Who give the natural classification of spermatophytae
Answers
3. Division Spermatophyta
This division comprises all the seed bearing plants. They are familiar green plants which produce seeds through flowers or cones.
General characteristics
The plant has roots, stems, leaves and seed bearing structures
They produce seeds
They have chlorophyll hence photosynthetic
They have vascular tissue is highly developed with xylem tissue consisting of both xylem tissue and tracheids.
The division spermatophyte consists of two main subdivisions:
Gymnospermatophyta
Angiospermatophyta.
Gymnospermatophyta
Characteristics
They bear cones of two types, male and female
After fertilization seeds are not enclosed in a fruit wall.
They show some xerophytic characteristics such as rolled leaves, needle-shaped leaves, sunken stomata and thick waxy leaves
Xylem consists mainly tracheids while phloem does not have companion cells.
This division comprises all the seed bearing plants. They are familiar green plants which produce seeds through flowers or cones.
General characteristics
The plant has roots, stems, leaves and seed bearing structures
They produce seeds
They have chlorophyll hence photosynthetic
They have vascular tissue is highly developed with xylem tissue consisting of both xylem tissue and tracheids.
The division spermatophyte consists of two main subdivisions:
Gymnospermatophyta
Angiospermatophyta.
Gymnospermatophyta
Characteristics
They bear cones of two types, male and female
After fertilization seeds are not enclosed in a fruit wall.
They show some xerophytic characteristics such as rolled leaves, needle-shaped leaves, sunken stomata and thick waxy leaves
Xylem consists mainly tracheids while phloem does not have companion cells.