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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 05/11/2020
12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Four
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.
Sudden appearance of vestigial organs in highly evolved organisms is called
Vestigial organs
Connecting link
Atavistic organs
Adaptive radiation
2.
Identify the incorrect statement
Water is a universal solvent
Water has less surface tension
Water is heavier than air
When freezes water contracts
3.
Which is not an accepted biodiversity hotspots of India?
Indian Himalayas
Western Ghats
Indo-Burma
Deccan Plateau
4.
Which blood group doesn't possess antibodies?
IAIB
IOIO
IAO
IBIB
5.
An association of individuals of different species living in the same habitat and having functional interaction is:
Biotic community
Ecosystem
Population
Ecological niche
6.
The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of
Non-recombinant bacteria containing β galactosidase.
Insertional inactivation of α-galactosidase in non-recombinant bacteria.
Insertional inactivation of α-galactosidase in recombinant bacteria.
Inactivation of glycosidase enzyme in recombinant bacteria
7.
During sewage treatment, biogas are produced which includes
Methane, hydrogen sulphide, carbon dioxide
Methane, oxygen, hydrogen sulphide
Hydrogen sulphide, methane, sulphur dioxide
Hydrogen sulphide, nitrogen, methane
8.
Mundanthurai wild life sanctuary is located in ___________ district.
Coimbatore
Tirunelveli
Kancheepuram
Nagapattinam
9.
This technique is used to diagnose the chromosomal abnormities.
Assisted Reproductive Technology (ART)
Micro Testicular Sperm Extraction
Amniocentesis
GIFT
10.
Paedogenetic parthenogenesis is seen in ______
planula larvae of enidarians
Cydippid larvae of pleurobranchia
Redia larvae of liver fluke
Trochophore larvae of Annelids
11.
External fertilization is seen is ______
Mammals and birds
Reptiles and sponges
Fishes and birds
Sponges and amphibians
12.
Statement A: Coffee contains caffeine
Statement B: Drinking coffee enhances cancer
A is correct, B is wrong
A and B – Both are correct
A is wrong, B is correct
A and B – Both are wrong
13.
Which one of the following are the species that are crossed to give sugarcane varieties with high sugar, high yield, thick stems and ability to grow in the sugarcane belt of North India?
Saccharum robustum and Saccharum officinarum
Saccharum barberi and Saccharum officinarum
Saccharum sinense and Saccharum officinarum
Saccharum barberi and Saccharum robustum
14.
The quickest method of plant breeding is _______.
Introduction
Selection
Hybridization
Mutation breeding
15.
16.
Find the wrongly matched pair.
Endemism - Species confined to a region and not found anywhere else.
Hotspots - Western Ghats
Ex-situ Conservation - Zoological parks
Sacred groves - Saintri hills of Rajasthan
Alien sp. Of India - Water hyacinth
17.
The relationship between sucker fish and shark is__________
Competition
Commensalism
Predation
Parasitism.
18.
The Hydrochlorofluorocarbons (HCFCs) are the compounds which have the following molecules:
Hydrogen
Carbon
Chlorine
Fluorine
19.
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
20.
21.
22.
If haploid number in a cell is 18. The double monosomic and trisomic number will be _____.
35 and 37
34 and 37
37 and 35
17 and 19
23.
Pure tall plants are crossed with pure dwarf plants. In the F1 generation, all plants were tall. These tall plants of F1 generation were selfed and the ratio of tall to dwarf plants obtained was 3:1. This is called ______.
Dominance
Inheritance
Codominance
Heredity
24.
In his classic experiments on Pea plants, Mendel did not use ______.
Flowering position
Seed colour
Pod length
Seed shape
25.
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
1.
(c)
Atavistic organs
2.
(b)
Water has less surface tension
3.
(d)
Deccan Plateau
4.
(a)
IAIB
5.
(a)
Biotic community
6.
(a)
Non-recombinant bacteria containing β galactosidase.
7.
(a)
Methane, hydrogen sulphide, carbon dioxide
8.
(b)
Tirunelveli
9.
(c)
Amniocentesis
10.
(c)
Redia larvae of liver fluke
11.
(d)
Sponges and amphibians
12.
(a)
A is correct, B is wrong
13.
(a)
Saccharum robustum and Saccharum officinarum
14.
(d)
Mutation breeding
15.
(c)
16.
(d)
Sacred groves - Saintri hills of Rajasthan
17.
(b)
Commensalism
18.
(c)
Chlorine
19.
(b)
Rain for forest of north east India
20.
(b)
21.
(c)
22.
(b)
34 and 37
23.
(a)
Dominance
24.
(c)
Pod length
25.
(c)
Crossing the F1 hybrid with a double recessive genotype
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