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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 119751. |
Select the correct statement from the ones given belowA. Morphine is often given to a person who have undergone surgery as a pain killerB. Chewing tabacco lowers blood pressure and heart rateC. Cocaine is given to patients after surgery as it stimulates recoveryD. Barbiturates when given to criminals make them tell the truth |
| Answer» Correct Answer - A | |
| 119752. |
Every time when the dosage of drug has to be increased to achieve the same kick, that initially occurred in response to a smaller dose, the condition is known asA. AddictionB. ToleranceC. Withdrawal symptomD. Rebound effect |
| Answer» Correct Answer - B | |
| 119753. |
Which one of the following is used to treat urinary tract infection and respiratory infections? (a) doxycycline (b) karamycin (c) ciprolloxacin (d) ibuprofen |
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Answer» (c) ciprolloxacin |
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| 119754. |
Which of the following is used to treat respiratory tract infections, genital, gastrointestinal tract and skin infections? (a) ampicillin (b) penicillin (c) terfenadine (d) azithromycin |
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Answer» (d) azithromycin |
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| 119755. |
Which enzyme is required in the process of transcription?(A) DNA Polymerase-I(B) DNA Polymerase-Ill(C) Helicase(D) RNA Polymerase |
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Answer» (D) RNA Polymerase |
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| 119756. |
Which enzyme is required in the process of transcription? (A) DNA Polymerase-I (B) DNA Polymerase-Ill (C) Helicase(D) RNA Polymerase |
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Answer» Correct Answer is: (D) RNA Polymerase The main enzyme involved in transcription is RNA polymerase, which uses a single-stranded DNA template to synthesize a complementary strand of RNA. |
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| 119757. |
Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.d. 4Be, 6C, 8O, 5B, 13Al Which is the most electropositive element among these? |
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Answer»
Among these, 13Al is the most electropositive element. |
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| 119758. |
(a) Electropositive nature of the element(s) increases down the group and decreases across the period (b) Electronegativity of the element decreases down the group and increases across the period (c) Atomic size increases down the group and decreases across a period (left to right) (d) Metallic character increases down the group and decreases across a period.On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9. (a) Name the most electropositive element among them (b) Name the most electronegative element (c) Name the element with the smallest atomic size (d) Name the element which is a metalloid (e) Name the element which shows maximum valency |
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Answer» (a) Electropositive nature of the element(s) increases down the group and decreases across the period. (b) Electronegativity of the element decreases down the group and increases across the period (c) Atomic size increases down the group and decreases across a period (left to right) (d) Metallic character increases down the group and decreases across a period.
e) Carbon is the element which shows maximum valency. |
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| 119759. |
Differentiate between the chemical nature of an aqueous solution of HCI and an aqueous solution of NH3. |
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Answer» Aqueous solution of HCI and an Aqueous solution of NH3
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| 119760. |
Write next two members of the homologous series: C2H6, C3H8. |
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Answer» C4H10 , C5H12 |
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| 119761. |
Mendeleev′ s predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. (a) Name the elements which have taken the place of these elements (b) Mention the group and the period of these elements in the Modern Periodic Table. (c) Classify these elements as metals, non-metals or metalloids (d) How many valence electrons are present in each one of them? |
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Answer» (a) Germanium (Ge) and Gallium (Ga) (b) Group 14; Period 4 and Group 13; Period 4 (c) Ge — Metalloid; Ga — Metal (d) Ga — 3 ,Ge —4 |
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| 119762. |
Which of the following two organic compounds belong to the same homologous series? C2H6, C2H6O, C2H6O2, CH4O |
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Answer» CH4O, C2H6O belong to the same homologous series as they differ only by a –CH2 unit. |
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| 119763. |
