Multiple Choice QuestionsChoose the wrong pair
Cenchrus-Savanna
Abies – Coniferous forest
Quercus – Broadleaf forest
Tectona – Temperate forest
Match the following Columns
| Column I (Pollination Technique) | Column II (Pollinator) |
| A. Cheiropterophily | 1. Ant |
| B. Anemophily | 2. Bat |
| C. Myrmecophily | 3. Snail |
| D. Malaciphily | 4. Wind |
A – 3; B – 2; C – 1; D – 4
A – 2; B – 4; C – 1; D – 3
A – 4; B – 3; C – 2; D – 1
A – 1; B – 3; C – 2; D – 4
The permanent decrease in population number occurs due to
migration
natality
emigration
mortality
The process where a population inhibits the growth of other population without affecting itself is known as
amensalism
mutualism
parasitism
commensalism
Which of the following is not a factor that would limit the growth of a population
Food shortage
Immigration
Disease
Famine
A small rise in the body temperature of humans is corrected by
(i) sweating
(ii) dilating the skin arteries
(iii) constricting the skin arteries
(iv) increased tension of muscles in the skin
(i) only
(ii) only
(i) and (ii)
(iii) and (iv)
Which of the following associations shows mutualism
Fig and wasp
Barnacles on whale
Roundworms in human intestine
Orchids on mango tree
Which is correctly labelled with respect to the given diagram
B: Logistic curve
C: Carrying capacity
C: Exponential curve
A: Carrying capacity
Assertion: Some marine animals find it difficult to live in fresh water and vice versa.
Reason: Some animals can tolerate a narrow salinity range, while others can tolerate a wide salinity range.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
For aquatic organism salt concentration (measured as salinity in parts per thousand) is a major factor for their survival. Salinity of different aquatic habitats varies greatly. It is less than 5 per thousand parts, in inland waters, 30-35 per thousand parts in the sea and more than 100 per thousand parts in some hypersaline lagoons. Many fresh water animals cannot live for long in sea water and vice versa because of the osmotic problems they would face due to the change in relative tonicity of the surrounding water with cytoplasm. It may result into endosmosis or exosmosis according to the conditions. The tolerance of organisms to the salinity range varies. Some organisms are tolerant of a wide range of salinities and are called euryhaline e.g. salmon, while some can tolerate only a narrow range of salinity i.e., stenohaline e.g., shark
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