SALINITY
sanaThe soil in which salt crust is left due to evaporation of water is called saline soil and this problem is called salinity. A saline soil has electrical conductivity of…
Type : Laminaria – Occurrence , Structure & Reproduction
abidaOccurrence Laminaria is found along coasts of oceans. Most of the species are perennial. Vegetative structure Plant body The plant body is sporophyte. The sporophyte is differentiated into three parts:…
WATER LOGGING
The soil which is saturated with water is called water logged soil and this problem is called water logging. Causes of water Logging Pakistan has one of the best canal…
Conservation
The management of the earth resources to restore and maintain balance between human requirement and other species in the world is called conservation. Conservation includes continuous renewing of renewable resources.…
TYPE: Pinnularia – occurance ,reproduction & division
Occurrence Pinnularia is a fresh water alga. It is found in pond. It is also present on the moist soil It is unicellular. Its cell is elongated and elliptical. Cell…
BIODIVERSITY
The variety of living organisms in an ecosystem is called biodiversity. The exact number of species in the world is not known. The taxonomists have described about 1.4 million species.…
ARIDITY
The word arid means dry. The dry land is called arid land. This problem is called aridity. Arid climate is defined as the climate in which precipitation is less than…
PHYLUM PLATYHELMINTHES
saadiaPHYLUM PLATYHELMINTHES Phylum Platyhelminthes contains over 20.000 animal species. They show following characters: They are flat- worms. They range in adult size from 1mm or less to 25 m. Parenchyma…
OBJECTIVE FOR ECOSYSTEM
Multiple Choice Questions (MCQs) The maximum percentage of energy changed into food is: (a) 10% (b) 20 (c) 30 (d) 5 Percentage of energy absorbed in atmosphere is: (a) 50 …
Triploblastic Acoelomate Body Plan
THE Triploblastic Acoelomate Body Plan EVOLUTIONARY PERSPECTIVE Members of the phyla Platyhelminthes, Nemertea and Gastrotricha show following advance characters: They are first bilaterally symmetrical animals. Therefore, they are more Complex…