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Current Question (ID: 13514)

Question:
Which of the following attribute started from Platyhelminthes
Options:
  • 1. Organ level of organisation
  • 2. Coelom
  • 3. Segmentation
  • 4. Closed circulatory system
Solution:
The attribute of having organ level of organization in animals is believed to have first evolved in the phylum Platyhelminthes, which includes flatworms. Platyhelminthes are the simplest animals to exhibit organ level of organization, where they possess specialized organs that perform specific functions, such as digestive, excretory, and reproductive functions. This is a step up in complexity from earlier forms of life that did not have specialized organs, such as sponges and other simpler animals. Options 2, 3, and 4 are not correct as they did not originate from Platyhelminthes. Option 2, coelom, is a body cavity that first appeared in more advanced animals, such as annelids and other higher invertebrates. Option 3, segmentation, is a characteristic feature of segmented animals, such as arthropods and vertebrates, but not flatworms. Option 4, closed circulatory system, is a more advanced circulatory system that is found in animals with higher levels of complexity, such as annelids, arthropods, and vertebrates, but not in flatworms.

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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
}