Which one of the following is most appropriately defined?
[A] Host is an organism which provides food to another organism
[B] Amensalism is a relationship in which one species is benefitted whereas the other is unaffected
[C] Predator is an organism that catches and kills other organism for food
[D] Parasite is an organism which always lives inside the body of other organism and may kill it
Study the four statements (1-4) given below and select the two correct ones out of them.
(A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
(B) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
(C) Predators ultimately lead to the extinction of prey species
(D) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders
The two correct statements are
[A] (B) and(C)
Which two of the following changes (1-4) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
(A) Increase in red blood cell size
(B) Increase in red blood cell production
(C) Increased breathing rate
(D) Increase in thrombocyte count
Changes occurring are:
[A] (B) and(C)
Which one of the following is one of the characteristics of a biological community?
Consider the following four conditions (A-D) and select the correct pair of them as adaptation to environment in desert lizards. The conditions:
(A) Burrowing in soil to escape high temperature
(B) Losing heat rapidly from the body during high temperature
(C) Bask in sun when temperature is low
(D) Insulating body due to thick fatty dermis
Which one of the following is categorized as a parasite in true sense?
[A] Human foetus developing inside the uterus draws nourishment from the mother
[B] Head louse living on the human scalp as well as laying eggs on human hair
[C] The cuckoo (koel) lays its eggs in crew’s nest
[D] The female Anopheles bites and sucks blood from humans
Cuscuta is an example of:
[A] Brood parasitism
People who have migrated from the planes to an area adjoining Rohtang Pass about six months back:
[A] Have more RBCs and their haemoglobin has a lower binding affinity to O2
[B] Are not physically fit to play games like football
[C] Suffer from altitude sickness with symptoms like nausea, fatigue, etc
[D] Have the usual RBC count but then haemoglobin has very high binding affinity to O2
A biologist studied the population of eats in a barn. He found that the average natality was 250 average mortality 240 immigration 20 and emigration 30.The net increase in population is:
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is:
Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:
[A] Western Ghat
[C] Corbett National Park
[D] Keolado National Park
Leaves become modified into spines sin
[D] Skin cotton
In which of the following interactions both partners are adversely affected?
An association of individuals of different species living in the same habitat and having functional interactions is:
[A] Biotic community
[D] Ecological niche