CHSE Biology MCQs For 2021 Board Exam

Part – 1: Zoology 

1)    Which one is a primary sex organ?
a)    Testis
b)    Scrotum
c)    Prostate
d)    Penis

2)    How many spermatozoa are produced by a secondary spermatocyte? 
a)    4
b)    8
c)    1
d)    2

3)    Medical termination of pregnancy (MTP) is considered safe up to how many weeks of pregnancy? 
a)    8 weeks 
b)    12 weeks 
c)    18 weeks 
d)    6 weeks 

4)    A colourblind person cannot distinguish 
a)    All colours 
b)    Red colour
c)    Green colour 
d)    Red and green colours 

5)     In birds, which type of chromosomal basis of sex determination is present? 
a)    XX – XY
b)    XX – XO
c)    ZW – ZZ
d)    ZZ – ZO

6)    In a person with Turner syndrome, the number of X chromosome is 
a)    1
b)    2
c)    3
d)    0

7)    The cancer of lymphatic system is known as ____.
a)    Sarcoma
b)    Leukemia
c)    Lymphoma 
d)    Carcinoma 

8)    Amoebiasis is caused by: 
a)    Plasmodium vivax
b)    Entamoeba gingivalis 
c)    Trypanosoma gambiense 
d)    Entamoeba histolytica 

9)    AIDS virus has 
a)    Double stranded DNA
b)    Single stranded DNA
c)    Single stranded RNA
d)    Double stranded RNA

10)    Which immunoglobulin is the largest in size?
a)    IgA
b)    IgD
c)    IgE
d)    IgM

11)    Polymerase chain reaction was discovered by:
a)    H. Khorana
b)    K. Mullis
c)    R. Holley
d)    M. Nirenberg

12)    DNA ligase is commonly known as:
a)    Molecular scissors
b)    Molecular marker
c)    Molecular glue
d)    Molecular probe

13)    The blotting of protein molecules to a nylon membrane is known as:
a)    Southern blotting
b)    Western blotting
c)    Northern blotting
d)    Eastern blotting

14)    Humulin is manufactured by 
a)    Pfizer 
b)    Hoechst
c)    Eli Lilly
d)    Aventis 

15)    The immune system which works against self is:
a)    Self immune system 
b)    Autoimmunity
c)    Specific immunity
d)    None of the above 

16)    A genetically modified crop is:
a)    Irradiated crop
b)    Transgenic crop
c)    Raised on green manure
d)    A green manure 

17)    An abnormal gene is replaced by a normal gene. It is called:
a)    Gene therapy
b)    Gene cloning
c)    Gene mutation 
d)    Gene ligation 

18)    In 28days human ovarian cycle, ovulation takes place typically on:
a)    5th day of the cycle 
b)    1st day of the cycle 
c)    14th day of the cycle 
d)    28th day of the cycle 

19)    After tubectomy which part of the female reproductive system remains blocked?
a)    Cervix
b)    Uterine 
c)    Ovary 
d)    Fallopian tube 

20)    Which organ adversely affected by alcohol?
a)    Kidney
b)    Liver
c)    Herat
d)    Lung 

For Answer See Below...

Answers:

1)    (a) testis
2)    (d) 2
3)    (b) 12 weeks
4)    (d) red and green colours
5)    (c) ZW – ZZ
6)    (a) 1
7)    (c) lymphoma
8)    (d) Entamoeba histolytica
9)    (c) single stranded RNA
10)    (d) IgM
11)    (b) K. Mullis
12)    (c) molecular glue
13)    (b) western blotting
14)    (c) Eli Lilly
15)    (b) autoimmunity
16)    (b) transgenic crop
17)    (a) gene therapy
18)    (c) 14th day of the cycle
19)    (d) fallopian tube
20)    (b) liver