12th Biology - Zoology - Organisms and Population Practice Question Paper | QB365

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12th Biology - Zoology - Organisms and Population Practice Question Paper

Published on: 03/01/2020

Zoology - Organisms and Population

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

4 x 1 = 4

Pick out the correct statement regarding K-selected species

(a)

Produce many offsprings

(b)

Only few reach adulthood

(c)

Unstable environment

(d)

Long life expectancy

A biologist studies the population of eats in a barn. He found that the average natality was 250, average mortality is 240, immigration is 20 and emigration to be 30. The in population is

(a)

(b)

(c)

(d)

Zero

"Birds and mammals attain greater body size in colder regions than warmer regions." - Choose the correct option.

(a)

Bergmann's rule

(b)

Jordon's rule

(c)

Sewall wright effect

(d)

Allen's rule

Which of the following is an r-species

(a)

Human

(b)

Insects

(c)

Rhinoceros

(d)

Whale

Generic 2

4 x 2 = 8

Camels are well adapted to xeric conditions, how?

What is Q₁₀ value? How it is calculated?

State Allen's rule.

What is Zero Stress?

Generic 3

3 x 3 = 9

Define migration.

10.

Draw a sketch to show J and S shaped growth form of a population.

11.

Differentiate between Tundra and Taiga Biomes.

Find the wrong statement

1 x 2 = 2

12.

i) Birds visiting Vedanthangal show 'migrate' response.
ii) Fertility and Fecundity determine the mortality in a population.
iii) K selected species have long life expectancy.
iv) Degree of competition is high when animals have different sources of food.
a) i and iii
b) ii and iii
c) ii and iv
d) iv only

Assertion and reason

1 x 2 = 2

13.

Assertion: Rapidly growing population has larger proportion of young individuals.
Reason: Natality is high in such a population.
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

Odd one out

1 x 2 = 2

14.

(a) Bacteria in calcium
(b) Cross pollination by bees
(c) Sucker fish and shark
(d) Sea anemone and hermit crab

Fill in the blanks

1 x 1 = 1

15.

Death rate is also known as ___________

Generic 5

1 x 5 = 5

16.

Differentiate between r-selected species and k-selected species

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Answers Key:

Multiple Choice Question

4 x 1 = 4

(d)
Long life expectancy

(d)
Zero

(a)
Bergmann's rule

(b)
Insects

Generic 2

4 x 2 = 8

Camels are able to regulate water effectively for evaporative cooling through the skin and respiratory system and excrete highly concentrated urine, and can also withstand dehydration up to 25% of their body weight.

The effect of temperature on the rate of reaction is expressed in terms of temperature coefficient or Q₁₀ value. The Q₁₀ values are estimated taking the ratio between the rate of reaction at X^oC and rate of reaction at (X-10°C).

Warm blooded animals, living in colder climates, tend to have shorter limbs, ears and other appendages when compared to the members of the same species in warmer climates.

This is the level of exposure of plants to environmental factors that leads to neither injury nor reduction in growth and yield of crops.

Generic 3

3 x 3 = 9

Migration is a peculiar and unique kind of mass population movement from one place to another and back. To avoid the severe winter cold. Eg. Siberian cranes migrate from Siberia to Vedanthangal in Tamil Nadu and return back in spring.

10.

11.

No.	Tundra Biome	Taiga Biomes
1.	This is almost treeless plain in the northern parts of Asia, Europe, and North America.	Taiga is a forest of coniferous trees such as spruce, fir and pine.
2.	Winters are long with little daylight, summers are short, with long daylight hours.	Summer temperature ranges from 10^octo 21^oPc.
3.	Because of the severe winters, many of the animals are migratory. For E g: the many shore birds and water fowl such as ducks and geese, nest in the Tundra during the summer and migrate south for the winter.	Important migratory herbivores include moose, elk, deer and reindeer. Moose and reindeer migrate to the Taiga for winter and to Tundra for summers.

Find the wrong statement

1 x 2 = 2

12.

c) ii and iv

Assertion and reason

1 x 2 = 2

13.

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

Odd one out

1 x 2 = 2

14.

Fill in the blanks

1 x 1 = 1

15.

()
Mortality

Generic 5

1 x 5 = 5

16.

r-selected species k-selected species Smaller sized organisms Larger sized organisms Produce many offspring Produce few offspring Mature early Late maturity with extended parental care Short life expectancy Long life expectancy Each individual reproduces only once or a few times in their lifetime Can reproduce more than once in a lifetime Only a few reach adulthood Most individuals reach a maximum life span Unstable environment, density independent Stable environment, density-dependent