6. Generally, when metals are treated with mineral acids, hydrogen gas is liberated, but when metals (except Mn and Mg) are treated with HNO3, hydrogen is not liberated. Why? Answer: Most metals do not react with HNO3 because nitric acid is ...

 Class 10 - Acids and Bases  Most Important Questions:-  Q1. What will be the action of the following substances on litmus paper? a) Dry HCI gas b) Moistened NH3 gas c) Lemon juice d) Carbonated soft drinks e) Curd f ) Soap solution Answer: a) Dry HCI gas: Dry HCl gas would not affect the litmus paper. b) Moistened NH3 gas: Moistened NH3 gas is alkaline in nature. Thus it will turn red litmus blue. c) Lemon juice: Lemon juice is acidic in nature. Thus it will turn blue litmus red. d) Carbonated soft drinks: Carbonated soft drinks contains carbonic acid. Thus it will turn blue litmus red. e ) Curd: Curd contains lactic acid. Thus it will turn blue litmus red. f)Soap solution: Soap is a salt of a strong base. Thus it will turn red litmus blue. Q2. What are acids and Bases ? Explain with example . Answer :-  Acids :- Acids are those which produce H+  Ions in aqueous sulutions and are sour in taste . E.g - HCL , HNO3 , HCO3 etc. Base :- Base are those which produc...