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NEET - Grade 12 - Biology - Organisms and Populations - Introduction and Snapshot of Organisms and Populations - Study ref# 974

Introduction: Our living world is fascinatingly diverse and amazingly complex. We can try to understand its complexity by investigating processes at various levels of biological organization- macromolecules, cells, tissues, organs, ind... read more

NEET - Grade 12 - Biology - Ecosystem - Introduction and Snapshot of Ecosystem - Study ref# 977

Introduction: An ecosystem can be visualized as a functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment. Ecosystem varies greatly in size from a small pond to a l... read more

NEET - Grade 12 - Biology - Ecosystem - Introduction and Snapshot of Ecosystem - Study ref# 978

Following sections must be covered to understand the Ecosystems: 1. Ecosystem- Structure and Functions 2. Productivity 3. Decomposition 4. Energy Flow 5. Ecological Pyramid 6. Ecological Succession 7. Nutrient Cycling 8.... read more

NEET - Grade 12 - Biology - Ecosystem - Target Setup for Ecosystem - Study ref# 979

Student requires to achieve the following milestones to get better grip over Ecosystem. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000%Subje... read more

NEET - Grade 11 - Chemistry - Environmental Chemistry - Study ref# 2240

What are the major causes of water pollution? Explain. Answer: Pollution of water originates from human activities. causes of water pollution are: (i) &nbs... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10406

What does ‘R’ represent in the given equation for productivity in an ecosystem? GPP—R =NPP. [R][Delhi Set-I, Comptt,2014] Answer: ‘R’ represents the loss of biomass due ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10407

Write a difference between net primary productivity. [R][Outside Delhi Set-I, 2011] Answer: Gross productivity- rate of production of organic matter during photosynthesis... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10408

Write the equation that helps deriving the net primary productivity of an ecosystem. [R][Delhi Set-I, III,2013] Answer: NPP=GPP—R Where, NPP: Ne... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10409

All primary productivity is not available to herbivore. Give one reason. [E & A][Delhi Comptt,2009] Answer: All primary productivity is not available to a herbivore ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10410

Why is a Earthworm called detrivore? [R][Delhi, 2009] Answer: Earth worms are called detrivores because they break down the detritus i.e. the de... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10411

What is secondary productivity? [A] [Foreign 2012] Answer: Secondary productivity refers to the rate of formation of new organic matter by the consumers e... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10412

Why are green plants not found beyond certain depth in ocean? [Delhi, 2011] Answer: Green algae are not found beyond a certain depth in ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10413

How are productivity, gross productivity and secondary productivity interrelated? [R][Delhi Set-I,2015] Answer: NPP=GPP—R Productivity is the rate of production of biomass at an... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10414

What does secondary productivity in an ecosystem indicate? List any two factors by which productivity is limited in an aquatic ecosystem. [R][Delhi,... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10415

How does the dad organic matter get decomposed in nature? Explain. [U][Delhi Set, Comptt,2012] Answer: In nature, the dead organic matter gets decomposed by the micro-o... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10416

Why is the earthworm considered a farmer’s friend? Explain humification and mineralization occurring in decomposition cycle. [U][Foreign 2015] Answer:... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10417

Describe how oxygen and chemical composition of detritus control decomposition? [R][Delhi 2011] Answer: Decomposition of detritus is an oxygen requiring process i.e. it takes pl... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10418

Describe the process of decomposition of detritus under the following headings: Fragmentation; leaching; catabolism; humification and mineralization. [R][Delhi Se... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10419

Taking a small pond as an example of an ecosystem, list the four components of this ecosystem. How do these components function as a unit in a small pond? [A][Delhi set-I,II,III, Comptt,2016] Answer: Four components... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10420

Citing lake as an example of a simple aquatic ecosystem, interpret how various functions of this ecosystem are carried out. Make a food chain that is functional in this ecosystem. ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10421

Define Standing Crop. [R][CBSE SQP] Answer: Each trophic level has a certain mass of living material at a particular time called as the standing crop. ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10422

‘Man is a primary as well as the secondary consumer’. Justify this statement. [U][Foreign2015] Answer: The man is a primary consumer when he eats animals. Man is in fact o... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10423

What is the starting point of a detritus food chain. [R][Delhi 2007] Answer: Detritus food Chain (DFC) start from detritus or dead and decaying organic matter i.e. dead plants and animals waste and animal faces. Detrivor... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10424

State what does ‘standing crop’ of a trophic level represents. [R][Outside Delhi, Set-III,Comptt,2013] Answer: It is the total amount of living matter or organic matter present in an eco... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10425

Why is the pyramid of energy always upright? [A][Delhi Set-I,III, ,2013] Answer: The pyramid of energ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10426

In a botanical garden of a city there is a huge banyan tree growing on which hundreds of birds and thousands of insects live. Draw the pyramids of numbers and also biomass represented by this community. Comment giving reasons on the two diff... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10427

Why are herbivore considered similar to predators in ecological context? Explain. [A][Outside Delhi, 2010] Answer: The herbivores are considered like predators in ecological contex... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10428

“In a food-chain, a trophic level represents a functional level, not a species.” Explain. [A][Delhi Set-I, 2016] Answer: Position of a species in any trophic level is determined by the funct... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10429

Name the pioneer species on a bare rock. How do help in establishing the next type of vegetation? Mention the type of climax community that will ultimately get established. [U][Delhi Set-I,II,III, 2011] Answer: Th... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10430

Explain how xerarch succession progresses from xeric condition and forms a stable climax community. You may use a flow chart. &... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10431

(i) ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10432

Explain the functions of reservoirs in a nutrient cycle. List two types of nutrient cycle in nature. [U][Outside Delhi Comptt,2010] Answer: The two types of nutrient cycles are ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10433

Global carbon is fixed in the biosphere through photosynthesis. Explain any two ways by which carbon is returned to the atmosphere. [U][Outside Delhi Comptt,2010] Answer: The ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10434

State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature. [U][Outside DelhiSet-III,2014] Answer: Function: To meet ... read more

NEET - Grade 12 - Biology - Ecosystem - Study ref# 10435

Carbon cycle in nature is a biogeochemical cycle. Explain how is it different from phosphorus cycle? OR Explain with the help of a flow chart recycling f phosphorus in nature. How s phosphorus cycle different from carbon cycle in natur... read more

NEET - Grade 12 - Biology - Biodiversity and Conservation - Study ref# 10455

Differentiate between in-situ and ex-situ approaches of conservation of biodiversity. [U][Delhi Set-II,2011] Answer: read more

NEET - Grade 12 - Biology - Biodiversity and Conservation - Study ref# 10456

Why should biodiversity be conserved? Explain giving three reasons. [U][Outside Delhi set-II, Comptt.2016] Answer: Narrowly utilitarian: Humans derive direct economic benefits from natu... read more

NEET - Grade 12 - Biology - Environmental Issues - Study ref# 10759

With the help of a flowchart exhibit the events of Eutrophication. [U][Outside Delhi Set-II, 2015] Answer: Enrichment of water body by excessive nutrients is called eutrophi... read more