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Published on: 05/11/2020
12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Ten
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.
If a recessive gene is involved in cousin genetic disease, what is the strategy to be in gene therapy in order to cure the disease
Injecting DNA into the genome
Injecting DNA and antisense gene
Injecting antisense gene
Removal of recessive gene
2.
Find the odd sentence out.
(i) Biogas primarily consists of methane with CO2 and hydrogen
(ii) The greater the BOD of wastewater the more its polluting potential
(iii) World biofuel day is observed on 10th August
(iv) Cyclosporin A is obtained from Trichoderma polysporum.
i and iii
ii and iv
i and iv
none of the above
3.
The B-chain of Insulin is composed of ________ amino acids
70
30
45
60
4.
Which of the following statement(s) is true regarding cancer cells?
(a) Neoplasm or tumor cells show uncontrolled growth
(b) They are metastatic
(c) They lack contact inhibition
(d) They may be benign or malignant
(a) only
(b) and (c)
(d) only
All the above
5.
Identify the non-fungal species used in SCP production.
(i) Candida
(ii) Chlorella
(iii) Chlamydomonas
(iv) Cellulomonas
i and ii
ii and iii
ii, iii and iv
All the above
6.
Read the statement and select the correct terminology for the same:
"Carrying away of inorganic compounds of soil by water".
Eluviation
Fragmentation
Humification
Mineralisation
7.
The term used to define the ability of a cell to generate entire individual is
Pluripotent
Totipotent
Multipotent
Unipotent
8.
A lake which is rich in organic waste may result in
Drying of the lake due to algal bloom
Increased population of fish due to lots of nutrients
Mortality of fish due to lack of oxygen
Increases population of aquatic organisms due to minerals
9.
A biologist studies the population of eats in a barn. He found that the average natality was 250, average mortality is 240, immigration is 20 and emigration to be 30. The in population is
10
15
05
Zero
10.
Study the four statements (A to D) given below and select the two correct ones out of them.
A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.
B) Predator starfish Pisaster helps in maintaining species diversity of some invertebrates.
C) Predators ultimately lead to the extinction of prey species.
D) Production of chemicals such as nicotine, strychnine by the plants is disordered.
The two correct statements are
(B) and (C)
(C) and (D)
(A) and (D)
(A) and (B)
11.
Read the following four statements (A to D) about certain mistakes in two of them.
a) The first transgenic buffalo, Rosie produced milk which was human alpha-lactalbumin enriched.
b) Restriction enzymes are used in isolation of DNA from other macromolecules.
c) Downstream processing is one of the steps of rDNA technology
d) Disarmed pathogen vectors are also used in transfer of rDNA into the host.
Which of the two statements have mistakes?
B and C
C and D
A and C
A and B
12.
Which of the following are likely to be present in deep-sea water?
Archaebacteria
Eubacteria
Blue-green algae
Saprophytic fungi
13.
A few statements with regard to sexual reproduction are given below:
i. Sexual reproduction does not always require two individuals
ii. Sexual reproduction generally involves gametic fusion
iii. Meiosis never occurs during sexual reproduction
iv. External fertilization is a rule during sexual reproduction
Choose the correct statements from the options below:
i and iv
i and ii
ii and iii
i and iv
14.
Most popular sources of stem cells from their bank
amniotic cell bank
cord blood bank
plancenta blood bank
amniotic fluid cell bank
15.
Which statement is wrong regarding the malaria?
In the human liver, the sporozoites undergo sexual fission
Erythrocytes lyse and release the merozoites and haemozoin
In the mosquito's gut, the ookinete is formed
Male and female gametes develop in the body of a mosquito.
16.
All the following animals are continuous breeders, except.
Frogs
Honey bees
Poultry
Rabbit
17.
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
18.
Which of the following forests is known as the lungs of the planet earth?
Tundra forest
Rain for forest of north east India
Taiga forest
Amazon rain forest
19.
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.
20.
21.
Mammalian egg is ______.
Mesolecithal and non cleidoic
Microlecithal and non cleidoic
Alecithal and non cleidoic
Alecithal and cleidoic
22.
The sporozoite of the malarial parasite is present in ______
saliva of infected female Anopheles mosquito
RBC of human suffering from malaria.
Spleen of infected humans
Gut of female Anopheles mosquito
23.
Test cross involves ____.
Crossing between two genotypes with recessive trait
Crossing between two F1 hybrids
Crossing the F1 hybrid with a double recessive genotype
Crossing between two genotypes with dominant trait
24.
Arrange the layers of anther wall from locus to periphery
Epidermis, middle layers, tapetum, endothecium
Tapetum, middle layers, epidermis, endothecium
Endothecium, epidermis, middle layers, tapetum
Tapetum, middle layers endothecium epidermis
1.
(a)
Injecting DNA into the genome
2.
(d)
none of the above
3.
(b)
30
4.
(d)
All the above
5.
(c)
ii, iii and iv
6.
(a)
Eluviation
7.
(b)
Totipotent
8.
(c)
Mortality of fish due to lack of oxygen
9.
(d)
Zero
10.
(d)
(A) and (B)
11.
(d)
A and B
12.
(a)
Archaebacteria
13.
(d)
i and iv
14.
(b)
cord blood bank
15.
(a)
In the human liver, the sporozoites undergo sexual fission
16.
(a)
Frogs
17.
(b)
Foreign DNA in all their cells
18.
(b)
Rain for forest of north east India
19.
(b)
inhibiting release of FSH and LH
20.
(d)
21.
(c)
Alecithal and non cleidoic
22.
(a)
saliva of infected female Anopheles mosquito
23.
(c)
Crossing the F1 hybrid with a double recessive genotype
24.
(d)
Tapetum, middle layers endothecium epidermis
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Computer Applications

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