Q.12 Write a note on Dengue Fever. Answer: Introduction It is a viral infection transmitted through a mosquito Aedes aegypti. Occurrence It has become a major health problem in tropical and sub-tropical countries, including Pakistan. Types of Dengue Virus There are four types of dengue viruses. Recovery from infection by one provides lifelong immunity against …
Q.11 Explain Conservation of Nature Answer: Definition Conservation of nature means the conservation of natural resources. Everything that we use or consume e.g. food, petrol etc. is obtained from natural resources Types of resources a. Renewable natural resources b. Non-renewable resources a) Renewable natural resources. The renewable natural resources e.g. air is reproduced easily. b) …
Q.10 Define and explain different types of Pollution. Answer: Definition Pollution is defined as any undesirable change in the physical, chemical or biological characteristics of air, water and land that may harmful for humans, other living organisms and natural resources. Pollutants โข The agents which are responsible for pollution are called pollutants. Types of Pollutants …
Q.10 Define and explain different types of Pollution. Read More »
Q.9 Explain Ecosystem Balance and Human Impact. Answer: (a) Interaction among organisms The interactions among organisms and between organisms and their abiotic components of their environment produce steady and balanced ecosystem. (b) Biogeochemical cycles Biogeochemical cycles also maintain the balance in ecosystems by recycling natural resources, so that they do not deplete. (c) Disturbance of …
Q.8 Explain various types of interactions in an ecosystem. In all ecosystems, there are many kinds of interaction among living organisms. (i) Intraspecific interactions The interactions between the members of the same species are called intraspecific interactions (ii) Interspecific interactions The interactions between the members of different species are called interspecific interactions. Some important interactions …
Q.8 Explain various types of interactions in an ecosystem. Read More »
Q.7 Define biogeochemical cycles. Also explain different cycles in ecosystem. Answer: Source of bioelements Environment provides bioelements which are used by organisms for their bodies and metabolism. The materials are continuously recycled between organisms and environment. They are also called nutrient cycles. Biogeochemical cycles Biogeochemical cycles are the cyclic pathways through which materials move from …
Q.7 Define biogeochemical cycles. Also explain different cycles in ecosystem. Read More »
Q.6 Describe types of Ecological Pyramids. Answer: Definition Ecological pyramid can be defined as, โA representation of the number of individuals or amount of biomass or energy present in various trophic levels of a food chain”. Explanation In 1927, Charles Elton (an English ecologist) developed the concept of ecological pyramids. He noted that the animals …
Q.5 Explain Flow of Materials in an Ecosystem. Answer: Introduction The materials flow from one trophic level to the next by means of food chains and food webs. Food Chain A food chain is a series of organisms within an ecosystem, in which each organism feeds on the one before it and is fed by …
Q.4 Explain Flow of Energy in an Ecosystem. Answer: In an ecosystem, energy as well as materials travels from one trophic level to the next. Trophic Level Trophic level is the level at which an organism feeds in food chain. The first trophic level is made of producers; the second of primary consumers and so …
Q.3 Explain Components of Ecosystem. Answer: An ecosystem is comprised of two basic parts 1) Biotic Components Definition The living parts (organisms) of the ecosystem is called biotic components, Examples โข Producers (Plants, Algae and Cyanobacteria) โข Consumers (Animals, Protozoa) โข Decomposers (Bacteria and Fungi) 2) Abiotic Components The non-living factors present in ecosystem are …