SCIENCE
PLANT KINGDOM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Discharge of large quantities of Crous (yellow kesar) pollen grains into the air
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Discharge of large quantities of Pinus pollen grains into the air forming yellowish clouds.
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Release of a large amount of sulphur particles into the air from factories processing sulphur
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Release of a large amount of sulphur particles into the air near sulphur mines
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Detailed explanation-1: -As the pollen cones mature, they discharge large quantities of pollen grains into the air and it appears as a yellow cloud of yellow of winged pollen grains. This is called as sulfur shower and occurs during spring. Pollen grains are released and carried by the wind to the female cones.
Detailed explanation-2: -The Sulphur shower is a phenomenon by which the Pinus species release their pollen grains. The pollen grains of Pinus are yellow in colour. When the male cones release the pollens, they appear to be a yellow cloud. This is why the phenomenon is known as the Sulphur shower.
Detailed explanation-3: -: a shower of yellow pollen often seen in spring that is carried by the wind from conifers (such as pines)
Detailed explanation-4: -Winged pollen grains are found in Pinus. The outer exine of pollen extended on two lateral sides to form the wings. Pollination occurs by the wind.
Detailed explanation-5: -Complete answer: The winged pollen grain of Pinus is produced in microsporangium. Microsporangium produces spores which later will form male gametophyte at the time of germination. It occurs in the vascular plants where different male and female sporophytes are produced.