Ecosystem · Question 20

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

1. Net primary production
2. Secondary production
3. Primary production
4. Gross primary production

The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred to as :

1. Standing crop
2. Climax
3. Climax community
4. Standing state

Which of the following statements is not correct?

1. Pyramid of numbers in a grassland ecosystem is upright
2. Pyramid of biomass in sea is generally inverted.
3. Pyramid of biomass in sea is generally upright.
4. Pyramid of energy is always upright.

In the equation GPP - R = NPP R represents :

1. Respiration losses
2. Radiant energy
3. Retardation factor
4. Environmental factor

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

1. There is no relationship between Gross primary productivity and Net primary productivity
2. Gross primary productivity is always more than net primary productivity
3. Gross primary productivity is always less than net primary productivity
4. Gross primary productivity and Net primary productivity are one and same

Match the trophic levels with their correct species examples in grassland ecosystem. Select the correct option

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
4. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)

Which of the following ecological pyramids is generally inverted?

1. Pyramid of biomass in a forest
2. Pyramid of biomass in a sea
3. Pyramid of numbers in grassland
4. Pyramid of energy

What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g

1. Inverted pyramid of biomass
2. Pyramid of energy
3. Upright pyramid of numbers
4. Upright pyramid of biomass

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

1. Grassland
2. Tropical Savannah
3. Temperate Forest
4. Tropical Rain Forest

Which ecosystem has the maximum biomass ?

1. Pond ecosystem
2. Lake ecosystem
3. Grassland ecosystem
4. Forest ecosystem