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Current Question (ID: 15889)

Question:
Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements. Statements: (A) Wings of butterflies and birds look alike and are the results of _(i)_ evolution (B) Miller showed that CH₄, H₂, NH₃, and _(i)_, when exposed to electric discharge in a flask resulted in the formation of _(ii)_. (C) Vermiform appendix is a _(i)_ organ and an _(ii)_ evidence of evolution. (D) According to Darwin evolution took place due to _(i)_ and _(ii)_ of the fittest.
Options:
  • 1. (A) - (i) convergent, (B) - (i) oxygen, (ii) nucleosides
  • 2. (B) - (i) water vapour, (ii) amino acids, (C) - (i) rudimentary (ii) anatomical
  • 3. (C) - (i) vestigial, (ii) anatomical, (D) - (i) mutations, (ii) multiplication
  • 4. (D) - (i) small variations, (ii) survival, (A) - (i) convergent
Solution:
The correct answer is option 4. In statement (D), Darwin's theory of evolution is based on small variations and survival of the fittest. In statement (A), wings of butterflies and birds are examples of convergent evolution.

Import JSON File

Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}