MARINE ECOSYSTEM
abidaMarine ecosystems are found in the oceans. Marine environments are characterized by an average salt concentration of 3%. Oceans cover nearly three fourths of surface df the earth. There is…
Ecology – types and levels
sanaThe term ecology is derived from Greek words oikos, meaning the "family household", and logy. meaning "to study". This term was formed by the German zoologist Ernst Haeckel in 1866.…
Stream and Rivers
The fresh water bodies in which water moves continuously in one direction are called streams and rivers. The head water of a stream is cold and clear. It carries little…
FRESH WATER LAKES AND PONDS
Fresh water lakes have variety of size, depth, and nutrient content. The have distinct life zones and temperature stratification. The distribution of life in lakes depends on light, nutrients and…
ECOSYSTEMS OF THE EARTH
There are two types of ecosystems: 1. Aquatic or Hydrospheric ecosystem: It is system in which living components exchange material and transfer energy within water. Aquatic environment is classified into…
COMMUNITIES AND ECOSYSTEM
COMMUNITIES Community is composed of all populations living in an area. Communities are not random mixtures of species. They have a unique organization. Most communities have certain important members. These…
Morphological characters of Inflorescence & types
sidraA group of flower is called inflorescence. Most flowers develop scorpioid cyme inflorescence. Small flower are inconspicuous. They collect together to form inflorescence to attract insects. The main axis of…
Subjective and Short Questions For Plant Movements
MODEL SUBJECTIVE QUESTIONS: Write a note on tropic movements. Write note phototrapism,Give its mechanism. Write note on geotropism. Give its mechanism. Write note on nastic novement. SHORT QUESTIONS: Differentiate between…
Plant Movements – Definition and Key Points
TERMS DEFINITIONS Autonomic movement. The movements induced by some internal causes are called autonomic movement. It example is ciliary movement. Paratonic movement The movement induced by external stimuli is called…
Objectives of Geneticengineering Biotechnology
rubabMultiple Choice Questions (MCQs) Which of the following restriction enzymes is used extensively: (a) Type! (b) Type II (c) Type III (d) Type IV Which of the followings is DNAase?…