NEET Botany Organisms and Populations Questions Solved


Homeostasis is 
(a) tendency to change with change in environment
(b) tendency to resist change
(c) disturbance in regulatory control
(d) plants and animals extracts used in homeopathy

(b) Homeostasis Ghomes similar, (Gr. homeos = similar, stasis-standing) is the tendency of maintaining a relatively stable internal physiological environment in an organism, or steady-state equilibum in a population or ecosystem. It is carried out by regulatory mechanisms which coordinate internal fuctions such as providing nutrients to cells and transporting substances.

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Identify the biome that is not correctly matched with the physical parameters given in corresponding Column II and Column III:

3. Read page 220, Figure 13.1, XII NCERT

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The most ecologically relevant environmental factor is:

1. temperature

2. Water

3. Light

4. Soil

1. Read page 221, XII NCERT

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If global warming continues, how would the distributional range of some species be affected?

1. There will be a poleward shift

2. There will be an equatorial shift

3. No change expected for any species

4. Shift to marine water from land

1. Read page 222, Intext question , XII NCERT

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Many freshwater animals cannot live for long in sea water and vice versa because of:

1. Buoyancy related problems

2. Lack of impermeable skins

3. Thermolabile enzymes

4. Osmotic considerations

4. Read page 222, XII NCERT

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Which of the following algae is likely to be found in the deepest waters?

(a) Green

(b) Brown

(c) Red

(d) All are found at equal depths

Page 223, Intext question, XII NCERT

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When exposed to cold temperatures, which of the following is responsible for maintaining constant body temperature in humans?

1. Vasoconstriction and shivering

2. Vasodilation and shivering

3. Vasodilation and sweating

4. Vasoconstriction and sweating

1. Read page 224, XII NCERT

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Under unfavorable conditions, many zooplankton species in lakes and ponds are known to enter a stage of suspended development called as:

1. Dormancy

2. Hibernation

3. Aestivation

4. Diapause

4. Read page 225, XII NCERT.

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The given age pyramid represents a:

1. Fast expanding population

2. Slowly expanding population

3. Stable population

4. Declining population

3. Read page 227, XII NCERT.

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Darwinian fitness is represented by:

1. Low r value

2. High r value

3. High K value

4. Low K value

2. Read page 231, XII NCERT

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