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Organisms And Populations

Question
CBSEENBI12002756
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How does pruning help in making the hedge dense?

  • It induces the differentiation of new shoots from the rootstock

  • It frees axillary buds from apical dominance

  • The apical shoot grows faster after pruning

  • It released wound hormones

Solution

B.

It frees axillary buds from apical dominance

Pruning helps in making the hedge dense as it frees the axillary buds from apical dominance. In fact, the apicies of the plant axis (e.g. Shoot apex) has the highest concentration of auxin which suppresses the axillary buds while promotes the growth of apical bud. When the shoot apex is cut down through pruning, the axillary buds grow and the hedge becomes dense.

Some More Questions From Organisms and Populations Chapter

Which of the following interaction both species suffer ?

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

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