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Current Question (ID: 12520)

Question:

Which type of cells are not present in Phloem of monocot stem

Options:

1. Companion cell
2. sieve tubes
3. Phloem parenchyma
4. Phloem fibres

Solution:

Phloem in monocot stems typically lacks phloem fibers. Phloem fibers are elongated cells with thick cell walls that provide mechanical support to the phloem tissue. However, monocot stems have sieve tubes, companion cells, and phloem parenchyma as components of their phloem tissue. Sieve tubes are the conducting elements responsible for the transport of organic nutrients, while companion cells are adjacent nucleated cells closely associated with sieve tubes, providing energy and regulatory functions. Phloem parenchyma refers to the type of ground tissue composed of living cells associated with the phloem, which may have various functions including storage and metabolism.

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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
}