Dead raw material for decomposition.

Partially decomposed organic matter.

Dead remains of animals & plants.

Botany - Ecosystem - Quiz-7

Given below is a hypothetical pyramid of energy. The amount of energy left at the level of secondary consumers would approximately be:

0%
10000 J
0%
1000 J
0%
100 J
0%
50 J

Addition of which of the following can prevent leaching of minerals?

0%
humus
0%
mycorrhizae
0%
rhizobia
0%
calcium

Detritus is

0%
Dead raw material for decomposition.
0%
Partially decomposed organic matter.
0%
Dead remains of animals & plants.
0%
Both 1 and 3

In most ecosystems, all the pyramids of number, energy and biomass are upright. It indicates that
(a) Producers are more in number and biomass than the herbivores.
(b) Herbivores are less in number and biomass than the carnivores.
(c) Energy at a lower tropic level is always more than at a higher level.
Choose the correct option.

0%
Only (a) is correct.
0%
Only (b) is correct.
0%
Both (a) and (c) are correct.
0%
Both (b) and (c) are correct.

What type of ecological pyramid would be obtained with the following data?

Secondary consumer: 120 g

Primary consumer: 60 g

Primary producer: 10 g

0%

Inverted pyramid of biomass
0%

Pyramid of energy
0%

Upright pyramid of numbers
0%

Upright pyramid of biomass

The primary producers of the deep-sea hydrothermal vent ecosystem are

0%

green algae
0%

chemosynthetic bacteria
0%

blue-green algae
0%

coral reefs

Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in:

0%

Tropical Rain Forest
0%

Grassland
0%

Temperate Forest
0%

Tropical Savannah

The term ecosystem was coined by

0%

A.G. Tansley
0%
E. Haeckel
0%
E. warming
0%
E.P. Odum

In which of the following both pairs have correct combination?

(a) Gaseous nutrient cycle Sedimentary nutrient cycle	Carbon and nitrogen Sulphur and phosphorous
(b) Gaseous nutrient cycle Sedimentary nutrient cycle	Carbon and sulphur Nitrogen and phosphorus
(c) Gaseous nutrient cycle Sedimentary nutrient cycle	Nitrogen and sulphur Carbon and Phosphorous
(d) Gaseous nutrient cycle Sedimentary nutrient cycle	Sulphur and phosphorous Carbon and nitrogen

0%

a
0%

b
0%

c
0%

d

In an ecosystem the rate of production of organic matter during photosynthesis is termed as

0%

net primary productivity
0%

gross primary productivity
0%

secondary productivity
0%

net productivity

Most animal are tree dwellers in a

0%

coniferous forest
0%
thorn woodland
0%
temperate deciduous forest
0%
tropical rain forest

Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.
312232

	A	B	C	D
1.	Rock minerals	Detritus	Litter fall	Producers
2.	Litter	Producers	Rock minerals	Detritus
3.	Detritus	Rock minerals	Producers	Litter fall
4	Producers	Litter fall	Rock minerals	Detritus

0%

1
0%

2
0%

3
0%

4

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?
Plant → mice →snake→ peacock\

0%

0.02 J
0%

0.002 J
0%

0.2 J
0%

0.0002 J

Pheretima and its close relatives derive nourishment from

0%

Sugarcane roots
0%

Decaying fallen leaves and soil organic matter
0%

Soil insects
0%

Small pieces of fresh fallen leaves of maize

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

0%

It occurs on a deforested site
0%

It follows primary succession
0%

It is similar to primary succession except that it has a relatively slow pace
0%

All of the above

Large woody vines are more commonly found in

0%

mangroves
0%

tropical rainforests
0%

alpine forests
0%

temperate forests

Quercus species are the dominant component in

0%

temperate deciduous forests
0%

alpine forests
0%

scrub forests
0%

tropical rain forests

Which of the following ecological pyramids is generally inverted?

0%

Pyramid of biomass in a sea
0%

Pyramid of numbers in grassland
0%

Pyramid of energy
0%

Pyramid of biomass in a forest

In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?

0%

Gross primary productivity is always more than Net primary productivity.
0%

Gross primary productivity and Net primary productivity are one and same.
0%

There is no relationship between Gross primary productivity and Net primary productivity.
0%

Gross primary productivity is always less than net primary productivity.

Match the trophic levels with their correct species examples in the green land ecosystem

(a) Fourth trophic level (i) Cow

(b) Second trophic level (ii) Vulture

(d) Third trophic level (iv) Grass

Select the correct option:

(a) (b) (c) (d)

0%

(iii) (ii) (i) (iv)
0%

(iv) (iii) (ii) (i)
0%

(i) (ii) (iii) (iv)
0%

(ii) (iii) (iv) (i)

Which of the following statements is incorrect regarding the phosphorus cycle?

0%

Phosphates are the major form of phosphorus reservoir
0%

Phosphorus solubilizing bacteria facilitate the release of phosphorus from organic remains
0%

There is the appreciable respiratory release of phosphorus into the atmosphere
0%

It is a sedimentary cycle

The rate of decomposition is faster in the ecosystem due to the following factors EXCEPT:-

0%

Detritus rich in sugars
0%

Warm and moist environment
0%

Presence of aerobic soil microbes
0%

Detritus richer in lignin and chitin

Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :

	(a)	(b)	(c)	(d)
1	dog	squirrel	bat	Deer
2	Rat	Dog	Tortoise	crow
3	Squirrel	Cat	Rat	Pigeon
4	Deer	Rabbit	Frog	Rat

0%
1
0%
2
0%
3
0%
4

Which of the following representations shows the pyramid of numbers in a forest ecosystem –

0%

A
0%

B
0%

C
0%

D

In the equation GPP - R = NPP

R represents:

0%

Environment factor
0%

Respiration losses
0%

Radiant energy
0%

Retardation factor

Ecology can be best described as:

0%
the study of living things.
0%
the study of non-living things.
0%
the study of environmental factors.
0%
the study of ecosystems.

What would be true if you compare the flow of energy and the flow of chemical nutrients in an ecosystem?

0%
Much larger amount of energy flows through the ecosystem than the amount of nutrients
0%
Energy is recycled, but nutrients are not
0%
The requirement of nutrients is obligatory for organisms but the requirement of energy is not.
0%
Nutrients are recycled, but energy is not.

Identify the incorrect statement regarding primary productivity in an ecosystem?

0%
It occurs only through the process of photosynthesis.
0%
Almost all life on Earth relies directly or indirectly on primary production.
0%
Net primary production is available for consumption by herbivores.
0%
Gross primary productivity minus the respiratory loss is the net primary productivity.

In a terrestrial ecosystem, the abiotic factors that have most effect on its primary productivity will be:

0%
light and nutrients
0%
light and moisture
0%
temperature and moisture
0%
temperature and nutrients

During the carbon cycle, carbon dioxide is returned to the atmosphere by the plants through:

0%
Photosynthesis
0%
Decomposition of biomass
0%
Respiration
0%
Transpiration

0:0:1

Practice Botany Quiz Questions and Answers

0:0:1

Practice Botany Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.