Cbse class12 biology model questions 2018
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Complete CBSE Class 12 Biology Sample Paper: 2018 is given below
Time allowed: 3hrs. Maximum Marks: 70
General Instructions:
1. There are a total of 26 questions and five sections in the question paper. All questions are compulsory.
2. Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
3. Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
4. Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
5. Section D contains question number 23, Value Based Question of four marks.
6. Section E contains question number 24 to 26, Long Answer type questions of five marks each.
7. There is no overall choice in the question paper, however, an internal choice is provided in one question of two marks, one question of three marks and all three questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
Section – A
Question1. A tissue, of a tobacco plant, infected with TMV was used to obtain a new plant.
Identify the technique used and reason out the possibility of obtaining a new healthy plant.
(1)
CBSE Class 12 Biology Syllabus 2017 - 2018
Question2. State a method of cellular defense which works in all eukaryotic organisms (1)
Question3. In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Which kind of ART is suitable in this situation to form an embryo in the laboratory conditions, without involving a donor? (1)
Question4. Write the two components of the first artificial recombinant DNA molecule constructed by Cohen and Boyer. (1)
Question5. A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters. Name the type of cross. (1)
Section B
Question6. The alarming population growth is leading to scarcity of basic requirements.
Suggest with reasons, any two population control measures other than contraception to address the situation. (2)
Question7. During a cytological study conducted on the chromosomes of the insects, it was observed that only 50% of the sperms had a specific structure after spermatogenesis. Name the structure and write its significance in sex determination of insects. (2)
Question8. To reduce the percentage of population suffering from hunger and malnutrition, microbes are grown on a large scale to act as food supplements. Mention any two microbes used as food supplement and suggest their role. (2)
OR
Time allowed: 3hrs. Maximum Marks: 70
General Instructions:
1. There are a total of 26 questions and five sections in the question paper. All questions are compulsory.
2. Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
3. Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
4. Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
5. Section D contains question number 23, Value Based Question of four marks.
6. Section E contains question number 24 to 26, Long Answer type questions of five marks each.
7. There is no overall choice in the question paper, however, an internal choice is provided in one question of two marks, one question of three marks and all three questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
Section – A
Question1. A tissue, of a tobacco plant, infected with TMV was used to obtain a new plant.
Identify the technique used and reason out the possibility of obtaining a new healthy plant.
(1)
CBSE Class 12 Biology Syllabus 2017 - 2018
Question2. State a method of cellular defense which works in all eukaryotic organisms (1)
Question3. In case of an infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Which kind of ART is suitable in this situation to form an embryo in the laboratory conditions, without involving a donor? (1)
Question4. Write the two components of the first artificial recombinant DNA molecule constructed by Cohen and Boyer. (1)
Question5. A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters. Name the type of cross. (1)
Section B
Question6. The alarming population growth is leading to scarcity of basic requirements.
Suggest with reasons, any two population control measures other than contraception to address the situation. (2)
Question7. During a cytological study conducted on the chromosomes of the insects, it was observed that only 50% of the sperms had a specific structure after spermatogenesis. Name the structure and write its significance in sex determination of insects. (2)
Question8. To reduce the percentage of population suffering from hunger and malnutrition, microbes are grown on a large scale to act as food supplements. Mention any two microbes used as food supplement and suggest their role. (2)
OR
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