, explain how the leaves of gymnosperms are modified to which stand extreme conditions
, explain how the leaves of gymnosperms are modified to which stand extreme conditions
In these plants the seeds are not enclosed in an ovary, as in the flowering plants; they grow on the surface of a modified leaf in a strobilus or cone. "Gymnosperm" means naked seed. A seed contains a well-developed multicellular young plant with embryonic root, stem, and leaves already formed, whereas a plant spore is a single cell.The seed is protected by a multicellular coat. Seeds (and spores) can survive for extended periods of time at reduced rates of metabolism and then germinate when conditions become favorable.
This development made it possible for seed plants to complete their life cycles in relatively dry environments, compared to those of non-seed-producing vascular plants.
In these plants the seeds are not enclosed in an ovary, as in the flowering plants; they grow on the surface of a modified leaf in a strobilus or cone. "Gymnosperm" means naked seed. A seed contains a well-developed multicellular young plant with embryonic root, stem, and leaves already formed, whereas a plant spore is a single cell.The seed is protected by a multicellular coat. Seeds (and spores) can survive for extended periods of time at reduced rates of metabolism and then germinate when conditions become favorable.
This development made it possible for seed plants to complete their life cycles in relatively dry environments, compared to those of non-seed-producing vascular plants.
