DESERTIFICATION
sanaSpreading of deserts to the green areas is called desertification. Desertification occurs due to human activities. Desertification occurs in grasslands and forests. Earlier, vegetation was present there. But over exploitation…
Batrachospermum life cycle – Occurrence , Structure , growth & reproduction
abidaBatrachospermum life cycle Occurrence Batrachospermum is fresh water alga. It is found in clear, cool and running streams. Deep water plants are dark violet or reddish in colour. But the…
SOIL EROSION
The wearing away of the soil by wind, water, snow or gravity is called soil erosion. Climatic, topographic. biotic, edaphic, and geologic factors cause the soil erosion. Climatic factors: Wind…
Ectocarpus Occurrence, Structure ,Reproduction & Division
Occurrence Ectocarpus is a brown alga. It is abundantly found throughout the world in cold waters. A few species occur in fresh waters. The plant grows attached to rocks and…
POLLUTION
Pollution has been defined by Odum (1971) as "the undesirable change in the physical, chemical or biological characteristics of air, land and water that may affect the human life. The…
CLASSIFICATION
saadiaCLASSIFICATION Phylum platyhelminthes has four classes: (a) Class Turbellaria They have over 3, 000 species. They are free-living and aquatic External surface is ciliated. They are predators. They possess rhabdites,…
SHORT QUESTIONS OF ANGIOSPERMIC FAMILIES
sidraGive medicinal and condiment uses of family Ranunculaceae: ANS:Medicinal plants: Some members are used as medicinal plants. Aconitwn yields an alkaloid aconitina. Thu ields mamira. It is used in the…
SALINITY
The 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
Occurrence 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…