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

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

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

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

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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 One Mark Questions - Part Two

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.

Questions + Answers key

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QB365 Student Learing Managemnet System

Std: 12th Standard - Biology

chapter: - Model Question paper

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Questions:

Multiple Choice Question

9 x 1 = 9

Competition between species leads to

(a)

Extinction

(b)

Mutation

(c)

Amensalism

(d)

Symbiosis

Which of the following forests is known as the lungs of the planet earth?

(a)

Tundra forest

(b)

Rain for forest of north east India

(c)

Taiga forest

(d)

Amazon rain forest

Cyclosporin – A is an immunosuppressive drug produced from _______

(a)

Aspergillus niger

(b)

Manascus purpureus

(c)

Penicillium notatum

(d)

Trichoderma polysporum

Which period was called “Age of fishes”?

(a)

Permian

(b)

Triassic

(c)

Devonian

(d)

Ordovician

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)

A	B	C	D
(iv)	(ii)	(i)	(iii)

(b)

A	B	C	D
(iv)	(i)	(iii)	(ii)

(c)

A	B	C	D
(i)	(iv)	(ii)	(iii)

(d)

A	B	C	D
(iv)	(i)	(ii)	(iii)

Meselson and Stahl’s experiment proved

(a)

Transduction

(b)

Transformation

(c)

DNA is the genetic material

(d)

Semi-conservative nature of DNA replication

Find the wrongly matched pair.

(a)

Bleeding phase- fall in oestrogen and progesterone

(b)

Follicular phase-rise in oestrogen

(c)

Luteal phase - rise in FSH level

(d)

Ovulatory phase - LH surge

Pataus syndrome is also referred to as ______.

(a)

13-Trisomy

(b)

18-Trisormy

(c)

21-Trisormy

(d)

None of these

Identify the incorrect pair

(a)

sporopollenin - exine of pollen grain

(b)

tapetum – nutritive tissue for developing microspores

(c)

Nucellus – nutritive tissue for developing embryo

(d)

obturator – directs the pollen tube into micropyle

Assertion and reason

1 x 2 = 2

10.

In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
Assertion (A): Offsprings produced by asexual reproduction are genetically identical to the parent.
Reason(R): Asexual reproduction involves only mitosis and no meiosis.
Codes:
A. If both A and R are true and R is correct explanation for A
B. If both A and R are true but R is not the correct explanation for A
C. If A is true but R is false
D. If both A and R are false.

(a)

both A and R are true and R is correct explanation for A

(b)

If both A and R are true but R is not the correct explanation for A

(c)

If A is true but R is false

(d)

If both A and R are false.