The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here are not the chemical symbols of the elements):a3b4c5d6e7f8g9h10i11j12k13l14m15n16o17p18(i) Which element has a bigger atom, a or ƒ ?(ii)Which element has a higher valency, k or o?(iii) Which element is more metallic, i or k?(iv) Which element is more non-metallic, d or g?(v) Select a letter which represents a metal of valency 2.(vi) Select a letter which represents a non-metal of valency 2. |
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Answer» (i) a (size decreases from left to right in a period) . (ii) k (valency of k = 3; valency of o = 1). (iii) i (metallic character decreases from left to right in a period). (iv) g (non-metallic character increases from left to right in a period) . (v) b (or j) . (vi) f (or n) . |
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| 119764. |
Give the IUPAC name of the following compound :C2H6 |
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Answer» The IUPAC name of the following compound is- Ethane. |
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| 119765. |
Compare the radii of two species X and Y. Give reasons for your answer.(a) X has 12 protons and 12 electrons(b) Y has 12 protons and 10 electrons |
| Answer» Radii of Y is less than X because Y is cation of X. | |
| 119766. |
What is an alkyl group? |
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Answer» If one hydrogen is removed from an alkane, it is called alkyl group. Ex : CH4 → methane CH3 → methyl group |
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| 119767. |
Compare the radii of two species X and Y. Give reasons for your answer. (a) X has 12 protons and 12 electrons(b) Y has 12 protons and 10 electrons |
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Answer» Radii of Y is less than X because Y is cation of X |
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| 119768. |
Element M is in the first group of the periodic table. Write the formula of its oxide. |
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Answer» First group of the periodic table is mainly known as alkali metals and they have valency = 1 and oxide with the valency = 2 so the formula of oxide would be M2O. |
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| 119769. |
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride? |
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| 119770. |
An element X is in group 2 of the periodic table :(a) What will be the formula of its chloride ?(b) What will be the formula of its oxide ? |
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Answer» Valency of X = 2 (a) XCl2 (b) XO |
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| 119771. |
Write the formulae of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev. |
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Answer» Chlorides of Eka-silicon: GeCl4 Chlorides of Eka-Aluminium: GaCl3 |
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| 119772. |
Write the formula of chlorides of Eka-silicon and Eka-aluminium, the elements predicted by Mendeleev. |
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Answer» Germanium is Eka-silicon. The formula is GeCl4. Gallium is Eka-aluminium. The formula is GaCl3. |
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| 119773. |
Write the formulae of chlorides of Eka-silicon and Eka aluminium, the elements predicted by Mendeleev. |
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Answer» GeCl4, GaCl3 |
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| 119774. |
The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on ? |
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Answer» Scandium, Gallium, Germanium. |
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| 119775. |
State and explain the reactions, if any, of the following metals with a solution of copper sulphate :(a) Gold (b) Copper (c) Zinc (d) Mercury |
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Answer» (a) No displacement reaction will take place because go ld is less reactive than copper. (b) No reaction will take place between copper and copper sulphate solution ; there is no reaction possible. (c) Zinc displaces copper from copper sulphate solution to form zinc sulphate solution and copper metal because zinc is m ore reactive than copper . (d) No displacement reaction will take place because mercury is less reactive than copper |
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| 119776. |
An element X forms two oxides XO and XO2 . The oxide XO has no action on litmus solution but oxide X0 turns litmus solution red.(a) What is the nature of oxide XO ?(b) What is the nature of oxide XO2 ?(c) Would you call element X a metal or a non-metal ? Give reason for your choice.(d) Can you give an example of element like X ? |
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Answer» (a) Neutral oxide. (b) Acidic o xide . (c) X is non-metal because non-metals form acidic and basic oxide . (d) Carbon, C . |
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| 119777. |
A black metal oxide XO is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO is also used in ordinary dry cells. The metal oxide XO cannot be reduced satisfactorily with carbon to form metal X.(a) Name the metal X.(b) Name the metal oxide XO(c) Which reducing agent can be used to reduce XO to obtain metal X ?(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent. |
