Maharashtra State PSC Model Paper 2

The correct answer is Acetylene.

• Calcium carbide is used to artificially ripen fruits.
  • Calcium carbide comes in contact with moisture it produces acetylene gas.
  • Calcium carbide is synthesized industrially from calcium oxide (lime), CaO, and carbon in the form of coke at about 2,200 °C (4,000 °F).
  • ${\mathrm{CaC}}_2$ is a chemical compound with a chemical name Calcium Carbide

• Methylene:
  • It is a colorless gas that fluoresces in the mid-infrared range and only persists in dilution, or as an adduct.
  • Methylene is the simplest carbene.
  • It is usually detected only at very low temperatures, or as a short-lived intermediate in chemical reactions.
• Florigen:
  • Florigen is the hypothesized hormone-like molecule responsible for controlling and triggering flowering in plants.
  • Florigen is produced in the leaves and acts in the shoot apical meristem of buds and growing tips. 
• Auxin:
  • Auxin was discovered by Darwin in the year 1880.
  • It Prevents the separation of the leaves.
  • It saves the crops from falling.
  • This is the hormone that controls the growth of plants.