Name: The Relationship Between Classification and Evolution
Uploaded: 2019-07-19
Duration: 8 min 21 s
Description: Why are some organisms classified as lower and some as higher in the classification hierarchy? How do we find out which organism came earlier into existence?

Question

Thallophyta, Bryophyta, and Pteridophyta are called as 'Cryptogams'. Gymnosperms and angiosperms are called 'phanerogams'. Discuss why. Draw one example of gymnosperm.

Accepted Answer

The embryo is the structure in plants that develops from the zygote prior to germination. Thallophyta, Bryophyta, and Pteridophyta have naked embryos that are called spores. Also, their reproductive organs are very inconspicuous, and hence they are called 'cryptogamae' (Gr. Crypto — hidden + gamous — marriage) which is meant by “those with hidden reproductive organs”.

Seeds bearing plants are the plants that form seeds as a result of sexual reproduction. The seeds consist of the embryo along with stored food which is utilized during germination. Gymnosperms and angiosperms are the seeds bearing plants. Also, having a differentiated plant body into roots, stem and leaves in addition to the vascular system, gymnosperms and angiosperms are called 'phanerogams.'

A diagram of Pinus plant which is an example of a gymnosperm.

Gymnosperms are non-flowering plants that bear cones as shown in the diagram. Based on their lifespan, they are perennial. These are evergreen and woody plants.

Thallophyta, Bryophyta, and Pteridophyta are called as 'Cryptogams'. Gymnosperms and angiosperms are called 'phanerogams'. Discuss why. Draw one example of gymnosperm.

Important Questions on Diversity in Living Organisms

Learn and Prepare for any exam you want !