Subject

Biology

Class

NEET Class 12

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(A) Partial regulators (B) Regulators (C) Conformers

In the above graph, A represents partial regulators, B represents regulators and C represents conformers.

Conformers: Majority of the animals (up to 99%) and nearly all plants, cannot maintain a constant internal environment. Their body temperature and osmotic concentration changes according to the surrounding conditions . Such animal and plants are called Conformers.
Regulators: Some animals maintain their homeostasis by physiological or behavioural means. All birds and mammals (Homeothermic or Warm blooded) and a few lower vertebrates and invertebrates can maintain constant body temperature and constant osmotic concentration regardless of the surrounding
conditions. Such organisms are called Regulators.
Partial regulators: If the stressful condition are localized, the animals can escape in place’ and migrate to nearby region, having better environmental conditions. If the unfavourable conditions are for a shorter duration then the animals can 'escape in time’ and avoid those conditionssuspending their activities. Such organisms are partial regulators.

82.

Select the correct statement

Phosphorus cycle is an example of gaseous nutrient cycle
The pyramid of biomass in sea is generally inverted
By the process of humification, soluble inorganic nutrients go down into the soil horizon
A given organism may not occupy more than one trophic level simultaneously
A given organism may not occupy more than one trophic level simultaneously

83.

The rate of biomass production and the rate of production of organic matter during photosynthesis are called respectively

84.

Allen's rule applies to

85.

Pick out the correct option from (a) to (e)

(A) Primary succession begins in areas where natural communities have been destroyed

(B) Hydrarch succession takes place in water

(D) In newly cooled lava secondary succession occurs

86.

Select the wrong statement

The presence of chromogenic substrate gives blue colour colonies, if the plasmid in the bacteria does not have an insert
Retroviruses in animals have the ability to transform
normal cells into cancerous cells
In microinjection, cells are bombarded with high velocity microparticles of gold or tungsten coated with DNA
Since DNA is a hydrophilic molecule it cannot pass through cell membranes
Since DNA is a hydrophilic molecule it cannot pass through cell membranes

87.

Which of the following organisms breeds only once in lifetime?

88.

Select the wrong statement

Human insulin is being commercially produced from a transgenic species of Escherichia coli.
The genetically modified bacillus thuringiensis is used as biopesticide on the commercial scale
Human protein, alpha-1 -antitrypsin is used to treat emphysema
The first transgenic cow, Rosie, produced alpha lactalbumin, enriched milk
The first transgenic cow, Rosie, produced alpha lactalbumin, enriched milk