ORGANISMS & POPULATIONS
1.Find odd one out, according to parasitism
2.Which model is considered a more realistic one?
3.Lichens represents an intimate mutualistic relationship between
4.The birth and death rates of four countries are given below. Which one will have the least population growth rate?
5.Regulators are also called
6.Competition occurs when
7.Many parasites have evolved to be _A_ in such a way that both host and the parasite tend to _B_ that is, if the host evolves special mechanisms for rejecting or resisting the parasite, the parasite has to evolve mechanisms to _C_ and neutralize them, in order to be successful with the same host species Choose the correct option for A, B and C
8.I. The human liverfluke, a nematode parasite, depends on two intermediate hosts (snail and pig) to complete its life cycle II. The malaria parasite needs a vector (mosquito) to spread to other hosts III. The female mosquito is not considered parasite, however it needs our blood for reproduction IV. In case of brood parasitism, the eggs of parasitic birds (e.g.,cuckoo) are not detected and ejected from the nest because of parasite’s eggs resemble the hosts eggs in morphology and colour V. A population of frogs protected from all predators would increase indefinitely. Which statements are correct?
9. 'r' value for human population in 1981. In India was
10.I. Some species of insects and frogs are critically coloured (camouflaged) II. Some animals are poisonous III. Monarch butterfly are distasteful The above adaptations are against
11.Homeostasis is
12.Zero growth of population is indicated by
13.Population density of terrestrial organisms is measured in terms of individuals per
14.Differentiation of various tissue and organs in response to light is called
15.Certain characteristic demographic features of developing countries are
16.Sigmoid growth curve is represented by
17.Mycorrhiza is a mutualistic association of plants root with fungi. The association occurs in
18.In a population, unrestricted reproductive capacity is called
19.I. Species level II. Population level III. Individual level IV. Community level Out of the levels given at a which level selection operates
20.Logistic growth is represented by which equation
21.If in a pond there are 20 lotus plants of last year and through reproduction 8 new plants are added. Then the birth rate is
22.A population growing in a habitat with limited resources shows four phases of growth in the following sequence
23.Which of the following supports a dense population of plankton and littoral vegetation?
24.The organism which tolerate wide range of salinity called _A_ II. The organism which tolerate narrow range of salinity called _B_ Choose the correct option for A and B
25.A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this I. Lots of urea and phosphate fertilizers were used in the crops in the vicinity. II. The area was sprayed with DDT by an aircraft. III. The lake water turned green and stinky. IV. Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?
26.Which one is right for logistic model for population growth? I. Population growth rate increases as the size of population approaches the carrying capacity II. All individual have same effect on population growth III. There are unlimited natural resources IV. As population increases the competition goes on increasing Select the correct combination
27.American lakes visiting flamingoes and resident fishes compete for their common food …A… in the lake resources …B… limiting for competition to occur; in interference competition, the feeding efficiency of one species might be …C… due to the interfering and inhibitory presence of the other species, even if resources (food and space) are abundant Choose the correct option for A, B and C
28.Average temperature of thermal springs and deep sea hydrothermal vents exceeds
29.Population size is more technically called
30.Plants of aquatic habitat is called
31.Under a particular set of selection pressure, organisms evolve towards the most _A_ reproductive strategy. Some organisms breed only _B_ in lifetime while others breed _C_ in life time Choose the correct option for A, B and C
32.Submerged hydrophytes show
33.Desert lizards lack the _A_ ability that mammals have to deal with the _B_ temperatures of their habitat, but manage to keep their body temperature fairly constant by _C_ means Choose the correct option for A, B and C
34.Gause’s law is true only when
35.In an area there are 200 Parthenium and is single banyan tree. Which of the conculsion (s) is/are correct? I. Population density of banyan is low II. Population cover area of banyan is high III. In above cases the percentage of cover of biomass is more meaningful than population size
36.Which of the following statements regarding species interdependence are true? I. An Association of two species where one is benefitted and other remains unaffected is called mutualism. II. An interspecific association where both partners derive benefit from each other is called commensalism. III. A direct food relation between two species of animals in which one animal kills and feeds on another is referred as predation. IV. A relationship between two species of organisms where both are partners are benefitted from each other is called symbiosis.
37.The permanent decrease in population number occurs due to
38.Ecology is the branch of biology which deals with interaction between
39.Which competition is more intense?
40.Exotic species are also called I. introduced species II. alien species III. non-indigenous species IV. non-native species Choose the correct combination
41.Mass of living matter at a trophic level in an area at any time is called
42.Which one of the following is a matching pair of certain organism(s) and the kind of association?
43.In bacteria, fungi and lower plants, various of thick-walled _A_ are formed, which help them to survive _B_ conditions-these germinate on availability of suitable environment. In higher plants _C_ and some other vegetative reproductive structures serve as means to tide over periods of stress besides helping in dispersal-they germinate to form new plants under favourable moisture and temperate conditions Choose the correct option for A, B and C
44.Level of competition between species depends on I. availability of resources II. population density III. group interaction of organism Choose the correct combination
45.Reproductive isolation between segments of a single population is termed as
46.I. Biochemical adaptation are seen in organisms living in great depth of the ocean to face crushing pressure II. Allen’s rule is explain mammals living in colder climates III. Altitude sickness is caused because of body not getting enough oxygen due to low atmospheric pressure at high altitude IV. Desert lizards lack behavioural means to manage to their body temperature Choose the correct option for above adaptations
47.The soil with poorest water holding capacity is
48.Epiphyte is an example of
49.You never see any cattle or goat browsing on Calotropis due to
50.When there are large number of post-reproductive or older individuals and lesser number of pre-reproductive individuals then that population is