12th Standard Syllabus & Materials
12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set C
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set B
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set A
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set C
Published on: 05/11/2020
12th Standard Zoology English Medium Free Online Test One Mark Questions with Answer Key 2020
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
Which of the following sequence has completely translated?
(i) AGA, UUU, UGU, AGU, UAG
(ii) AUG, UUU, AGA, UAC, UAA
(iii) AAA, UUU, UUG, UGU, UGA
(iv) AUG, AAU, AAC, UAU, UAG
i and ii
ii only
i and iii
ii and iv
2.
Assertion (A): On diagnosis, Ramu is reported to have underdeveloped testis and gynaecomastia.
Reason (R): His karyotype reveals XXY condition
A is right but R is wrong
R explains A
Both A and R are wrong
Both and R are right but R is not the correct explanation of A
3.
Which is not a correct statement regarding Oogenesis?
(i) During foetal development, cells in germinal epithelium of foetal ovary undergo mitosis and produce oogonia.
(ii) Oogonial cell divide and enter into prophase I of meiosis I and from primary oocytes.
(iii) Primary oocytes later develop into primary follicles.
(iv) No oogonia is formed or added after the foetal birth.
Only i
ii and iii
iv only
None of the above
4.
_________________ era is called age of mammals
Precambrian
Permian
Cenozoic
Paleozoic
5.
______ is observed as world population day
11th June
11th April
11th July
11th May
6.
The _____ contractions lead to false labour pains.
Let - Down reflex
Ferguson reflex
Foetal ejection reflex
Braxter - Hicks
7.
_____ may be due to cancer of the ovary.
Amenorrhoea
Dysmenorrhoea
Menorrhagia
Oligomenorrhoea
8.
There are no tRNA, for _______ codons.
AUG
GUC
UAA
AGA
9.
Regeneration was first studied by _______
A.G. Tansley
Charles Bonnet
Abraham Trembley
Walter Gilbert
10.
Vector control research Centre is located in__________
Chennai
Delhi
Puducherry
Hyderabad
11.
During favourable conditions ______ shows multiple fission.
Plasmodium
Amoeba
Planaria
Euglena
12.
X chromosomes was discovered by _________.
Landsteiner
Henking
Stevens
Bridges
13.
Transgenic animals are those which have
Foreign DNA in some of their cells
Foreign DNA in all their cells
Foreign RNA in some of their cells
Foreign RNA in all their cells
14.
Who introduced the term biodiversity?
Edward Wilson
Walter Rosen
Norman Myers
Alice Norman
15.
Who proposed the Germplasm theory?
Darwin
August Weismann
Lamarck
Alfred Wallace
16.
A contraceptive pill prevents ovulation by ______.
blocking fallopian tube
inhibiting release of FSH and LH
stimulating release of FSH and LH
causing immediate degeneration of released ovum.
17.
What is the basis for the difference in the synthesis of the leading and lagging strand of DNA molecules?
Origin of replication occurs only at the 5' end of the molecules
DNA ligase works only in the 3' → 5' direction
DNA polymerase can join new nucleotides only to the 3' end of the growing stand.
Helicases and single-strand binding proteins that work at the 5' end
18.
Mammalian egg is ______.
Mesolecithal and non cleidoic
Microlecithal and non cleidoic
Alecithal and non cleidoic
Alecithal and cleidoic
19.
Choose the correctly match pair.
Amphetamines - Stimulant
LSD - Narcotic
Heroin - Psychotropic
Benzodiazepine - Pain killer
20.
What can be the blood group of offspring when both parents have AB blood group?
AB only
A, B and AB
A, B, AB and O
A and B only
1.
(d)
ii and iv
2.
(b)
R explains A
3.
(d)
None of the above
4.
(c)
Cenozoic
5.
(c)
11th July
6.
(d)
Braxter - Hicks
7.
(c)
Menorrhagia
8.
(c)
UAA
9.
(c)
Abraham Trembley
10.
(c)
Puducherry
11.
(b)
Amoeba
12.
(b)
Henking
13.
(b)
Foreign DNA in all their cells
14.
(b)
Walter Rosen
15.
(b)
August Weismann
16.
(b)
inhibiting release of FSH and LH
17.
(c)
DNA polymerase can join new nucleotides only to the 3' end of the growing stand.
18.
(c)
Alecithal and non cleidoic
19.
(a)
Amphetamines - Stimulant
20.
(b)
A, B and AB
12th Standard Syllabus & Materials
12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set B
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set A
NEW12th Standard
TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set C
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