Home
Class 7
BIOLOGY
Three species of fish P, Q and R have di...

Three species of fish P, Q and R have different body patterns and live in a lake as shown in figure.

A predater who feeds on all these fish is introduced into the lake. Which of the following graph most correctly represent the expected population of these fish after some time?

Text Solution

Verified by Experts

The correct Answer is:
B
The body pattern on the fish Q resembles the pattern on aquatic plants. Thus, it will blend with its surroundings (camouflage) and can avoid the predator, and therefore it will be eaten the least.
Fish P has some resemblance to the plants while fish R can be easily spotted among the plants because it lacks any body pattern and looks different from weeds. Thus, fish R will be eaten the most, and hence its population will show maximum decline. Population of fish Q will gradually increase because it will face reduced competition from other fish.
Promotional Banner

Topper's Solved these Questions

  • NSO MODEL TEST PAPER 02

    SCIENCE OLYMPIAD FOUNDATION |Exercise ACHIEVERS SECTION|4 Videos

  • NSO MODEL TEST PAPER 03

    SCIENCE OLYMPIAD FOUNDATION |Exercise ACHIEVERS SECTION|3 Videos

Similar Questions

Explore conceptually related problems

Three species of fish X, Y and Z with different body patterns are found in a lake. A predator who feeds on all the three fishes X, Y and Z, is introduced into the lake. Which of these fish will be most affected?

Consider three P, Q, R, salts among them P and Q salts have different cations annd also have different coloured polyatomic anion due to charge transfer phenomenon while P and R salts have same cation but have different anions. Salts R decomposes into an acidic gas an a basic gas. Q. Salt P decomposes on heating into a coloured solid, neutral gas a neutral vapour, then which of the following can not be the product of salt P after decomposition?

Seven persons - A, B, C, D, E, F and G live on seven different floors of a building but not necessarily in same order. Lowermost floor of building is numbered 1, one above that is numbered 2 and so on till top most floor is numbered 7. Each one of them also own different brands of Car, namely Fiat, Hyundai, Honda, Skoda, Toyota, Ford and Chevrolet.(but not necessarily in same order). All of them went to tour on seven different days starting from Monday to Sunday of the same week) A lives an odd numbered floor but not on floor numbered Three. Only two persons live between D and the one who owns Toyota. The one who owns Honda lives immediately above C. The one who owns Toyota went to tour on one of the days before Thursday. The one who owns Hyundai lives on odd numbered floors above D. B lives on the floors above E. Only three persons live between C and the one who owns Hyundai. The person who went to tour on Friday owns Fiat Car. The one who owns Fiat lives immediately above the one who owns Chevrolet. G lives on an odd numbered floor. E does not own Honda. D went to tour on Sunday Only one person lives between B and E. The one who owns Toyota lives immediately above A. Neither Nor A owns Skoda. The one who went to tour on Wednesday immediately after the one who owns Hyundai. The one who owns Honda went to tour immediately before the one who lives in floor no 3. There are two persons live between the floor no 4 and the person who went to tour on Wednesday. The one who went to tour on Wednesday is not C. Which of the following statements is true with respect to the given information ?

Seven persons - A, B, C, D, E, F and G live on seven different floors of a building but not necessarily in same order. Lowermost floor of building is numbered 1, one above that is numbered 2 and so on till top most floor is numbered 7. Each one of them also own different brands of Car, namely Fiat, Hyundai, Honda, Skoda, Toyota, Ford and Chevrolet.(but not necessarily in same order). All of them went to tour on seven different days starting from Monday to Sunday of the same week) A lives an odd numbered floor but not on floor numbered Three. Only two persons live between D and the one who owns Toyota. The one who owns Honda lives immediately above C. The one who owns Toyota went to tour on one of the days before Thursday. The one who owns Hyundai lives on odd numbered floors above D. B lives on the floors above E. Only three persons live between C and the one who owns Hyundai. The person who went to tour on Friday owns Fiat Car. The one who owns Fiat lives immediately above the one who owns Chevrolet. G lives on an odd numbered floor. E does not own Honda. D went to tour on Sunday Only one person lives between B and E. The one who owns Toyota lives immediately above A. Neither Nor A owns Skoda. The one who went to tour on Wednesday immediately after the one who owns Hyundai. The one who owns Honda went to tour immediately before the one who lives in floor no 3. There are two persons live between the floor no 4 and the person who went to tour on Wednesday. The one who went to tour on Wednesday is not C. Which of the following combinations is True with respect to the given arrangement ?