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In gymnosperms : 1. The gymnosperms are heterosporous. 2. They produce diploid microspores and megaspores. 3. The two kinds of spores are produced within sporangia 4. Sporangia are borne on sporophylls which are arranged spirally along an axis to form lax or compact strobili or cones. Regarding 1,2,3 and 4:

( a ) 1 and 2 are correct; 3 and 4 are incorrect
( b ) 4 is incorrect; 1,2 and 3 are correct
( c ) 3 and 4 are correct; 1 and 2 are incorrect
( d ) 2 is incorrect; 1,3 and 4 are correct
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(D) is the right answer.

The gymnosperms are heterosporous; they produce haploid microspores and megaspores. The two kinds of spores are produced within sporangia that are borne on sporophylls which are arranged spirally along an axis to form lax or compact strobili or cones.
answered Jan 6, 2014 by pady_1
 

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