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Answer» (a) Manganese (b) Manganese dioxide (c) Aluminium (d) Chromium |
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| 119778. |
What is acrylic ? Where do we use acrylic? |
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Answer» Acrylic is a synthetic fibre made from the combination of coal, air, water and lime¬stone. It looks like natural wool. If can be considered as artificial wool. It is used in knitted apparels such as fleece, socks, sportswear and sweaters. It is also used in craft yarns, upholstery fabric, carpets, luggage yawning and vehicle covers. |
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| 119779. |
List out the objects made up of Acrylic. |
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Answer» 1. It is used in knitted apparels such as fleece, socks, sports wear and sweaters. 2. It is also used in craft yarns, upholstery fabric, carpets, lugguage awnings and vehicle covers. |
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| 119780. |
Why is acrylic considered as a cheap substitute of wool? |
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Answer» Acrylic is a man-made fibre. Natural wool and the clothes (for example, sweaters) made from it are quite expensive. Acrylic is a soft lightweight fibre which appears to resemble natural wool. The cost of acrylic is low when compared to the cost of natural wool. Therefore, acrylic can be considered as a cheap substitute of wool. |
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| 119781. |
Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S ? How have you arrived at this conclusion ? |
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Answer» Metal P is zinc; Metal Q is tin; Metal R is lead; Metal S is iron. Metal P (zinc) is used to form a thin layer on metal S (iron) by the process of galvanisation to prevent its corrosion. Metal Q (tin) i s used for electroplating tiffin boxes made of metal S (iron). Metal R (lead) is used in making car batteries. Metals Q (tin) and R (lead) form an alloy called solder . |
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| 119782. |
Can a motion be periodic and not simple harmonic? If your answer is yes, give an example and if not, explain why? |
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Answer» Yes, when a ball is doped from a height on a perfectly elastic surface, the motion is oscillatory but not simple harmonic as restoring force F=mg=constant and not F α -x, which is an essential condition for S.H.M. |
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| 119783. |
The main apparatus required in the activity to observe the heat conductivity of metals A) Metal pins B) Retard stand C) Spirit lamp D) All the above |
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Answer» Correct option is D) All the above |
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| 119784. |
(a) State one use each of the following non-metals :Hydrogen, Carbon (as Graphite), Nitrogen, Sulphur(b) Name the metal which is used in making thermometers. |
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Answer» (a) (i) Hydrogen – Hydrogen is used in the hydrogenation of vegetable oils. (ii) Carbon is used to make electrodes of electrolytic cells and dry cells. (iii) Nitrogen is used in the manufacture of ammonia, nitric acid and fertilizers. (iv) Sulphur is used in making sulphuric acid. (b) Mercury |
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| 119785. |
Write the motion of different parts of a bicycle while it is in motion. |
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Answer» a) The wheel: Rotatory and Translatory motion. b) The cycle chain: Rotatory motion. c) The pedal with its arm: Rotatory. d) The movement of feet pedaling Rotatory. e) The rider along with the bicycle; Translatory. |
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| 119786. |
The non – metal which is in solid state at room temperature A) Carbon B) Chlorine C) Bromine D) Iodine |
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Answer» Correct option is A) Carbon |
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| 119787. |
The non-metal used in fire works A) Chlorine B) Iodine C) Sulphur D) Oxygen |
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Answer» Correct option is C) Sulphur |
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| 119788. |
State one use each of the following metals :Copper, Aluminium, Iron, Silver, Gold, Mercury |
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Answer» (i) Copper – Copper is used to make wires to carry electric current. (ii) Aluminium – Aluminium foils are used in packaging of food materials. (iii) Iron – Iron is used to make utensils. (iv) Silver – Silver is used to make jewellery. (v) Gold – Gold is used to make jewellery. (vi) Mercury – Mercury is used in thermometers. |
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| 119789. |
The non-metal used in matchsticks is A) Chlorine B) Sulphur C) IodineD) Oxygen |
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Answer» Correct option is B) Sulphur |
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| 119790. |
