IIT JEE Practice Question and Answer

Q: Why is Meiosis called Reduction Division? 1685 0

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Answer :
Explanation :

Meiosis :: Meiosis is a type of cell division that reduces the chromosome number by half in daughter cells, creating four haploid cells, each genetically distinct from the parent cell that gave rise to them. Why it is called as Reduction Division :: 1. As the Meiosis division process involves in reduction of chromosome number in the daughter cells to half the number in the parent cell, this process is called Reduction Division.Meiosis creates gametes (egg and sperm cells). 2. The resulting gametes have 23 new chromosomes, one member of each of the 23 pairs, representing unique combinations of the original maternal and paternal copies.

Q: Is steel a compound? 1684 0

  • 1
    TRUE
    Correct
    Wrong
  • 2
    FALSE
    Correct
    Wrong
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Answer : 2. "FALSE"
Explanation :

Answer: B) FALSE Explanation: Steel is not a compound or element. Steel is an alloy of iron and carbon and other elements and hence it is a mixture. Because of its high tensile strength and low cost, it is a major component used in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons.

Q: What is 70 of 50? 1683 0

  • 1
    35
    Correct
    Wrong
  • 2
    38
    Correct
    Wrong
  • 3
    42
    Correct
    Wrong
  • 4
    44
    Correct
    Wrong
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Answer : 1. "35"
Explanation :

Answer: A) 35 Explanation: what is 70 of 50 means 70% of 50   ⇒70 x 50100= 7 x 5= 35   Hence, 70 of 50 is 35.

Q: Which of the following is not a plantation crop? 1683 0

  • 1
    rubber
    Correct
    Wrong
  • 2
    coffee
    Correct
    Wrong
  • 3
    gram
    Correct
    Wrong
  • 4
    coconut
    Correct
    Wrong
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Answer : 3. "gram"
Explanation :

Answer: C) gram Explanation: Gram is not a Plantation crop among the given options.   Plantation crops are known as cash crops. These crops are mostly grown at tropical and subtropical areas. These crops are grown for sale but not for local consumption. such crops include rubber, coffee, tea, various oil seeds, sugar cane,etc. So, Gram is not a plantation crop.

Q: Which of the following is Not a Greenhouse Gas? 1683 0

  • 1
    Oxygen
    Correct
    Wrong
  • 2
    Methane
    Correct
    Wrong
  • 3
    Nitrous Oxide
    Correct
    Wrong
  • 4
    Carbondioxide
    Correct
    Wrong
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Answer : 1. "Oxygen"
Explanation :

Answer: A) Oxygen Explanation: A greenhouse gas is a gas in an atmosphere that absorbs and emits radiant energy within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.    Carbon dioxide is a main greenhouse gas, found in car exhaust pipes.Methane and nitrous oxide is another type of greenhouse gas. Oxygen is the only clean gas out there because we need it to survive. Therefore, the only gas that is not a greenhouse gas is Oxygen.

Q: What molecule carries genetic information? 1683 0

  • 1
    RNA
    Correct
    Wrong
  • 2
    DNA
    Correct
    Wrong
  • 3
    Proteins
    Correct
    Wrong
  • 4
    Nucleotides
    Correct
    Wrong
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Answer : 2. "DNA"
Explanation :

Answer: B) DNA Explanation: The nucleus of a cell contains chromosomes, which carry genetic information in a long molecule called DNA. Genes are regions of DNA that carry the code to control a particular cell activity or the production of a particular protein.

Q: 100 percent of which number is 20? 1682 0

  • 1
    100
    Correct
    Wrong
  • 2
    500
    Correct
    Wrong
  • 3
    20
    Correct
    Wrong
  • 4
    0
    Correct
    Wrong
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Answer : 3. "20"
Explanation :

Answer: C) 20 Explanation: Let the rquired number be 'P' According to the question, 100 x P100 = 20=> P = 20 x 100100 = 20 Hence, 100 percent of the number 20 is 20.   Now, you can also try for 20 percent of what number is 100 20 x P100 = 100=> P = 100 x 10020 = 500=> P = 500 Hence, 20 percent of the number 500 is 100.

Q: Pollen grains in plants are produced in 1681 0

  • 1
    Flower
    Correct
    Wrong
  • 2
    Stem
    Correct
    Wrong
  • 3
    Roots
    Correct
    Wrong
  • 4
    Leaves
    Correct
    Wrong
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Answer : 1. "Flower"
Explanation :

Answer: A) Flower Explanation:

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