Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem is part of Kerala Plus Two Botany Chapter Wise Previous Year Questions and Answers. Here we have given Plus Two Botany Chapter 7 Ecosystem.
Kerala Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 7 Ecosystem
The products of ecosystem process are named as ecosystem services. List out any four such services. [March-2018]
Purify air and water, reduce global warming, mitigate droughts and floods, cycle, nutrients, generate fertile soils, provide wildlife habitat, maintain biodiversity, pollinate crops, provide storage site for carbon, provide aesthetic, cultural and spiritual values etc,
Pyramid of energy is never been inverted. Why? [March-2018]
When energy flow from a particular trophic level to the next higher trophic level, some energy is always lost as heat at each step.
An ecosystem consist of the following population: [March-2017]
Draw a food chain denoting each trophic level.
First trophic level → 2nd trophic level
Phytoplankton → Zooplankton →
3rd trophic level → 4th trophic level
Nutrients are never lost from the ecosystems and are recycled. Write about
a. gaseous cycle
b. sedimentary cycle [March-2016]
a. Gaseous cycle : In gaseous cycle the main reservoirs of nutrient elements are the atmosphere or water,
eg; Carbon cycle, oxygen cycle, nitrogen . cycle…. etc.
b. Sedimentary cycle : The reservoir is located in earth’s crust, eg; phosphorous cycle.
Ecological pyramids are usually up right. Me an while some, pyramid of biomass is inverted. Explain the religion. [March-2016]
Ecological pyramids are usually upright because energy will always flow from producer to consumers. Given below are the components related to simplified model of mineral cycling in a terrestrial ecosystem, Construct a flow chart.
(Hint: weathering of rock)
Given below are the components related to simplified model of mineral cycling in a terrestrial ecosystem, Construct a flow chart. (Hint: weathering of rock)
Primary succession of rocks is known as Xerosere. Answer the following related with Xerosere.
a. Name the pioneer community.
b. Organic acids have important roles in this succession. Justify. [March-2015]
a. Lichens are the pioneer community
b. Lichens secrete acids to dissolve the rock, helping in weathering and soil formation.
The species that invade a bare area are called…………. species. In a primary succession on rocks, the group that invade first are usually [March-2014]
Pioneer species. Lichens
The rate of biomass production in an eco-system is called productivity. They are of two types, gross primary productivity and net primary productivity. How these two productivities are related? [March-2014]
- Primary productivity and secondary poductivity.
- Gross primary productivity – The rate of total capture of light energy, or the rate of total production of biomass. Net primary productivity: The balance energy or biomass remaining after meeting the cost of respiration of producers.
[Net productivity = Gross productivity – respiration loss]
A list of different organisms in an ecosystem are given below. Arrange them in 1st, 2nd, 3rd and 4th trophic level.
iv. Zooplankton [March-2014]
An ecological pyramid of grass land ecosystem is given in the graph A.
a. Name the type of ecological pyramid given in the graph.
b. Explain the graph using the terms SC,TC, PP, PC.
c. Why the graph B is inverted? Explain with an example?
a. Pyramid of number.
b. In graph A, Primary producers (PP) are large in number, than the no. of primary consumers (PC), secondary consumers (SC), Teritiary consumers (TC) decreases gradually. This shows that, in a land area no. of producers are more than the no. of producers are more than the no. of successive trophic level. But graph B also exist. Inverted pyramid of number represents graph B. In this PP, SC, PC, TC are inverted (in number). Producers are less in number than successive trophic levels.
Final community that is in near equilibrium with environment in ecological succession is called [Model-2013]
Natural interlinked food chains are called……………….. [Model-2013]
A list of organisms are given. Place them in different trophic levels. Grass, Man, Fishes, Birds, Lion, Trees, Grasshopper, Zooplankton. [Model-2013]
Two types of ecological pyramids of a marine ecosystem are given. Analyse and answer the questions.
a. Identify the type of pyramids.
b. Give justification for the upright and inverted form of pyramid formation. [Model-2013]
a. A is pyramid of energy, B is pyramid of biomass.
b. In some ecosystem pyramid of biomass is inverted because the biomass of consumer are more than that of producers. The pyramid of energy is upright, energy is lost as heat at each step of flow from producers to consumers.
