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Current Affairs January 2024

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4

The source of energy in the ecosystem is:

A. decomposition of animals and plants by bacteria

B. photosynthesis by green plants

C. fermentation of sugars

D. sun-light

Correct Answer :

B. photosynthesis by green plants


Related Questions

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Biologists celebrate 5th June as

A. Darwin's birthday

B. World hygiene day

C. World environment day

D. World population day

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Which one of the following is associated with the conservation of forest ?

A. Bharatpur

B. Kaziranga

C. Silent Valley

D. Gir

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Correct definition of ecosystem is :

A. A community of organisms interacting with one another

B. The abiotic component of a habitat

C. The part of the earth and its atmosphere which inhabits living organisms

D. The community of organisms together with environment in which they live

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Mark which is true

A. A food chain is a chain of food consumers

B. A food chain is chain of food producers

C. A food chain is a series of organisms through which food energy flows in an ecosystem

D. None of the above

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In grassland ecosystem the pyramid of energy is

A. upright

B. inverted

C. upright or inverted

D. none of these

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Biosphere is:

A. In which individuals interact with each other

B. In which life originated

C. The name of a bird

D. Organic compound by which life diminih

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First link in any food chain is green plant because

A. green plants systhesize food

B. the green plants eat everything

C. they are fixed at a place

D. none of these

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The ultimate source of energy for fish is

A. Protozoa

B. Oxygen produced by plants

C. Sunlight

D. Manure in the soil

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Pedology is the study of

A. soil

B. locomotion of animals

C. rocks

D. crop diseases

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The nitrifying bacteria which oxidise nitrite to nitrates include

A. Nitrosomonas

B. Azotobacter

C. Nitrobacter

D. Closteridium

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Commensalism is

A. when both organisms are benefited

B. when one organism is benefited without affecting the other

C. when one organism is affected

D. when both organisms are affected

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Tropical evergreen forests are seen in

A. Himachal Pradesh

B. Haryana

C. Tamil Nadu

D. Assam

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An American plant which had become a troublesome weed in India is

A. Typha latifolia

B. Cyperus rotundus

C. Parthenium

D. Eichhornia

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Primary treatment of sewage means

A. encouragement of growth of microbes to decompose sewage

B. disinfection of sewage

C. removal of heavy grit from sewage in the settling chambers

D. pumping of sewage into aeration tanks for increased microbial activity

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Increasing accumulation of DDT in organisms of a food chain in higher trophic levels is known as

A. biotic potential

B. biotic component

C. biological value

D. biological amplification

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In cities like Mumbai and Delhi, the major air pollutants are

A. ozone

B. carbon monoxide and oxides of sulphur

C. hydrocarbons and hot air

D. algae spores and marsh gas

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Hie sequence blue green algae > crustose lichens � foliose lichens > mosses � shrubs � dicotyledonous tree represents

A. a food chain

B. genetic drift

C. ecological succession trend

D. a phylogenetic trend

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Competition for food, light and space is most severe in

A. closely related species growing in the same niche

B. closely related species growing in different habitats

C. distantly related species growing in same habitat

D. distantly related species growing in different habitats

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Radiation is a health hazard as it causes

A. leukaemia

B. polio

C. pneumonia

D. haemophilia

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The biggest herbarium of India is

A. Botanical Survey of India - Calcutta

B. St. Xavier's Herbarium - Mumbai

C. Central National Herbarium - Calcutta

D. IARI - New Delhi

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4

Which is the correct food chain

A. grass � wolf > deer > buffalo

B. bacteria � grass � rabbit > wolf

C. grass � insect � bird � snake

D. grass > snake �insect � deer

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One of these is a renewable source of energy:

A. Solar energy

B. Hydro-power

C. Natural gas

D. All of these

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. Biome is

A. the flora on land

B. the flora in ocean

C. a community of organisms interacting with each other

D. that part of earth and its atmosphere which inhabits living organisms

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The least porous soil among the following is

A. loam soil

B. clay soil

C. sandy soil

D. poeaty soil

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A pollutant is any substance, chemical or other factor that changes

A. natural geochemical cycles

B. the natural flora of a place

C. the natural wild life of a region

D. the natural balance of our environment

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Deforestation may reduce the chances of

A. frequent cyclones

B. rainfall

C. frequent landslides

D. erosion of soil surface

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What is the major constituent of biomass of an organism

A. Nitrogen

B. Carbon

C. Phospnorus

D. Oxygen

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Plankton, Nekton and Itenthon are not the components of one of the following ecosystems:

A. Marine

B. Freshwater

C. Grassland

D. Pond

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Water plants usually have

A. a well developed root system

B. a well developed vascular system

C. a well developed stomatal system

D. a reduced vascular system

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Which of the following functions performed by forests help most in controlling drought

A. Forest prevent soil erosion

B. Forests act as water sheds

C. Forests have lots of water plants

D. Forests bring rainfall, in monsoon