Write the motion of different parts of a bicycle while it is in motion, a) the wheels b) the cycle chains c) the pedal with its arm d) the movement of the rider along with the bicycle. |
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| 119791. |
State five uses of metals and five of non-metals. |
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Answer» Uses of metals: (i) Lead metal is used in making car batteries. (ii) Zinc is used for galvanizing iron to protect it from rusting. (iii) Iron, copper and aluminium are used to make utensils. (iv) Copper and aluminium metals are used to make electrical wires. (v) Aluminium is used to make aluminium foil for packaging materials. Uses of non-metals: (i) Hydrogen is used in the hydrogenation of vegetable oils. (ii) Carbon is used to make electrodes of electrolytic cells and dry cells. (iii) Nitrogen is used in the manufacture of ammonia, nitric acid and fertilizers. (iv) Sulphur is used for producing sulphuric acid. (v) Liquid hydrogen is used as rocket fuel. |
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| 119792. |
What are the uses of metals? |
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Answer» Uses of metals: 1. Gold, silver, copper are used in making jewellery. 2. Silver foil is used in decoration of sweets. 3. Aluminium foil is used in inner packing of food materials and toffees. 4. Aluminium and copper mixture is used in currency coins, medals and statues. 5. Zinc and iron mixture is used in making of iron sheet. 6. Most of agricultural instruments are made by iron. 7. Electrical appliances, automobiles, satellites, aeroplanes, cooking utensils, machinery decorative materials are made by metals. |
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| 119793. |
Write the uses of chlorine? |
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| 119794. |
Explain the uses of oxygen |
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| 119795. |
Have you notice that the lustre of metals like aluminium and ion fades gradually. Give reason? |
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Answer» The reason for this is the formation of oxide of these metals when they combine with oxygen |
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| 119796. |
The words in the box are all words that describe movement. Use them to fill in the blanks in the sentences below.Dived, gliding, sprang, darting, whipped, back, delving1. When he began to trust me, the squirrel began ————— into my pockets for morsels of cake.2. I saw a cobra ————— out of a clump of cactus.3. The snake hissed, his forked tongue ————— in and out.4. When the cobra tried to bite it, the mongoose ——————— aside.5. The snake —————— his head —————— to strike at the crow.6. The birds —————— at the snake. |
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Answer» 1.delving 2.gliding 3.darting 4.sprang 5.whipped, back 6. dived |
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| 119797. |
1. The word ‘round’ usually means a kind of shape. What is its meaning in the story?2. Find five words in the following paragraph, which are generally associated with trees. But here, they have been used differently. Underline the words. Hari leaves for work at nine every morning. He works in the local branch of the firm of which his uncle is the owner. Hari’s success is really the fruit of his own labour. He is happy, but he has a small problem. The root cause of his problem is a stray dog near his office. The dog welcomes Hari with a loud bark every day. |
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Answer» 1. The word 'round' in the story means the different phases of the fight between the cobra and the mongoose. 2.Leaves, branch, fruit, root and bark. |
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| 119798. |
The old banyan tree “did not belong” to Grandfather, but only to the boy, because ______.2. The small gray squirrel became friendly when __________________.3. When the boy started to bring him pieces of cake and biscuit, the squirrel ____________.4. In the spring, the banyan tree ___________ and __________ would come there.5. The banyan tree served the boy as a ______________.6. The young boy spent his afternoons in the tree _____________. |
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Answer» 1.he found that the boy did not arm himself with catapult or air-gun. 2.he found that the boy did not arm himself with catapult or air-gun. 3.grew quite bold and was soon taking morsels from the author's hand. 4.was full of small red figs, birds of all kinds 5.library. 6.when it was not too hot |
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| 119799. |
What happened when the banyan tree cried loudly? |
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Answer» When the banyan tree cried loudly, his voice was heard by the wild animals and they rushed towards it. |
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| 119800. |
What advice did the banyan tree give to the mango tree? |
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Answer» The banyan tree advised that the mango tree should’t be that rude because trees and animals must live in harmony and help each other. |
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