cbsenet.nic.in National Eligibility Test Environmental Science Paper Model : Central Board of Secondary Education
Organisation : Central Board of Secondary Education
Exam : National Eligibility Test Environmental Science Model Paper
Document Type : Model Question Paper
Website : cbsenet.nic.in
Download Sample Question Paper : https://www.pdfquestion.in/uploads/7493-PaperIIIEnvironmental%20Science.pdf
National Eligibility Test Environmental Science Model Paper :
General Instructions :
1. Write your roll number in the space provided on the top of this page.
2. This paper consists of fifty multiple-choice type of questions.
Related : Central Board Of Secondary Education NET Drama / Theatre Model Question : www.pdfquestion.in/10820.html
3. At the commencement of examination, the question booklet will be given to you. In the first 5 minutes, you are requested to open the booklet and compulsorily examine it as below :
(i) To have access to the Question Booklet, tear off the paper seal on the edge of this cover page. Do not accept a booklet without sticker-seal and do not accept an open booklet.
(ii) Tally the number of pages and number of questions in the booklet with the information printed on the cover page. Faulty booklets due to pages/questions missing or duplicate or not in serial order or any other discrepancy should be got replaced immediately by a correct booklet from the invigilator within the period of 5 minutes. Afterwards, neither the Question Booklet will be replaced nor any extra time will be given
(iii) After this verification is over, the Test Booklet Number should be entered on the OMR Sheet and the OMR Sheet Number should be entered on this Test Booklet.
4. Each item has four alternative responses marked (1), (2), (3) and (4). You have to darken the circle as indicated below on the correct response against each item.
Example : where (3) is the correct response.
5. Your responses to the items are to be indicated in the OMR Sheet given inside the Booklet only. If you mark your response at any place other than in the circle in the OMR Sheet, it will not be evaluated.
6. Read instructions given inside carefully.
7. Rough Work is to be done in the end of this booklet.
8. If you write your Name, Roll Number, Phone Number or put any mark on any part of the OMR Sheet, except for the space allotted for the relevant entries, which may disclose your identity, or use abusive language or employ any other unfair means, such as change of response by scratching or using white fluid, you will render yourself liable to disqualification.
9. You have to return the Original OMR Sheet to the invigilators at the end of the examination compulsorily and must not carry it with you outside the Examination Hall. You are, however, allowed to carry original question booklet and duplicate copy of OMR Sheet on conclusion of examination.
10. Use only Black Ball point pen provided by C.B.S.E.
11. Use of any calculator or log table etc., is prohibited.
12. There is no negative marks for incorrect answers.
13. In case of any discrepancy in the English and Hindi versions, English version will be taken as final.
PAPER – III :
Note : This paper contains seventy five (75) objective type questions of two (2) marks each. All questions are compulsory.
1. Biological zonation in the ocean is determined by :
(I)Ocean depth
(II) Light availability
(III) Bottom substrate
Choose the correct answer :
(1) (I) only
(2) (I) and (II) only
(3) (I), (II) and (III)
(4) (II) and (III) only
2. Given below are two statements. One labeled as Assertion (A) and the other labeled as
Reason (R) : Methanogenic archae (methanogens) grow in swamps and sewage.
Assertion (A) :Methanogens are obligate anaerobes
Choose the correct answer :
(1) Both (A) and (R) are correct and (R) is the correct explanation of (A).
(2) Both (A) and (R) are correct and (R) is not the correct explanation of (A).
(3)(A) is true, but (R) is false.
(4)(A) is false, but (R) is true
3. Filamentous Cyanobacteria differentiate 5 to 10% of their vegetative cells into heterocysts.
Heterocysts are characterized by
(I) Thick cell wall
(II) Only PSI activity
(III) Nitrogenase activity
Choose the correct answer
(1) (I) only
(2) (I) and (II) only
(3) (II) and (III) only
(4) (I), (II) and (III
4. A critically endangered species
(1) Do not exist in wild habitat
(2) Face extremely high risk of extinction in immediate future
(3) Face high risk of extinction in the medium term future
(4) Will not face any risk of extinction in future 1000 years
5.Which of the following characteristics of desert animals are physiological adaptation to conserve water ?
(I)Thick outer covering
(II) Release dry faeces
(III) Avoid exposure to direct sunlight
Choose the correct answer :
(1) (I) and (III) only
(2) (II) and (III) only
(3) (I) and (II) only
(4) (I), (II) and (III)
7.Individual organism respond to environmental change through short-term adjustment(s) by
(1) Physiological changes
(2) Cytological changes
(3) Genetic changes
(4) Phytochemical and genetic alterations
8.The hurricanes have spatial scale of
(1) 100 Km – 1000 Km
(2) 10 Km – 100 Km
(3) 100 m – 100 Km
(4) 100 m – 10 Km
9. In SDS – PAGE
(1) Polymeric proteins are not only converted into monomers, but monomers are also denatured by SDS.
(2) Polymeric proteins converted into monomeric units, but monomers are not denatured.
(3) Polymeric proteins are retained as single unit.
(4) SDS donot have any negative impact on native structure of monomers.
10. Which of the following is the major source of mercury pollution in India ?
(1) Coal based thermal power plants
(2) Pesticides manufacturing
(3) Dental amalgam fillings
(4) Electrical and electronic gadgets
11. Elemental carbon influences the regional climate because :
(1) It influences the radiative flux in the atmosphere due to its absorbing properties.
(2) It reacts with other pollutants.
(3) It coagulates with other atmospheric pollutants.
(4) Its concentration is usually more in the atmosphere.
12. Bioremediation of xenobiotics (like melathion) through hydrolysis involves their detoxification by
(1) Removal of water
(2) Addition of water
(3) Both removal and addition of water
(4) Removal of phosphate
13. Biological communities in a stream vary based on
(I) Water velocity
(II) Allochthnous material
(III) Size of the particle on the stream bed
(IV) Depth of the stream
Choose the correct answer
(1) (I) and (II) only
(2) (I), (II) and (III) only
(3) (II), (III) and (IV) only
(4) (I), (II), (III) and (IV