Download App

Biodiversity, Conservation and Environmental Issues — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYBiodiversity, Conservation and Environmental Issues5 Marks
Question
Over-exploitation.
✓

Answer

  1. Humans have exploited natural resources beyond their needs.
  2. The excessive consumption and accumulation have resulted into problem of over¬exploitation.
  3. Overexploitation of resources has caused threats to various organisms.
  4. Dodo bird, stellar sea cow and passenger pigeon are extinct due to overexploitation.
  5. Over exploitation of fish from sea has also resulted into dearth of fish.

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 "Answer the following questions in detail." from Biodiversity, Conservation and Environmental Issues→Biodiversity, Conservation and Environmental Issues — all question types→BIOLOGY STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Homo erectus.
→
What is mutualism? Describe any four examples.
→
In a field of sugarcane, all the plants have been damaged during an epidemic of a fungal disease, whereas, in another field in the same area, there were many plants that were not affected by the disease.
  1. Explain the reason for this observation.
  2. An expert explains to the farmer, how the unaffected plants can be used to increase their number. Can you enumerate them?
  3. Is there any method to recover disease-free plant from diseased ones.
  4. What values are shown by the expert?
→
  1. Draw a sectional view of a seminiferous tubule of human. Label Sertoli cell, spermatogonia and Leydig cell on it and write their functions.
  2. Explain the role of pituitary and sex hormones in the process of spermatogenesis.
→
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.
→
Define aneuploidy. How is it different from polyploidy? Describe the individuals having following chromosomal abnormalities.
  1. Trisomy of 21st Chromosome.
  2. XXY.
  3. XO.
→

Describe Griffith’s transformation experiment.
OR
In the light of Griffith’s experiment, explain the action of two strains of streptococcus pneumoniae and give his conclusion.

→
Enlist different types of restriction enzymes commonly used in r-DNA technology? Write on their role.
→
During the explanation of the significance of several breeding techniques, teacher makes a statement about inbreeding depression and suggested a solution for it. Pallavi became very curious about knowing all this and asked certain questions to his teacher.
  1. Why is breeding required?
  2. What is the significance of improved variety?
  3. What is interspecific hybridisation?
  4. What values are shown by Pallavi as a science student?
→
With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
→