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Organisms And Populations

Question

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How do desert plants prevent loss of water ?

Solution

Adaptations of desert plants to prevent loss of water are-:

1. Presence of thick cuticle on stem and leaf surfaces. This reduces the rate of transpiration.

2. Some desert plants develop succulent organs (stems, leaves and roots) e.g. Asparagus, Begonia, Bryophyllum.

3. Presence of extensive root system to absorb water.

4. Either leaves are absent or small-sized leaves or transformed into spines to minimize the rate of transpiration.

5. The stomata get sunken to reduce the rate of transpiration.

6. Some xerophytes remain dormant either as seeds or as roots and they sprout up during rains e.g. Cassia, Argemone

Some More Questions From Organisms and Populations Chapter

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........................

List two negative interactions between two species.

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