Organisms and population practice · Mixed difficulty

In most animals, the metabolic reactions proceed in a …A… temperature range (in humans, it is 37℃). But there are microbes (archaebacteria) that flourish in hot springs and deep sea hydrothermal vents where temperature far exceed …B…
Choose the correct option for A and B

Adaptation of parasite may be
I. loss of unnecessary organs
II. presence of adhesive organs
III. origin of suckers to cling to host
IV. loss of digestive system
V. high reproductive capacity
Choose the correct combination

Halophytes are

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

The desert plants in order to tolerate water stress, show

Organism which are restricted to low range of temperature are called

Character displacement take place when there is

Which is the characteristics of desert plant adaptation?

In which one of the following the birth rate is high & death rate is normal

Resource partitioning includes

Assertion: The rate at which a population can
be expected to grow in the future can be
assessed graphically by means of a population
pyramid.

Reason: A triangular population pyramid is
characteristic of a country whose population is
stable, neither growing nor shrinking.

Concept of mimicry was given by …A…
Father of Indian Plant Ecology …B…
Term ‘ecology’ coined by …C…
Here A, B and C refers to

Plants developing in dry condition are

Sunlight is available as a source of energy. The sunlight is very much important in

I. Species level II. Population level
III. Individual level IV. Community level
Out of the levels given at a which level selection operates

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?

Assertion (A): Small sized birds and mammals are rarely found in Polar Regions.

Reason (R): Small animals have large surface area relative to their volume, so that they can minimize loss of heat.

5th June is celebrated as

Identify the basic levels of ecology
I. Organisms II. Populations
III. Communities IV. Biomes
V. Human VI. Vertebrates
Choose the correct option

Which of the following is inappropriately defined? I. Host is an organism which provides only food, shelter to another organism II. Amensalism is a relationship in which one species is benefitted, whereas the other is unaffected III. Predator is an organism that catches and kills other organism for food of same species IV. Endo parasite is an organism which always lives inside the body of other organism and may kill it Select the correct option

Formation of wide variety of habitats takes place by

Mechanical tissue is best developed in:

A population interaction in which both species are benefitted is called

Organisms which breed only once in their lifetime

Altitude sickness is

If ${b}=65$ and ${d}=45, {N}=100$ then find out $\frac{{dN}}{{dt}}.$

Living in same habitat, organisms of same species of form

Competition of species leads to

Phenotypic variants formed in a population due to change in environment are called

Radiation below the visible range are called