CBSE Class 12 Biology Marking Scheme & Sample Paper 2021-22 (Term 1): Based On Revised CBSE Syllabus

Check CBSE Class 12 Biology Marking Scheme & Sample Paper 2021-22 (Term 1). This sample paper is based on the revised CBSE Syllabus 2021-22. Term 1 CBSE Class 12 Biology board exam 2021-22 is scheduled for 18 December. Download now and prepare for CBSE Class 12 Biology board exam 2021-22.

10th & 12th CBSE Term 1 Date Sheet 2021-22 (PDF): Download CBSE Time Table (Science, Commerce, Arts)

CBSE Class 12 Biology Marking Scheme & Sample Paper 2021-22 (Term 1):

Time: 90 Minutes

General Instructions:

1. The Question Paper contains three sections.

2. Section A has 24 questions. Attempt any 20 questions.

3. Section B has 24 questions. Attempt any 20 questions.

4. Section C has 12 questions. Attempt any 10 questions.

5. All questions carry equal marks.

6. There is no negative marking.

SECTION - A

Section – A consists of 24 questions. Attempt any 20 questions from this section. The first

attempted 20 questions would be evaluated.

Question 1. The structure of bilobed anther consists of

A. 2 thecae, 2 sporangia

B. 4 thecae, 4 sporangia

C. 4 thecae, 2 sporangia

D. 2 thecae, 4 sporangia

Answer:

D. 2 thecae, 4 sporangia

Question 2. 

Answer:

B. 3,3,2

3 in chalazar end 3 in the micropolar end and 2 nuclei in the center

Question 3:

The coconut water from tender coconut is

A. cellular endosperm.

B. free nuclear endosperm.

C. both cellular and nuclear endosperm.

D. free nuclear embryo

Answer:

B. Free nuclear endosperm

Question 4: 

Pollen grains are well preserved as fossils because of presence of

A. sporopollenin

B. cellulose

C. lignocellulose

D. pectocellulose

Answer:

A. sporopollenin

Question 5:

Answer:

B. ii, iii 

Question 6: Which of the following statements are correct with respect to hormones secreted by placenta?

(i) Placenta secretes relaxin during later stage of pregnancy.

(ii) Placenta secretes high amount of FSH during pregnancy.

(iii) Placenta secretes relaxin during initial stage of pregnancy.

(iv) Placenta secretes hCG and hPL during pregnancy.

A. (i) and (iv)

B. (i), (ii) and (iv)

C. (iii) and (iv)

D. (ii), (iii) and (iv)

Answer:

A) (i) and (iv)

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For rest of the questions and answers, download sample paper and marking scheme from the following link

CBSE Class 12 Biology Sample Paper 2021-22 Term 1 (PDF)

CBSE Class 12 Biology Marking Scheme 2021-22 Term 1 (PDF)