Which vertical strata is occupied by trees in a forest?

  • Top

  • Middle

  • Bottom

  • Any of the above.

Which of the following could affect the rate of function of a pond?

  • The solar input

  • The cycle of temperature

  • Day-length

  • All of the above

The basic requirement for any ecosystem to function and sustain is

  • Enormous amount of water

  • Constant input of solar energy

  • Fertile soil

  • Oxygen

The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called as-

  • Biomass production

  • Primary production

  • Secondary production

  • Assimilation

Primary production is expressed in terms of-

  • Grams

  • Grams/year

  • Gram/m2

  • Gram/m2/year

What do you mean by Productivity?

  • Rate of biomass production

  • Amount of biomass production

  • Biomass produced in an area

  • Biomass produced in a time period

Secondary productivity is defined with respect to-

  • Producers

  • Consumers

  • Ratio of producers and consumers

  • Trophic level

Primary productivity of an terrestrial ecosystem depends upon

  • Photosynthetic capacity of plants.

  • A variety of environmental factors,

  • Availability of nutrients

  • All of the above.

What is the annual net primary productivity of the whole biosphere

  • 160 billion tons

  • 170 billion tons

  • 177 billion tons

  • 190 billion tons

Which of the following contributes the maximum to the net primary productivity?

  • Ocean ecosystem

  • Land ecosystem

  • Pond ecosystem

  • Man-made ecosystem

Why do we call the earthworm as the farmer’s friend?

  • It eats the pests

  • It prevents the growth of weeds

  • Makes the soil fertile by burrowing

  • They help in the breakdown of complex organic matter as well as in loosening of the soil.

Which of the following is not a step in the process of decomposition?

  • Fragmentation

  • Leaching

  • Anabolism

  • Humification.

What is the process by which Detritivores break down the detritus into smaller particles.?

  • Degradation

  • Decomposition

  • Fragmentation

  • Leaching

What does the process of leaching refers to-

  • Accumulation of a dark coloured amorphous substance

  • Organic solvents reabsorbed by the plants

  • Inorganic solvents get precipitated out of the soil

  • Water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts.

In the process of decomposition ‘catabolism’ is performed by-

  • Earthworms

  • Bacteria

  • Bacteria and fungi

  • Fungi

Which of the following is the substrate in the process of mineralisation?

  • Detritus

  • Humus

  • Organic matter

  • None of the above

Which of the following does not affect rate of decomposition?

  • Substrate composition

  • Soil moisture

  • Temperature of soil

  • CO₂

Decomposition would be fast if the detritus contains-

  • Cellulose

  • Lignin and chitin

  • Nitrogen and water soluble sugars

  • Cellulose and pectin

Which of the following promotes the process of decomposition?

  • Warm and moist environment

  • low temperature

  • Anerobiosis

  • Lignin and chitin rich detritus

What is the source of energy for all ecosystems on Earth?

  • Sun

  • Hydrothermal vents

  • Lava

  • Both ‘1’ and ‘2’

What percentage of the incident solar radiation is photosynthetically active radiation (PAR)?

  • 50%

  • Less than 50%

  • More than 50%

  • 10%

What proportion of the PAR (photosynthetically active radiation) is captured by plants?

  • 1 - 10%

  • 2 - 10%

  • 5 - 15%

  • 5 - 25%

Which are the primary consumers in a grazing food chain?

  • Carnivores

  • Herbivores

  • Detrivores

  • Omnivores

What do secondary carnivores refer to?

  • Animals at second trophic level

  • Those animals that depend on the herbivores for food

  • Those animals that depend on the primary carnivores for food

  • Those animals that depend on the secondary herbivores for food

The detritus food chain (DFC) begins with________________. It is made up of decomposers which are ______________organisms, mainly________________. They meet their energy and nutrient requirements by degrading ______________.

  • detritus, heterotrophic, earthworm and dead organic matter.

  • dead organic matter, heterotrophic, fungi and bacteria, dead organic matter.

  • dead organic matter, autotrophic, fungi and plants, dead organic matter.

  • grass, heterotrophic, fungi and bacteria, dead organic matter.

What is the major conduit for energy flow in an aquatic ecosystem?

  • Grazing food chain

  • Detritus food chain

  • Sun

  • Hydrothermal vents

Identify the odd one out.

  • Cockroach

  • Crow

  • Humans

  • Goat

“Detritus food chain may be connected with the grazing food chain at some levels” this is evident from
(i). Some of the organisms of DFC are prey to the GFC animals
(ii). In a natural ecosystem, some animals like cockroaches, crows, etc., are omnivores.
(iii). Some of the organisms of GFC are facultative decomposers

  • i and iii

  • i and ii

  • ii and iii

  • i only

What do you mean by a foodweb?

  • Group of food chains.

  • Food chains present in a particular area

  • Natural interconnection of food chains

  • Food chains formed by members of a genus

Based on the source of organism’s nutrition or food, they occupy a specific place in the food chain that is known as-

  • Strata

  • Trophic level

  • Sere

  • Chain level

0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Botany Quiz Questions and Answers