Question

write the main differences between cycadales and bennettitales​

Answer 1

Answer:

Cycadales and bennettitales​ are both seed plants. They resemble each other but are different in many ways. These are the main differences between the two:

1. The girdling traces in the leaves are absent in bennettitales​ but are present in cycadales.

2. The type of stomata which are the openings in leaf are syndetocheilic in bennettitales​ while it is haplocheilic in cycadales.

3. Some cones of bennettitales are bisporangiate while there is none in cycadales.

4. The bracts (flower) of bennettitales are perianth while it is absent in cycadales.

5. The microsporangia of bennettitales is synangiate and not synangiate in cycadales.

Answer 2

Answer:

Explanation:

Main differences between the cycadales and bennettitales are described as under:

1) Gridling leaf traces are absent in bennettitales.

  Gridling leaf traces are present in cycadales.

2) Pitting is circular bordered/ scalariform in bennettitales.

   Pitting is circular bordered in cycadales.

3) Stomata are syndetocheilic in bennettitales.

   Stomata are haplocheilic in cycadales.

4) Bisporangiate cones are present  in bennettitales.

    Bisporangiate cones are absent  in cycadales.

5) Perianth of bracts are present in bennettitales.

   Perianth of bracts are absent in cycadales.

6) Microsporangia are synangiate in bennettitales.

   Microsporangia are not synangiate in cycadales.

7) Nucellus Separates from integument at base in bennettitales.

  Nucellus Separates from integument in midregion in cycadales.