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 Keywords: 1. Biodiversity: Biodiversity refers to a variety of living organisms found in a specific area. 2. Biosphere reserves: Biosphere reserves are the areas meant for conservation of biodiversity. 3. Deforestation: The cutting down of trees on a large scale is called deforestation. 4. Desertification: Soil erosion can convert the fertile land into the deserts. It is called desertification. 5. Ecosystem: An ecosystem is made of all the plants, animals and microorganisms in an area along with non-living components such as climate, soil, rivers etc. 6. Endangered species: Such species which are facing the risk of extinction are called as endangered species. 7. Extinct: Extinct means to disappear forever from earth. 8. Endemic species: Endemic species are those species of plants and animals which are found exclusively in a particular area. They are naturally found nowhere else. 9. Fauna: The animals found in a particular area are called fauna. 10. Flora: The plants found in a par...

 Q-1. What will the unit digit of the square of the following numbers? 1. 11 Solve: 1 × 1 = 1 Ans: 1 2. 272 Solve: 2 × 2 = 4 Ans: 4 3. 799 Solve: 9 × 9 = 81 Ans: 1 4. 3853 Solve: 3 × 3 = 9 Ans: 9 5. 1234 Solve: 4 × 4 = 16 Ans: 6 6. 7437 Solve: 7 × 7 = 49 Ans: 9 7. 52692 Solve: 2 × 2 = 4 Ans: 4 8. 99920 Solve: 0 × 0 = 0 Ans: 0 9. 12796 Solve: 6 × 6 = 36 Unit Digit Ans: 6 10. 55555 Solve: 5 × 5 = 25 Unit Digit Ans: 5 Q-2. The following numbers are obviously not perfect squares. Give reason. a) 1057 Ans: No, because it ends with 7. b) 23453 Ans: No, because it ends with 3. c) 7928 Ans: No, because it ends with 8. d) 222222 Ans: No, because it ends with 2. e) 6000 Ans: No, because it ends with 0. f) 89722 Ans: No, because it ends with 2. g) 222609 Ans: No, because it ends with 9. h) 505050 Ans: No, because it ends with 0. Q-3. The square of each of the following would be odd numbers: a) 431 Ans: odd number b) 2836 Ans: even number c) 7779 Ans: odd number d) 8204 Ans: even number Q-4. O...

Keywords: Biodiversity : Biodiversity refers to a variety of living organisms found in a specific area. Biosphere Reserves : Biosphere reserves are the areas meant for conservation of biodiversity. Deforestation : The cutting down of trees on a large scale is called deforestation. Desertification : Soil erosion can convert the fertile land into the deserts. It is called desertification. Ecosystem : An ecosystem is made of all the plants, animals and microorganisms in an area along with non-living components such as climate, soil, rivers etc. Endangered species : Such species which are facing the risk of extinction are called as endangered species. Extinct : Extinct means to disappear forever from earth. Endemic species : Endemic species are those species of plants and animals which are found exclusively in a particular area. They are not naturally found anywhere else. Fauna : The animals found in a particular area are called fauna. Flora : The plants foun...

 Word                 Meaning Recall                 Remember Extending         Spreading Rivalries          Hostiles Subdue                  To suppress (दबाना) Dethroned          Removed from power Misery                  Troubles Famines.         Devastation (विनाश) Starvation         To die for hunger (भुखमरी) Puppets Slave of a master (कटपुतली) To ruin To destroy Q–1: Look at picture 1 and recall the opening lines of the original song in Hindi. Who is the singer? Who else do you see in this picture? Ans: Mrs. Lata Mangeshkar is the singer. Jawahar Lal Nehru, L.B. Shastri and Smt. Indira Gandhi are also shown in this picture. Q–2: In picture 2, what do you understand by t...

