Download App

Biodiversity and Conservation — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYBiodiversity and Conservation5 Marks
Question
What is an ecosystem service? List any four important ecosystem services provided by the natural ecosystems. Are you in favour or against levying a charge on the service provided by the ecosystem?
✓

Answer

The product of ecosystem processes is called ecosystem service.
Following is the list of four important ecosystem services:
  1. Purification of air and water
  2. Rainfall
  3. Pollination of crops
  4. Assimilation of excess carbon
There should be no charge for ecosystem services because nature provides everything for free. However, there should be proper attempts to estimate the cost of these services. Data about costs of these services should be made available to the general public. Every person should be educated about the real value of ecosystem services. This will help us in appreciating the real value of services which we get from the ecosystem.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Biodiversity and Conservation→Biodiversity and Conservation — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

A pea plant bearing axial flowers is crossed with a pea plant bearing terminal flowers. The cross is carried out to find the genotype of the pea plant bearing axial flowers. Work out the cross to show the conclusions you arrive at.
→
State the Mendelian principle which can be derived from such a cross and not from monohybrid cross.
→
  1. With labelled diagrams, depict the stages in embryo development in a dicotyledonous plant.
  2. Endosperm development precedes embryo development. Why?
→
If a desired gene is identified in an organism for some experiments, explain the process of the following:
  1. Cutting this desired gene at specific location.
  2. Synthesis of multiple copies of this desired gene.
→
  1. Explain the role of regulatory gene, operator, promoter and structural genes in lac operon, when E.coli is growing in a culture medium with the source of energy as lactose.
  2. Mention what would happen, if lactose is withdrawn from the culture medium.
OR
Describe how the lac operon operates both in the presence and absence of an inducer in E.coli.
→
  1. List any four evidences of evolution.
  2. Explain any one of the evidences that helps to understand the concept of evolution.
→
Provide genetic explanation for the observation in which the flower colour in $F_1$ generation of snapdragon did not resemble either of the two parents. However, the parental characters reappeared when $F_1$ progenies were selfed.
→
  1. Explain with the help of Griffith’s experiment how the search for genetic material was conducted and what was the conclusion drawn?
  2. How did MacLeod, McCarty and Avery establish the biochemical nature of the so called ‘genetic material’ identified by Griffith in his experiment.
→
Describe the process of decomposition of detritus under the following heads: Fragmentation; leaching; catabolism; humification andmineralisation.
→
A flower of tomato plant following the process of sexual reproduction produce 240 viable seeds.
Answer the following questions giving reasons:
What is the minimum number of pollen grains that must have been involved in the pollination of its pistil?
→