Showing posts with label Gymnosperm. Show all posts
Showing posts with label Gymnosperm. Show all posts

27 July 2021

Cycas

This plant is Cycas. It looks similar to a palm tree. These trees are very rare in number. However, they are available for sale in nearby plant nurseries. It grows very slowly. So the plant is costly to buy. 

Cycas is a gymnosperm. The gymnosperms are the plants in which ovules are not enclosed by an ovary wall. After fertilisation the seeds remain exposed and therefore these plants are called naked-seeded plants. The gymnosperms produce microspores and megaspores which are produced in microsporangia and megasporangia borne on the sporophylls. 



18 November 2020

Morpankhi plant

This is an oriental thuja (मोरपंखी) plant (Platycladus orientalis also called Thuja orientalis). 
It is a gymnosperm and belongs to cypress family. It is used as ornamental plant or as hedges in gardens. 

11 November 2020

Class 11 Gymnosperm

The gymnosperms have ovules which are not enclosed by any ovary wall. The seeds remain exposed after fertilization and so these plants are called naked-seeded plants. The gymnosperms produce microspores and megaspores in microsporangia and megasporangia respectively. Microsporangia are borne on microsporophylls while megasporangia are borne on megasporophyll. These sporophylls are arranged spirally on axis to form male and female cones. The pollen grain germinates and pollen tube releases the male gamete into the ovule, where it fuses with the egg cell in archigonia. After fertilization, the zygote develops into embryo and the ovules into seeds. 
Note: The above notes in the image(s) are taken from a personal notebook which was initially not intended to be shared online. Please excuse the rough handwriting and spelling errors, if any.