 Good morning and a warm welcome to those who are present here. Today we have assembled here to talk on the topic – ‘Swachh Bharat Abhiyan’, a mission started by the government of India. Friends, each one of us present here would surely love to live in a hygienic environment. It is surely the safest and best to lead a healthy life. Friends, I am also a part of this abhiyan (campaign). A group of 20 boys and girls has been working day and night on this mission. We go door to door and create awareness among the various colonies specially in the slum areas. Besides, we have also taken up the project of making our society green. As part of this drive, we are planting saplings. I think you will also agree with this campaign and would contribute in making India clean and green. Let us take pledge to contribute in this endeavour of our government.

राम का शब्द रूप विभक्ति एकवचन द्विवचन बहुवचन प्रथमा  रामः  रामौ  रामाः द्वितीया  रामम्  रामौ  रामान् तृतीया  रामेण  रामाभ्याम्  रामैः चतुर्थी  रामाय  रामाभ्याम्  रामेभ्यः पंचमी  रामात्  रामाभ्याम्  रामेभ्यः षष्ठी  रामस्य  रामयोः  रामाणाम् सप्तमी  रामे  रामयोः  रामेषु

 Q-6. What is irrigation? Describe two methods of irrigation which conserve water. Ans: The supply of water to crops at regular intervals is called irrigation. Methods of irrigation which conserve water are: 1. Sprinkler system 2. Drip system Q-7. If wheat is sown in the kharif season, what would happen? Discuss. Ans: Wheat is a rabi crop, so it requires cold climate and less water to be grown properly. If sown in the kharif season, it will not grow or may get destroyed due to excessive rain in the kharif season. Q-8. Explain how soil gets affected by the continuous plantation of crops in a field. Ans: Soil can lose mineral nutrients to the plant which are essential for their growth. Continuous plantation of crops make the soil poor in nutrients, this makes the soil infertile. Q-9. What are weeds? How we control them? Ans: Weeds are unwanted plants that grow along with the crop. Removal of weeds is called weeding. This can be done manually by using khurpi or by spraying weedicides ...

 Q-5: Explain how fertilisers are different from manure. Ans: Different between fertilisers and manure are following: Fertiliser Manure 1) It is man-made inorganic substance. 1) It is a natural substance obtained by the decomposition. 2) It is prepared in factories. 2) It can be prepared in field. 3) It does not provide humus to soil. 3) It provides a lot of humus to soil. 4) These are rich in nutrients like nitrogen, phosphorus and potassium. 4) It is relatively less in plant n utrients.

  Q-1 Select the correct word from the following list and fill in the blanks: ( float, water, crop, nutrients, preparation ) a) The same kind of plants grown and cultivation on a large scale at a place is called crop . b) The first step before growing crops is preparation of the soil. c) Damaged seeds would float on top of water. d) For growing a crops, sufficient sunlight and water and nutrients . Q-2 Match items in Column A with those in Column B: A B 1. Kharif crops → Paddy and cotton (1) 2. Rabi crops → Wheat and gram, mustard etc. (2) 3. Chemical fertilisers → Urea and super phosphate (3) 4. Organic manure → Animal excreta, cow dung, urine and plant waste (4) Q-3 Give two examples of each: a) Rabi crop = pea, wheat, gram, mustard etc. b) Kharif crop = paddy, cotton, maize, millet etc. Q-10 Arrange the following boxes in proper order to make a flow chart of sugarcane crop production: Preparation of soil Ploughing the field Sowing Manuring ...

Keywords: Agricultural Practices – Activities involved in the cultivation of a crop are called agricultural practices. Animal Husbandry – Rearing animals with proper food, shelter and care on a large scale is called animal husbandry. Crop – Plants of the same kind cultivated at one place on a large scale are called crops. Fertiliser – Fertilisers are chemicals that are rich in particular nutrients and added to the soil for the healthy growth of crops. Granaries – Granaries are storehouses to store the grains and protect them from pests, rats and insects. Harvesting – Harvesting is the cutting of the mature crop manually or by machines. Irrigation – The supply of water to crops at appropriate intervals is called irrigation. Manure – Manure is a natural substance obtained from the decomposition of plants and animals wastes. Plough – Plough is a tool used to turn or till the soil in fields during preparation. Silos – Farmers store grain in bags or metalli c tins, this is called silos.