Which one of the following is a characteristic feature of cropland ecosystem?

  • Least genetic diversity

  • The absence of weeds

  • Ecological succession

  • The absence of soil organisms

Which of the following would appear as the pioneer organisms on bare rocks?

  • Liverworts

  • Mosses

  • Green algae

  • Lichens

The term ecosystem was coined by

  • AG Tansley                 

  • E Haeckel

  • E Warming                 

  • EP Odum

Fill in the blanks, in the following simplified model of a nutrient cycle:

           1             2                    3                       4                  5

  • Producers   Detritus         Soil solution      Decomposition    Weathering

  • Producers   Detritus         Soil solution      Weathering         Decomposition

  • Producers   Soil solution   Detritus            Decomposition    Weathering

  • Producers   Soil solution   Detritus            Weathering         Decomposition

The given figure best represents:

  • Pyramid of number in parasitic food chain

  • Pyramid of biomass in forest ecosystem

  • Pyramid of number in grassland ecosystem

  • Pyramid of number in forest ecosystem

Regarding energy flow in an ecosystem:
 
  •     About 2 to 10 % of incident solar radiation is PAR
  •     An ecosystem is exempt from the Second Law of Thermodyanamics
  •     The amount of energy increases at successive trophic levels
  •     The number of trophic levels in a grazing food chain is limited

In which of the following both pairs have the correct combination?

(1)

 Gaseous nutrient cycle

 Sedimentary nutrient cycle 

Carbon and nitrogen

Sulphur and phosphorus
(2) 

Gaseous nutrient cycle

Sedimentary nutrient cycle 

Carbon and sulphur

Nitrogen and phosphorus
(3)

Gaseous nutrient cycle

Sedimentary nutrient cycle

Nitrogen and sulphur

Carbon and phosphorus
(4)

Gaseous nutrient cycle

Sedimentary nutrient cycle

Sulphur and phosphorus

Carbon and nitrogen 

  • 1
  • 2
  • 3
  • 4

Vertical distribution of different species occupying different levels in a biotic community is

known as 

  • divergence

  • stratification

  • zonation

  • pyramid

Secondary succession takes place on/in

  • bara rock

  • degraded forest

  • newly created pond

  • newly cooled lava

The mass of living material at a tropic level at a particular time is called

  • gross primary productivity

  • stading state

  • net primary producitivity

  • standing crop

Match the following and select the correct option.

     Column I                      Column II

A.  Earthworm                 1. Pioneer species

B. Succession                  2. Detritivore

C. Ecosystem service       3. Natality

D. Population growth        4. Pollination

  • 1           2         3         4

  • 4           1         3         2

  • 3           2         4         1

  • 2           1         4         3 

Secondary productivity is rate of formation of new organic matter by

  • producer

  • parasite

  • consumer

  • decomposer

Which one of the following processes during decomposition is correctly described?

undergoes microbial action at a very fast rate

  •   Fragmentation-Carried out by organisms such as earthworm

  •   Humification-Leads to the accumulation of a dark coloured substance humus, which

  •   Catabolism-Last  step in the decomposition under fully anaerobic condition

  •   Leaching-Water soluble inorganic nutrients rise to the top layers of soil.

Which one of the following is not a gaseous biogeochemical cycle in ecosystem?

  • Oxygen cycle

  • Phosphorus cycle

  • Nitrogen cycle

  • Carbon cycle

Identify the possible link A in the following food chain

Green plant -> Insect -> Frog -> A -> Eagle

  • rabbit                         

  • wolf

  • cobra                         

  • parrot

Given below is an imaginary pyramid of numbers. What could be one of the possibilities

about certain organisms at some of the different levels?

  • Level PC is insects and level SC is small insectivorous birds.

  • Level PP is phytoplanktons in sea and whale on top level TC

  • level one PP is pipal trees and the level SC is sheep

  • Level PC is rats and level SC is cats 

Which one of the following is not a functional unit of an ecosystem?

  • Energy flow                 

  • Decomposition

  • Productivity                 

  • Stratification

The upright pyramid of number is absent in

  • pond                           

  • forest

  • lake                           

  • grassland

Which one of the following statements is correct for secondary succession?

  • It occurs on a deforested site 

  • It follows primary succession

  • It is similar to primary succession except that it has a relatively fast pace

  • It begins on a bare rock

Which one of the following statements for pyramid of energy is incorrect, whereas the

remaining three are correct ?

  • It shows energy content of different trophic level organisms

  • It is inverted in shape

  • It is upright in shape

  • Its base is broad

Mass of living matter at a trophic level in an area at any time is called 

  • Detritus

  • Humus

  • Standing state 

  • Standing crop

Of the total incident solar radiation the proportion of PAR is 

  • about 60%

  • less than 50%

  • more than 80%

  • about 70%

The biomass available for consumption by the herbivores and the decomposers is called

  • net primary productivity

  • secondary productivity

  • standing crop

  • gross primary productivity

Which one of the following is one of the characteristics of a biological community ?

  • Stratification 

  • Natality 

  • Mortality 

  • Sex-ratio

The correct sequence of plants in a hyrdosere is 

  • Oak→Lantana →Scirpus→Pistia→Hydrilla→Volvax

  • Volvax→Hydrilla→Pistia→Scirpus→Lantana→Oak
  • Pistia→Volvax→Scirpus→Hydrilla→Oak→Lantana
  • Oak →Lantana→Volvax→Hydrilla→Pistia→Scirpus

Which one of the following types of organisms occupy more than one tropic level in a

pond ecosystem?

 

  • Phytoplankton       

  • Fish

  • Zooplankton         

  • Frog

About 70% of total global carbon is found in

  • grasslands

  • agro-ecosystems

  • oceans

  • forests

The slow rate of decomposition of fallen logs in nature is due to their

  • low moisture content

  • poor nitrogen content

  • anaerobic environment around them

  • low cellulose content

Consider the following statements concerning food chains

(i) Removal of 80% tigers from an area resulted in greatly increased growth of

vegetation

(ii) Removal of most of the carnivores resulted in an increased population of deers

(iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss

(iv) The length of food chains may vary from 2 to 8 trophic levels

Which two of the above statements are correct?

  • ii and iii

  • iii and iv

  • i and iv

  • i and ii

Quercus species are the dominant component in

  • temperate deciduous forests

  • alpine forests

  • scrub forests

  • tropical rain forests

0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Botany Quiz Questions and Answers