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Organisms And Populations

Question
CBSEENBI12001827

How do snails, seeds, bears, zooplanktons, fungi and bacteria adapt to conditions unfavourable for their survival?

Solution

The various ways in which the animal adapt to unfavourable conditions are:

Snails undergo aestivation to avoid summer-related problems like excessive heat and desiccation.
Seeds go into a state of ‘dormancy’ in which they reduce their metabolic activities. They germinate when the conditions are again favourable.
Bears go into hibernation to avoid the harsh winter conditions in which they reduce their body metabolic activities to a great extent.
Zooplanktons undergo a state of ‘Diapause’ that is a stage of suspended development)

Fungi form thick-walled spores to survive the unfavourable conditions and germinate on the availability of suitable conditions.

Bacteria adapt to unfavourable conditions by forming endospores.

Some More Questions From Organisms and Populations Chapter

In which of the following interaction both species are benefitted ?

Fill in the blanks with suitable words :

1. The optimal capacity of the organism to produce offspring is called........................

2. Rapid increase in human population is called........................

3. Mathematical expression of the growth of population is called........................

4. Yeast cells grown in a culture medium show........................growth curve.

5. Main cause of population explosion is........................

State true or false :

Coin one word for the following statements :

1.Organism that can tolerate only a narrow range of salinity.

2. Plants that can survive a wide range of temperature.

3. Interaction of two species in which one is benefited while other is neither benefited nor harmed.

4. Number of births during a given period in the population that are added to the initial density.

5. the process of maintaing a constant body temperature.

A few organisms can tolerate and thrive in a wide range of temperature, they are called........................

Majority of organisms are restricted to a narrow range of temperature, such organisms are called ........................ 

The organisms ideally try to maintain the constancy of its internal environment by the process called........................

Mammals from colder climates have shorter ears and limbs to minimize heat loss. This rule is called........................ 

The parasites that feed on external surface of host organisms are called ........................

The parasites that live inside the body at different sites (liver, kidney, lungs, RBC etc.) are called........................