Q 1. Arrange the following terms in the correct developmental sequence: Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes.
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Explanation:

Pollen grain is the first cell of male gametophyte wherein male gamete develops. The correct sequence is sporogenous tissue, pollen mother cell, microspore tetrad, pollen grain and male gamete.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

layer 3 is younger than layer 6.