Organisms and population practice · Mixed difficulty

Assertion: Predators not only take the old, sick
and young individuals but also the healthy
individuals.

Reason: If predators kille only the old, sick and
young prey individuals, then there would be no
evolution of antipredatory traits in the prey
population.

Cold-blooded animals fall under the category of

Mark the wrong match.

“Complete competitiors cannot coexist” is true for

When a population grows in a habitat with limited resources, the population growth after phase of acceleration and deceleration finally achieves asymptote

After poaching 3 lions in a certain forest of Gujarat, only 15 are left in a year. Determine the death rate
per capita.

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

(A): Two closely related species competing for the same resource cannot co-exist indefinitely.

(R): If two species compete for the same resource, they could avoid competition by choosing, for instance, different times for feeding or different foraging patterns.

In the association between two organisms, if one organism is benefitted and the other is not benefitted, this relationship is known as

Example involved in the Connell’s elegent field experiments

Which of the following supports a dense population of plankton and littoral vegetation?

Mycorrhizae help in absorption of:

Basic unit of ecological hierarchy is

Ephemerals are xerophytes that are

‘Cryptically-coloured’ (camouflaged) is a technique through which prey can

According to Bergmann's rule, the mammals from cold climate have

In a g raph of population, on x-axis time and on y-axis population is plotted. A parallal line to x-axis shows

Which of the given population interaction is seen between plant and pollinators?

Many fishes of freshwater can’t live in sea water and vice-versa because of

The relationship between the alga Microcystis and the surroundings fauna correspond to

A biologist studied the population of rats 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

Differentiation of various tissue and organs in response to light is called

Hibernation is

Autecology is the study of relationship between

Heat loss or heat gain is a function of surface area. Since small animals have a …A… relative to their volume, they tend to lose body heat very fast, when it is cold outside; then they have to expend …B… to generate body heat through metabolism. This is the main reason why very small animals are …C… found in polar regions
Choose the correct options for A, B and C

According to Allen’s rule, the mammals from colder climates have

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?

Few species have evolved adaptations to avoid unfavourable conditions by escaping in time. Choose the odd one w.r.t. it.

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

Hierarchy is