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(1) sepals which protect the delicate stamens and pistils when the flower is in the bud stage;
(2) petals which attract pollinating insects;
(3) stamen which consists of a stalk and a pollen sac called an anther which produces pollen which in due course contains pollen grains. (For this reason the stamens are called male sex organs of the plant);
(4) pistil which consists of an ovary, style and stigma; the ovary produces one or more ovules which in due course contains, with other cells an egg. (For this reason the pistil is called the female sex organ of the plant).
A plant develops flowers after it has attained maturity in its vegetative parts. It has two parts, the pedicel or the stalk and the thalamus or the swollen tip with the floral parts.
Many flowers possess bright colours, perfume and nectar (sugary liquid) to attract insects for pollination.
Gynaecium or Pistil is the female reproductive whorl which is made up of three parts, stigma, style and ovary. The stigma receive the pollen grains; the style is the tubular stalk which connects stigma to the ovary which is the swollen basal part formed by the union of one or more carpels which are formed like chambers. A pistil may have only one carpel or two or more. Within each carpel are seen one or many ovules, each arising along the projection called placenta. The ovule attaches to the placenta by a short stalk. In the ovule is an embryo sac with an egg or the female gamete. During fertilization, one of the male gametes from the pollen fuses with the egg.
The flowers which contain all four of the main parts are called complete flowers while others are called incomplete flowers.
One of the most conspicuous features of the plant kingdom to the layman and botanist alike is the infinite variety of size, form, and behaviour of its members. Plants vary in size from structurally simple, microscopic organisms such as bacteria, some of which are only 1/2 micron long by 1/
JAIN BIOLOGY
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| SR No. | 006905 |
| Book Title | Jain Biology |
| Original Sutra Author | N/A |
| Author | Jethalal S Zaveri, Mahendramuni |
| Publisher | Jain Vishva Bharati |
| Publication Year | 2008 |
| Total Pages | 152 |
| Language | English |
| Classification | Book_English |
| File Size | 13 MB |