12th Standard Syllabus & Materials
12th Standard
TN 12th English Poem - 6 - Incident of the French Camp Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 6 - On the Rule of the Road Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 5 - The Chair Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Supplementary - 4 - The Midnight Visitor Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Poem - 4 - Ulysses Sample Question Papers Study Material - QB365 Set A
NEW12th Standard
TN 12th English Prose - 4 - The Summit Sample Question Papers Study Material - QB365 Set A
Published on: 05/11/2020
12th Standard Biology English Medium Free Online Test 1 Mark Questions 2020 - Part Seven
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.
Calculate the allelic frequency of Aa, if 'A' allelic has frequency of 0.3 and 'a' allele has frequency of 0.7
0.67
0.42
0.36
0.59
2.
Which of the following contributes to the seminal plasma?
(i) Cowper's gland
(ii) Seminal vesicles
(iii) Prostate gland
(iv) Bulbourethral gland
ii, iii and ii
i, ii, and iii
i, iii and iv
all the above
3.
Which one of the following pairs of codons is correctly matched with their function or the single for the particular amino acid?
GUU, GCU - Alanine
UAG, UGA - Stop codon
AUG, ACG - start/methionine
UUA, UCA - Leucine
4.
A pleiotropic gene:
Is a gene evolved during Pliocene
Controls a trait only in combination with another gene
Controls multiple traits in an individual
Is expressed only in primitive plants
5.
Theory of chemical evolution was proposed by ___________________
Stanley
Urey
Lamarck
Wiessmann
6.
Oral contraceptive pills contain synthetic ____ and hormones. (or) Contraceptive pills contain:
androgen and testosterone
Androgen and Oxytocin
relaxin and inhibin
Progesterone and estrogen
7.
Homo sapiens or modern human arose in _____________
Australia
Africa
Germany
Eurasia
8.
The solar system is estimated to be ______years old.
4.5 billion years
4 billion years
4.5 billion years
6.4 billion years
9.
____ vaccination of girls between 9-13 years can prevent cervical cancer.
HIV
HPV
MMR
HBV
10.
The foetal ejection reflex is also called ____ reflex.
Ferguson
Let - Down
Braxter - Hicks
Parturition
11.
The spermatids are transformed into mature sperms by a process called ______
spermiation
spermiogenesis
gametogenesis
oogenesis
12.
Mode of infection of cholera is__________
Droplet infection
through contaminated food and water
through wound infection
through wound infection
13.
_______is unique for DNA.
Adenine
Uracil
Guanine
Thymine
14.
__________ is a disease where abnormal haemoglobin is produced in patients.
Phenylketonuria
Huntington's chorea
Thalassemia
Albinism
15.
16.
Match the following and choose the correct combination from the options given below.
| Column I | Column II |
| A. Mutalism | 1. Lion and deer |
| B. Commensalism | 2. Round worm and man |
| C. Parasitism | 3. Birds compete with squirrels for nuts |
| D. Competition | 4. Sea anemone on hermit crab |
| E. Predation | 5. Barnacles attached to Whales. |
A- 4, B-5, C-2, D –3, E-1
A- 3, B-1, C-4, D – 2, E-5
A- 2, B-3, C-1, D – 5, E-4
A- 5, B-4, C-2, D – 3, E-1
17.
In the E- waste generated by the Mobile Phones, which among the following metal is most abundant?
Copper
Silver
Palladium
Gold
18.
Which of the following bacteria is used extensively as a bio-pesticide?
Bacillus thurigiensis
Bacillus subtilis
Lactobacillus acidophilus
Streptococcus lactis
19.
Who introduced the term biodiversity?
Edward Wilson
Walter Rosen
Norman Myers
Alice Norman
20.
Evolutionary history of an organism is called
Ancestry
ontogeny
phylogeny
paleontology
21.
Match column I with column II and select the correct option from the codes given below.
| Column I | Column II |
| A. Copper releasing IUD | (i) LNG-20 |
| B. Hormone releasing | (ii) Lippes loop IUD |
| C. Non medicated IUD | (iii) Saheli |
| D. Mini pills | (iv) Multiload-375 |
| A | B | C | D |
| (iv) | (ii) | (i) | (iii) |
| A | B | C | D |
| (iv) | (i) | (iii) | (ii) |
| A | B | C | D |
| (i) | (iv) | (ii) | (iii) |
| A | B | C | D |
| (iv) | (i) | (ii) | (iii) |
22.
23.
The male homologue of the female clitoris is ______.
Scrotum
Penis
Urethra
Testis
24.
The _______deals with the control of several inherited human diseases especially inborn errors of metabolism
Euphenics
Eugenics
Euthenics
All of these
25.
The scar left by funiculus in the seed is _______.
tegmen
radicle
epicotyl
hilum
1.
(b)
0.42
2.
(d)
all the above
3.
(b)
UAG, UGA - Stop codon
4.
(c)
Controls multiple traits in an individual
5.
(b)
Urey
6.
(d)
Progesterone and estrogen
7.
(b)
Africa
8.
(a)
4.5 billion years
9.
(b)
HPV
10.
(a)
Ferguson
11.
(b)
spermiogenesis
12.
(a)
Droplet infection
13.
(a)
Adenine
14.
(c)
Thalassemia
15.
(c)
16.
(a)
A- 4, B-5, C-2, D –3, E-1
17.
(a)
Copper
18.
(a)
Bacillus thurigiensis
19.
(b)
Walter Rosen
20.
(a)
Ancestry
21.
(d)
| A | B | C | D |
| (iv) | (i) | (ii) | (iii) |
22.
(d)
23.
(b)
Penis
24.
(a)
Euphenics
25.
(d)
hilum
12th Standard Syllabus & Materials
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