Consider the following statements
concerning food chains
i) Removal of 80% tigers from an area
resulted in greatly increased growth of
vegetation.
ii) Removal of most of the carnivores
resulted in an increased population of
deers.
iii) The length of food chains is generally
limited to 3 – 4 trophic levels due to energy loss.
iv) The length of food chains may vary from
2 to 8 trophic levels.
Which two of the above statements are
correct?
1. i and ii
2. ii and iii
3. iii and iv
4. i and iv
Match the following and select the correct option
Column I Column II
(I) Earthworm (i) pioneer species
(II) Succession (ii) Detritivore
(III) Ecosystem service (iii) Natality
(IV) Population growth (iv) Pollination
I |
II |
III |
IV |
|
1. |
i |
ii |
iii |
iv |
2. |
iv |
i |
iii |
ii |
3. |
iii |
ii |
iv |
i |
4. |
ii |
i |
iv |
iii |
Consider the following statements concerning food chains
i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
ii) Removal of most of the carnivores resulted in an increased population of deers.
iii) The length of food chains is generally limited to 3 – 4 trophic levels due to energy loss.
iv) The length of food chains may vary from 2 to 8 trophic levels.
Which two of the above statements are correct?
1. i and ii
2. ii and iii
3. iii and iv
4. i and iv
Consider the following four statements (a-d) and select the correct option stating which ones are true (T) or false (F)
a. | Organisms at each trophic level depends on those at higher trophic level for their energy demands. |
b. | Each trophic level has a certain mass of living material at a particular time called standing crop. |
c. | Each trophic level has a certain mass of non-living material at a particular time called standing state. |
d. | The number of trophic levels in a grazing food chain is not restricted. |
Options
a | b | c | d | |
1. | T | T | F | F |
2. | F | T | F | T |
3. | T | F | T | F |
4. | F | T | T | F |
Column-I | Column-II | ||
A. | Tansley | (i) | Gave the term ecology |
B. | Ramdeo Mishra | (ii) | Father of ecology |
C. | Reiter | (iii) | Correctly defined ecology |
D. | Ernst Haeckel | (iv) | Gave the term ecosystem |
Assertion: In a food chain, members of successive higher levels are fewer in number.
Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.
1. Both Assertion & Reason are true and Reason is the correct explanation of Assertion
2. Both Assertion & Reason are true but Reason is not the correct explanation of Assertion
3. Assertion is true statement but Reason is false.
4. Both Assertion and Reason are false statements.
A. | The base of each pyramid represents the producers or the first trophic level while the apex represents tertiary or top-level consumer |
B. | The pyramid of energy is always upright |
C. | A given species can occupy only one trophic level in the same ecosystem at the same time |
D. | The pyramid of number in tree ecosystem is upright |
E. | Saprophytes are not given any place in ecological pyramids |
List I | List II |
A. Primary consumers | I. Top carnivore |
B. Tertiary consumers | II. Herbivore |
C. Producers | III. Carnivore |
D. Secondary consumers | IV. Plants |