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TN 12th Computer Applications மின்னணு தரவு பரிமாற்றம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிக பாதுகாப்பு அமைப்புகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின்னணு செலுத்தல் முறைகள் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications மின் - வணிகம் Sample Question Papers Study Material - QB365 Set A

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12th Standard

TN 12th Computer Applications திறந்த மூல கருத்துருக்கள் Sample Question Papers Study Material - QB365 Set A

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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A

12th Standard Biology English Medium Free Online Test Book Back 1 Mark Questions with Answer Key

Published on: 05/11/2020

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.

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Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

9 x 1 = 9

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?

(a)

Ammonia

(b)

Methane

(c)

Nitrous oxide

(d)

Ozone

Profundal zone is predominated by heterotrophs in a pond ecosystem, because of ______.

(a)

with effective light penetration

(b)

no effective light penetration

(c)

complete absence of light

(d)

a and b

Pedogenesis refers to _____.

(a)

Fossils

(b)

Water

(c)

Population

(d)

Soil

In soil water available for plants is ____.

(a)

gravitational water

(b)

chemically bound water

(c)

capillary water

(d)

hygroscopic water

Which among the following awards instituted by the Government of India for individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting Wildlife?

(a)

Indira Gandhi Paryavaran Puraskar

(b)

Medini Puruskar Yojana

(c)

Amrita Devi Bishnoi Award

(d)

Pitambar Pant National Award

Darwin’s finches are an excellent example of

(a)

connecting links

(b)

seasonal migration

(c)

adaptive radiation

(d)

parasitism

Which of the following one is used as a Biosensors?

(a)

Electrophoresis

(b)

Bioreactors

(c)

Vectors

(d)

Electroporation

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 ______.

(a)

Dominance

(b)

Inheritance

(c)

Codominance

(d)

Heredity

Identify the incorrect pair

(a)

sporopollenin - exine of pollen grain

(b)