12th Standard Syllabus & Materials

12th Standard

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

NEW

12th Standard

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

NEW

12th Standard

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

NEW

12th Standard

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

NEW

12th Standard

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

NEW

12th Standard

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

12th Standard Biology English Medium Free Online Test Creative 1 Mark Questions

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

Take MCQ Biology Test

QB365 Student Learing Managemnet System

Std: 12th Standard - Biology

chapter: - Model Question paper

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Multiple Choice Question

9 x 1 = 9

Identify the proper dominance hierarchy.

(a)

I^A=I^O>I^B

(b)

I^A=I^B>O

(c)

I^O=I^B>I^A

(d)

I^B=I^A>O

Darwin's finches in Galapagos islands and Australian Marsupials are the example of

(a)

Industrial mechanism

(b)

Reproductive isolation

(c)

Genetic recombination

(d)

Adaptive recombination

Origin of egg laying mammal a occurred in ___________ period.

(a)

Jurassic

(b)

Carboniferous

(c)

Triassic

(d)

Cretaceous

Testosterone is secreted by ____

(a)

spermatocytes

(b)

sperm

(c)

polar bodies

(d)

leydig cells

Wobble hypothesis ________.

(a)

proves that many tRNAs are needed to transport specific amino acids

(b)

proves that the bases in tRNA need not match with mRNA

(c)

helps in economic usage of tRNA

(d)

proves that one tRNA can carry many amino acids

Chromosomes were first observed by ________.

(a)

Miescher

(b)

Hofmeister

(c)

Avery

(d)

Griffith

During favourable conditions ______ shows multiple fission.

(a)

Plasmodium

(b)

Amoeba

(c)

Planaria

(d)

Euglena

In gypsy moth we find _________ type of sex determination.

(a)

ZW - ZZ

(b)

XX - XY

(c)

XX - XO

(d)

ZO - ZZ

The ZW - ZZ type of sex determination is seen ________.

(a)

Butterflies

(b)

Drosophila

(c)

Gypsy moth

(d)

Human being

Assertion and reason

1 x 2 = 2

10.

Assertion (A): IUD's are inserted in the ovary.
Reason (R): IUD's Increases phagocytosis of the sperm.
Codes:
(a) Both A and R are correct
(b) Both A and R are incorrect
(c) A is correct R is incorrect
(d) A is incorrect R is correct

(a)

Both A and R are correct

(b)

Both A and R are incorrect

(c)

A is correct R is incorrect

(d)

A is incorrect R is correct