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Class 12 Biology: Organisms and Populations — Chapter Test 1

Class 12 • Biology • Organisms and Populations • Chapter Test

MediumFREE

15

Questions

20 min

Duration

15

Marks (1 each)

No

Negative marking

Original practice questions with full solutions by ExamPortal.

Instructions

  • • Read each question carefully and pick the correct answer.
  • • You can mark questions for review and come back to them.
  • • Answers are saved automatically.
  • • The test is submitted automatically when time runs out.

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This test is completely free.

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SYLLABUS & QUESTION BLUEPRINT

Sample Practice Questions

Preview 5 sample questions from this 15-question test. Test your knowledge below or take the full exam in timed CBT mode.

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Question 1 of 15
Population density is the number of individuals:
A
of all species
B
of a species per unit area or volume
C
that die in a year
D
born per year
View Correct Answer & Step-by-Step Solution
Correct Option:(B)of a species per unit area or volume

Detailed explanation is available inside the official test attempt review.

Question 2 of 15
The logistic growth curve is:
A
J-shaped
B
S-shaped (sigmoid)
C
straight line
D
U-shaped
View Correct Answer & Step-by-Step Solution
Correct Option:(B)S-shaped (sigmoid)

Detailed explanation is available inside the official test attempt review.

Question 3 of 15
Exponential growth gives a:
A
S-shaped curve
B
J-shaped curve
C
flat line
D
bell curve
View Correct Answer & Step-by-Step Solution
Correct Option:(B)J-shaped curve

Detailed explanation is available inside the official test attempt review.

Question 4 of 15
The logistic growth equation is:
A
dNdt=rN\frac{dN}{dt} = rN
B
dNdt=rN(K−NK)\frac{dN}{dt} = rN\left(\frac{K - N}{K}\right)
C
N=KrN = Kr
D
dNdt=K\frac{dN}{dt} = K
View Correct Answer & Step-by-Step Solution
Correct Option:(B)dNdt=rN(K−NK)\frac{dN}{dt} = rN\left(\frac{K - N}{K}\right)

Detailed explanation is available inside the official test attempt review.

Question 5 of 15
An interaction where one species benefits and the other is unaffected is:
A
mutualism
B
commensalism
C
parasitism
D
competition
View Correct Answer & Step-by-Step Solution
Correct Option:(B)commensalism

Detailed explanation is available inside the official test attempt review.

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Frequently asked questions

How many questions are there in Class 12 Biology: Organisms and Populations — Chapter Test 1?

There are 15 questions to answer in 20 min. Each correct answer gives 1 mark, for a total of 15 marks.

Is there negative marking?

No. Wrong answers do not lose marks, so attempt every question.

Is this mock test free?

Yes, it is completely free. Just log in with your email to start.

What does this test cover?

It covers the chapter "Organisms and Populations" of Class 12 Biology. All questions are original, with a full solution for each.

Will I see my result and the solutions?

Yes. Right after you submit you get your score, accuracy, rank and percentile, and you can review every question with the correct answer and a step-by-step explanation.

Can I take this test again?

Yes, you can retake it as many times as you like and compare your scores.