Posts

Showing posts with the label semester 2 KB mam

Economical importance of bryophytes

-
ECOLOGICAL IMPORTANCE OF BRYOPHYTES Mosses and Bryophytes are the first organiasms to colonise rocks. They colonise rock by acidic secretion. This acidic secretion is due to the death of mosses. When the rock is decomposed it helps in soil formation. Therefore New soils are formed. The soil act as binders.  It prevent soil erosion. The water retention capacity of the soil is high ie, water holding capacity of the soil is high.  This reduces surface water run-off which prevent soil erosion. Bryophyte helps in the recycling of nutrients. ECONOMICAL IMPORTANCE OF BRYOPHYTES. 1) SPHAGNUM Sphagnum has high absorptive power with antiseptic property. This can be used to replace cotton in bandages. 2) MERCHANTIA   Mercahntia cures pulmonary tuberculosisand affliction (pain) in liver. Antibiotic substances are also extracted from bryophytes. it also acts as antiseptic, and as preservative POLYTRICHUM Polytrichum dissolove stone in kidney and in gall bladder. 3) IN RESEARCH It is u...
1 comment
Read more

Bryophytes introduction

-
BRYOPHYTES -ARE CALLED AMPHIBIANS OF PLANT KINGDOM -Have jacketed sex organ -Rhizoids are present  -non vascular in nature -Leafy structure develop in higher group -have differentiated body design   - no specialised tissue for conduction of water. - example  funeraria and merchantia ADOPTATION TO LAND HABITAT 1) DEVELOPMENT OF ORGAN FOR        ATTACHMENT AND ABSORPTION OF WATER   Bryophytes don't grows on water as like algae. They grows on land. Hence, Rhizoids develop. Rhizoids function as absorbing and attaching organ. (Absorb nutrients, remain attached to the plant) 2) protection against desiccation   Thick compact multicellular thallus covers with epidermis   1)As they are in compact form, the total surface area of bryophytes reduces proportionately as per the volume. Their surface area decreases, hence transpiration also decreases/reduced. 2) epidermis protect from drying effect of air reduces effect of desiccation. Desic...
Post a Comment
Read more