Pollen grains can be preserved as fossil because Option 1 : They vary from species to speciesOption 2 : They have variety of architectureOption 3 : They are made up of sporopolleninOption 4 : They exhibit a fascinating array of pattern and design

Sporopollenin is Option 1 : Most resistant organic matter knownOption 2 : Present in exine of pollen grainOption 3 : Absent in the germ pole of pollen grainOption 4 : All of these

Exine of pollen is(A) Hard outer layer of pollen grain(B) Most resistant organic matter known.(C) Layer made up of sporopollenin.(D) Layer which can withstand high temperature, strong acids and alkali.(E) Layer which cannot be degraded by any known enzyme. Option 1 : A and BOption 2 : A, B, C ...

Pollen grains are Option 1 : SphericalOption 2 : OvalOption 3 : Generally sphericalOption 4 : Irregular

Diameter of pollen grain is Option 1 : 20–50 μmOption 2 : 25–50 μmOption 3 : 30–50 μmOption 4 : 10–50 μm

Male gametophyte in angiosperm is represented by Option 1 : AntherOption 2 : AndroeciumOption 3 : MicrosporangiumOption 4 : Pollen grain

Pollen grains are Option 1 : Microspore tetradOption 2 : Dehydrated microsporesOption 3 : Megaspore tetradOption 4 : Pollen mother cells

Formation of pollen from pollen mother cell is referred to as Option 1 : PollenogenesisOption 2 : MegasporogenesisOption 3 : MicrosporogenesisOption 4 : Ovulation

Sporogenous tissue of microsporangia is Option 1 : Groups of compactly arranges homogenous cellsOption 2 : Occupies the centre of microsporangiumOption 3 : Present inside young antherOption 4 : All the above

Each cell of microspore tetrad is Option 1 : 2nOption 2 : nOption 3 : Some n and some 2nOption 4 : 3n