Organisms and population practice · Mixed difficulty

Ecological hierarchy comprises, which of the following sequence

Mycorrhiza is a mutualistics association of plants root with fungi. The association occurs in

Factors which determine to the large extent the vegetation of any area are I. pH of soil II. mineral composition of the soil III. water holding capacity of soil IV. weather condition Choose the correct option

A female fig wasp enters the syconium of a fig, pollinates the flowers and lays eggs in the ovaries of some of the flowers. The young larvae grow up, eat (and kill) some, but not all of the seeds and complete their life cycle.
The fig is completely dependent on fig wasps to pollinate its flowers and the fig wasp requires figs to complete its life cycle
The interaction between figs and fig wasps has aspects of
I. mutualism
II. host-parasite interaction
III. competition
IV. ammensalism
V. protocooperation
Select the correct option

Ratio between mortality and natality is called

The term ‘Niche’ was first used by

B-horizon is also called

Plats which behave as mesophytes in rainy season and as xerophytes in summers are called

If a person moves from plains to hill station,
where atmospheric pressure is about 200 mm Hg
less than that at sea level, after 14 months
A. There will be difficulty in breathing
B. The value of $p{O_2}$ in blood will increase
C. The number of RBCs increases in that person
Select the option that is correct for that acclimatized person.

Large size of pinnae in animals of warm region in comparison to animal of cold region is due to

In growth pattern, (1 – N/K) is

Assertion (A): The female mosquito is not considered a parasite, although it needs human blood for reproduction.
Reason (R): The female mosquito does not takes free lodging from human.

In aquatic system, actively moving animal organisms are:

Statement I: In nature, animals. plants, and microbes do not and cannot live in isolation.

Statement II: For any species. the minimal requirement is one more species on which it can feed.

A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

A population interaction in which one species is benefitted and other species remains unaffected (+, 0) is called

Which of the following is the stage of suspended development?

Find odd one out, according to parasitism.

Newly developed pathogens are more damaging to host because host are called

How much percentage of animals on this earth are regulators?

Exotic species are also called
I. introduced species
II. alien species
III. non-indigenous species
IV. non-native species
Choose the correct combination

Assertion: Coral reefs are not found in the
regions from West Bengal to Andhra Pradesh
but are found in Tamil Nadu and on the East
coast of India.

Reason: Corals require low siltation, low fresh
water inflow by rivers, high salinity and optimal
temperature to colonize.

How does a kangaroo rat cope with the North American desert environment?

Term ‘ecology’ was given by

What is the name of the interaction between species when one’s fitness dominates the other’s existence and fitness?

Identify the incorrect statement.

(i) Thermoregulation energetically least expensive process for many organisms like shrews and humming birds.

(ii) $99 \%$ animals and nearly all plants cannot maintain their constant internal environment.

(iii) During the course of evolution, the costs and heights of maintaining a constant internal environment are discarded.

(iv) In aquatic animals, the osmotic concentration of the body fluids change with that of the ambient water osmotic concentration.

Diapause is stage of suspended development in lakes and ponds. Find out the season in which it occurs

In 2005, for each of the 14 million people present in a country, 0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:

In a life table, the number of individuals alive at the beginning of the 1st year to 2nd year interval is 800. During this interval, 200 individuals die. The death rate for this interval is

Photosynthesis in Opuntia is done by