If '+' sign is assigned to beneficial interaction, '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to
(1) Mutualism
(2) Amensalism
(3) Commensalism
(4) Parasitism
By a particular interaction in a population, one species was harmed while other was benefited. Such interaction is called as
1. Competition
2. Predation
3. Parasitism
4. Both 2 and 3
In general, which of the following is not an adaptation seen in parasites in accordance with their life style?
1. Loss of unnecessary sense organs
2. Presence of adhesive organs
3. Low reproductive capacity
4. Loss of digestive system
Parasites evolved special adaptations in accordance with their life styles. Choose odd one out with respect to these adaptations.
1. High reproductive capacity
2. Simple life cycle and complex morphological, anatomical features
3. Loss of unnecessary sense organs
4. Loss of digestive system
Which of the following is not an ectoparasite?
1. Lice on humans
2. Copepods on marine fishes
3. Mistletoe on other plants
4. Female Anopheles on humans
Which of the following will breed more than once in their life cycle?
1. Pacific salmon fish
2. Bamboo
3. Cuckoo
4. Both 1 and 3
The evolution of the animal immune system was probably driven by:
(1) Herbivores pushing the animals toward extinction
(2) The selective pressures of parasitic and disease organisms
(3) Competition between the animals and their habitats
(4) Symbiosis between the animals and their predators
Which one of the following is categorised as a parasite in true sense?
1. | Human foetus developing inside the uterus draws nourishment from the mother |
2. | Head lice living on the human scalp as well as laying eggs on human hair |
3. | The cuckoo (koel) lays its eggs in crow's nest. |
4. | The female Anopheles bites and sucks blood from humans. |
Select the false one:
1. The niche of a population is the set of conditions and resources it uses
2. Competitive exclusion principle was first described by Gause, for species of Paramecium
3. If a new predator is introduced to an area the prey species is likely to decrease and possibly become extinct
4. None of the above
Match column I with column II and select the correct option from the codes given below.
Column I | Column II |
A. Commensalism | (i) One inhibited other unaffected |
B. Parasitism | (ii) One benefited other unaffected |
C. Mutualism | (iii) Both are benefitted |
D. Amensalism | (iv) One benefitted other harmed |
A | B | C | D | |
1. | (iv) | (ii) | (iii) | (i) |
2. | (iii) | (iv) | (ii) | (i) |
3. | (ii) | (iv) | (iii) | (i) |
4. | (ii) | (iv) | (i) | (iii) |