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 Class X Chapter 6 – Life Processes Science Question 1: Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans? Answer Multicellular organisms such as humans possess complex body designs. They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion cannot meet their oxygen requirements. Question 2: What criteria do we use to decide whether something is alive? Answer Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye. Therefore, the presence of life processes is a fundamental criterion that can be used to decide whether something is alive or not. Question 3: What are o...

What is yeast? A substance used for making bread rises and for making beer, wine etc.  Types of yeast - i) Baker's yeast ii) Nutritional yeast iii) Brewer's yeast iv) Distiller's yeast ➡️Twenty million yeast = 1gm yeast powder ➡️It is also known as suger eating fungus.  ➡️It's scientific name is Saccharomy Cerevisiae. ➡️It is also known as - catalyst, fungus, rising, agent, fermenter, leavening. What is fermentation?  Fermentation is a process in which a substance breaks down into a simpler substance.  ➡️Macroorganisms like yeast and bacteria usually play a role in the fermentation process, creating beer, wine, bread, and other food. What is catalyst (उत्प्रेरक)?  A substance which changes the rate of a reaction without itself undergoing (के दौर से गुजरना ) any permanent chemical change.  ➡️Types of Heterotrophic Nutrition i) saprotrophic nutrition ii) parasitic nutrition iii) holozonic nutrition What is saprotrophic or saprophytic nutrition?  In this ...

  Gender Test- 20 marks Date-........................ Q. No.(01) Direction : Look at the words and answer the questions given below - [ This, That, she, Me, You, What, Our, His, Us, Who, They, he, Yourself, I, It, Her, Them, Her, Everybody, Each, Him, Either, Anyone, Both, Nothing, which, itself. ] 1) Pick out the pronouns of masculine gender from the box. 2) Pick out the pronouns of feminine gender from the box. 3) Pick out the pronouns of common gender from the box. 4) Pick out the pronouns used for all genders from the box. Q No.( 02) Define it with suitable examples :- a) Neuter Gender b) Common Gender c) feminine Gender Q No. (03) Direction : Look at the box and answer the questions given below - [teacher, ciw, bitch, doctor, king, stone, driver, queen, widow, dog, enemy, hen, hostess, tea, poet, friend, prince, princess, master, mistress, jew, goddess, tigress, auther, lioness, landlord, class, she-goat, chairman, honesty, child, stepson, thief, mother, studen...