CBSE Class 12 Biology Sample Paper 2020 Solved Set B

CBSE Class 12 Biology Sample Paper 2020 Solved Set B. 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. 

SECTION A

1 The hilly areas in kerala, Karnatka and Tamil Nadu are transformed into blue stretches due to mass flowering of a plant. Name the plant.

2 The gene I that controls ABO blood grouping in human beings has three alleles IA , IBand .How many genotypes are likely to be present in human population?

Also, how many phenotypes are possibly present?

3 In case of infertile couple, the male partner can inseminate normally but the mobility of sperms is below 40 percent. Judge which kind of ART is suited in this situation to form an embryo in the laboratory, without involving a donor?

4 Why hnRNA is required to undergo splicing? 

5 “Sweet potatoes tubers and potato tubers are the result of convergent evolution”. Justify the statement.

SECTION B

6 (a) If one can induce parthenocarpy through application of growth substances, which fruits would you select to induce parthenocarpy and why?

(b)What is the difference between parthenocarpic fruits and false fruits?

7 All reproductive tract infections (RTIs) are STDs, but all STD are not RTIs. Comment.

OR

Why tender coconut is considered a healthy source of nutrition?

How are pea seeds different from castor seeds with respect to endosperm?

8 (a)State the function of mast cells in allergy response?

(b)Name any two techniques that serve the purpose of early diagnosis of some bacterial/viral human diseases.

9 Mention the target cells of luteinsing hormone in human males and females. Explain the effects and changes which the hormone induces in each case.

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