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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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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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12th Standard Zoology - Organisms and Population English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

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

10 x 1 = 10

As altitude increases _____________

(a)

O₂ density increases

(b)

Precipitation decreases

(c)

Temperature increases

(d)

Snowing decreases

Assertion (A): Movement of organism from one place to another and back is called migration.
Reason (R): Eel is an example for anadromous migration.

(a)

Both A and R are correct R explain A

(b)

A is correct R is incorrect

(c)

R does not explain A

(d)

Both A and R are incorrect

Functional status of an organism in its community is _______________

(a)

Biome

(b)

Niche

(c)

Species

(d)

Population

People who have migrated from the planes to an area adjoining Rohtang Pass about six months back

(a)

Have more RBC's and their haemoglobin has a lower binding affinity to O₂

(b)

Are not physically fit to play games like football

(c)

Suffer from altitude sickness with symptoms like nausea, fatigue, etc.

(d)

Have the usual RBC count but then haemoglobin has very high binding affinity to O₂.

Which two of the following changes (A to D) usually tend to occur in the plain dwellers when they move to high altitudes (3500 m or more)?
A) Increase in red blood cell size
B) Increase in red blood cell production
C) Increased breathing rate
D) Increase in thrombocyte count

(a)

(B) and (C)

(b)

(c)

(A) and (D)

(d)

(A) and (B)

Birds sitting on cows to eat insects is an example of ____________

(a)

Competition

(b)

Mutualism