CBSE Class 12 Biology Environmental Issues Worksheet Set A

CBSE Class 12 Biology Environmental Issues (1). CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers. 

ONE MARK QUESTION

1 BOD of two samples of water A and B were 120mg/L and 400mg/L respectively. Which sample is more polluted?

2 Name the world’s most problematic aquatic weed. What is the nature of the water body in which the weeds grow abundantly?

3 Between amphibians and birds, which will be able to cope with global warming? Give reason.

TWO MARK QUESTIONS

6 It has been recorded that the temperature of the earth’s atmosphere has increased by 0.6oC.

a) What has caused this increase?

b) Explain its consequences.

7 DDT content in the water of a lake that supplies drinking water to the near by villages, is found to be 0.003ppm.The kingfishers of that area are reported to have 2ppm of DDT. Why has the concentration increased in these birds? What harm will this cause to the bird population? Name the phenomenon.

8 How do automobiles fitted with catalytic converters reduce air pollution? Suggest the best fuel for such vehicles.

9 Explain accelerated eutrophication. Mention any two consequences of this phenomenon.

10 A crane has DDT level as 5ppm in its body. What would happen to the population of such bird? Explain giving reasons. 

11 Explain the causes of algal bloom in a water body. How does it affect an ecosystem?

3 MARK QUESTIONS

12 A factory drains its waste water into the nearby lake. It has caused algal bloom. a) How was the algal bloom caused? b) What would be the consequences? c) Name the phenomenon that caused it. 

14 Explain the causes of global warming. Why is it a warning to mankind?

15 Explain any three measures which will control vehicular air pollution in Indian cities.

16 Particulate and gaseous pollutants along with harmless gases are released from the thermal power plants.

i) Name any two harmless gases released.

ii) Name the most widely used device of removing particulate pollutants from the air. Explain how the device is used.

Please click the link below to download full pdf file for CBSE Class 12 Biology Environmental Issues (1).

Tags: 

 


Click to View or Download pdf file
Click for more Biology Study Material

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Board Cancelled Official CBSE Statement

Keeping in view the requests received from various State Governments and the changed circumstances as on date, following has been decided- 1. Examinations for classes X and XII which were scheduled from 1st July to 15th, 2020 stand cancelled. 2. Assessment of the...

Class 12 Board Exams Datesheet Announced

CBSE has announced the datesheet of the remaining class 12 board exams, see below:  

CBSE Decision on Board Exam 2020

The Class 10 and 12 exams are cancelled, and results for both 10th and 12th would be declared by July 15 based on internal exams. CBSE Class 12 students would have the option to appear for the exams at a later date. CBSE has a scheme in which marks scored in past 3...

CBSE Boards Paper Checking to Start

As per the announcement recently released by the Ministry of Home Affairs, at least 3000 CBSE affiliated selected as evaluation centers for board exam answer sheets will be allowed to open for the limited purpose of evaluation purposes only. The answer sheets for Board...

CBSE Online Training for Teachers 2020

It is clear that this pandemic has utterly disrupted an education system that many assert was already losing its relevance. Enhancing professional development digitally is a need in the times of COVID-19, where social distancing and remote interactions is the new...

Checking of Boards Answer sheets starts today

CBSE has instructed almost 3000 schools to start the evaluation work for class 10th and class 12th board exam answer sheets from today. The checking of answer sheets for class 10th and class 12th was stopped earlier due to covid crisis in the country. Now in order to...

×
Studies Today