General Knowledge

Boost your exam preparation with the latest General Knowledge MCQs with answers and explanations. Our collection covers current affairs, world geography, history, Pakistan studies, sports, science, technology, and important international organizations. These General Knowledge multiple-choice questions are designed for students, job seekers, and competitive exam aspirants preparing for NTS, PPSC, FPSC, CSS, PMS, university entry tests, and recruitment exams. Practice online with updated General Knowledge MCQs to improve awareness, sharpen memory, and score higher in tests and interviews.

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1642. The undesirable change in physical, chemical or biological characteristics of air, land and water is referred as

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A. Pollutants
B. Ecodestructions
C. Pollution
D. All of these
✅ The correct answer is option C.
Pollution is any undesirable change in the physical, chemical or biological characteristics of air, water or land. Pollution can harm the health and threaten the survival or activities of human beings and other living organisms.

1644. The animal which consumes decaying organic matter is _________

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A. Carnivore
B. Detritivore
C. Herbivore
D. Producers
✅ The correct answer is option B.
A detritivore is an animal feeding on decaying organic matter. It is a heterotroph that obtains nutrients by consuming detritus. Examples include millipedes, earthworms, fiddler crabs, sea cucumbers.

1645. The pioneers in xerach succession is the

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A. crustose lichen
B. mosses
C. foliose lichen
D. shrubs
✅ The correct answer is option A.
The pioneer species in xerarch and hydrarch succession are lichens and phytoplanktons respectively. Xerarch is a plant succession starting on bare ground or rock and culminating in a mature climax forest. The pioneer species, such as lichens and mosses, result in the gradual accumulation of soil.

1647. The concept of ecological pyramid was first proposed by

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A. E.P. Odum
B. A.G. Tansley
C. Juday
D. Charles Elton
✅ The correct answer is option D.
Just as the name suggests ecological pyramids are in the shape of a pyramid. The concept was first introduced by Charles Elton, the pioneer British Ecologist. The bottom of an ecological pyramid is the broadest and is occupied the producers, which form the first trophic level.

1649. The outermost zone of a biosphere reserve is

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A. manipulation zone
B. core zone
C. buffer zone
D. all the above
✅ The correct answer is option A.
The outermost zone of a biosphere reserve ismanipulation zone. The transition area is the outermost part of a biosphere reserve. This is usually not delimited one and is a zone of cooperation where conservation knowledge and management skills are applied and uses are managed in harmony with the purpose of the biosphere reserve.

1650. The species of plants that play a vital role in controlling the relative abundance of other species in a community are called

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A. Edge species
B. Link species
C. Pioneer species
D. Successional species
✅ The correct answer is option E.
A keystone species is a plant or animal that plays a unique and crucial role in the way an ecosystem functions.