Analyse the different stages of succession and answer the question?
a. Identify the succession type?
b. Rearrange the stages of the succession in its correct sequence. [Model-2013]
a. It is hydrarch succession.
b. Phytoplankton g Reed swamp g Marsh meadow stage g Forest
Rate of biomass production is called productivity and can be divided into GPP and NPP.
a. Define GPP and NPP.
b. How can we relate GPP and NPP? [Say-2012]
a. Primary productivity and secondary activity.
b. Gross primary productivity – The rate of total capture of light energy, or the rate of total production of biomass. Net primary productivity: The balance energy or biomass remaining after meeting the cost of respiration of producers.
[Net productivity = Gross prpductivity – respiration loss]
The gradual and fairly predictable changes in the species composition in an area is called ecological succession.
a. Name the pioneer species in the primary succession in water.
b. Give the sequence of events and climax community in the hydrarch succession. [March-2012]
- Submerged stage
- Floating stage
- Reed swamp stage
- Sedge meadow stage
- Woodland stage
- Climax forest stage.
In a marine ecosystem, a population of phytoplankton (1,50,000) supports a standing crop of fishes (40,000).
a. Draw the pyramid of biomass.
b. The pyramid of numbers in this ecosystem. [March-2012]
Fill up the blanks with appropriate terms in the given pyramid of trophic Tertiary consumer level:
a. Secondary consumer
b. Primary consumer
Kalyani wrote man, hen, earthworm, mango tree in her note book. Arrange the terms in a food chain sequence. Explain food chain and name the types of food chain. [Say-2011]
Mango tree g Hen g Man g Earthworm The orderly inter-linking of organism involving the transfer of food energy from producers through a series of organism with repeated eating and being eaten is referred to as food chain. They are of two types viz Grazing food chain and Detritus food chain.
Consider pond as an ecosystem showing the number of individuals in the following categories. Carnivores – 2500, Producers -15000, Herbivores – 5000
a. Draw the pyramid of numbers in this eco-system.
b. Comment on the energy flow in the ecosystem [March -2011]
b. Energy flow is unidirectional. The amount of energy flow decreases with successive trophic level.
The gradual change in the species composition of a given area leading to the formation of climax community is called ecological succession. In a rocky area,
a. What is the expected type of pioneer species?
b. How this pioneer species leads to the establishment of a stable climax community? [March-2011]
a. Lichen, ie., crustose lichen is the pioneer species.
b. Crustose lichen stage → Foliose lichenstage → moss stage → herb stage → shrub stage → forest stage.
Forest stage is a stable climax community.
Pond is a self-sustainable unit. Some organisms related to pond ecosystem is listed below, tadpole, fish, water,plants, kingfisher.
a. Construct a foodchain with the listed organisms.
b. Explain trophic level.
c. Point out trophic level of each organism in the constructed food chain.
d. Name interconnection of food chains in nature. [Say-2010]
a. Water plants → Tad pole → Fish → King fisher.
b. Gross primary productivity – The rate of total capture of light energy, or the rate of total production of biomass.
Net primary productivity: The balance energy or biomass remaining after meeting the cost of respiration of
producers. [Net productivity = Gross productivity – respiration loss]
c. Water plants – I tropic level – producers
Tadpole – II tropic level – herbivores (primary consumer)
Fish – III tropic level-secondary consumer
Kingfisher – tropic level teretiary consumer
d. Food web.
While learning trophic levels in classroom, teacher asked you to explain ‘standing crop’ to Raman. Explain
Each tropic level has a certain mass of living material at a particular time is called standing crop.
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