NEET UG Botany — Ecosystem previous year questions with solutions.
Identify the possible link A in the following food chain Green plant $\rightarrow$ Insect $\rightarrow$ Frog $\rightarrow$ A $\rightarrow$ Eagle
The upright pyramid of number is absent in
Identify the likely organisms (I, II) (III) and (IV) in the food web shown below  
Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels? 
The rate of formation of new organic matter by rabbit in a grassland, is called
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
Eutrophication is often seen in
The breakdown of detritus into smaller particles by earthworm is a process called
Of the total incident solar radiation the proportion of PAR is
Mass of living matter at a trophic level in an area at any time is called
Which one of the following statements is correct for secondary succession?
What type of human population is represented by the following age pyramid? 
A renewable exhaustible natural resource is
The biomass available for consumption by the herbivores and the decomposers is called
Which of the following representations shows the pyramid of numbers in a forest ecosystem?    
The correct sequence of plants in a hydrosere is
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem ?
Which one of the following types organisms occupy more than one trophic level in a pond ecosystem ?
Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of :
Reduction in vascular tíssue, mechanical tissue and cuticle is characteristic of
Consider the following statements concerning food chains (a) Removal of $80 \%$ tigers from an area resulted in greatly increased growth of vegetation (b) Removal of most of the carnivores resulted in an increased population of deers (c) The length of food chains is generally limited to 3-4 trophic levels due to energy loss (d) The length of food chains may vary from 2 to 8 trophic levels. Which two of the above statements are correct?
About $70 \%$ of total global carbon is found in
Consider the following statements concerning food chains A. removal of $80 \%$ tigers from an area resulted in greatly increased growth of vegetation B. removal of most of the carnivores resulted in an increased population of deers C. the length of food chains is generally limited to 3-4 trophic levels due to energy loss D. the length of food chains may vary from 2 to 8 trophic levels Which two of the above statements are correct?
A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this (1) Lots of urea and phosphate fertilizer were used in the crops in the vicinity. (2) The area was sprayed with DDT by an aircraft. (3) The lake water turned green and stinky. (4) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which two of above were the main causes of fish mortality in the lake?