CBSE
Multiple Choice QuestionsThe permanent decrease in population number occurs due to
migration
natality
emigration
mortality
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
Study of Ecology of population is called
Autecology
Synecology
Ecotype
Demecology
Which of the following associations shows mutualism
Fig and wasp
Barnacles on whale
Roundworms in human intestine
Orchids on mango tree
The process where a population inhibits the growth of other population without affecting itself is known as
amensalism
mutualism
parasitism
commensalism
Choose the wrong pair
Cenchrus-Savanna
Abies – Coniferous forest
Quercus – Broadleaf forest
Tectona – Temperate forest
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 is correctly labelled with respect to the given diagram
B: Logistic curve
C: Carrying capacity
C: Exponential curve
A: Carrying capacity
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
