Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Enzyme and carbohydrates dominate in the digestive tract of

  • carnivores

  • omnivores

  • parasites

  • herbivores


D.

herbivores

herbivore is an animal that gets its energy from eating plants and only plants. These animals eat more carbohydrate food, therefore enzyme carbohydrate dominates.


52.

The first animal domesticated by primitive man was

  • dog

  • horse

  • cat

  • cow


A.

dog

Dog was the first animal to be domesticated by man.


53.

The correct sequence for the formation of chemicals on the primitive earth is

  • NH3, protein, carbohydrate and nucleic acid

  • NH3, water, nucleic acids and proteins

  • NH3, nucleic acids, protein and carbohydrate

  • protein, carbohydrate, water and nucleic acids


B.

NH3, water, nucleic acids and proteins

As the earth cooled, free atoms in the atmosphere formed inorganic molecules (including H2O and NH3) which interacted to form sugars and then proteins and nucleic acids.


54.

Which country has the greatest contribution for the hole formation in ozone layer?

  • USA

  • Germany

  • Russia

  • Japan


A.

USA

USA along release 37% of CFCs.


55.

If there are 4 microspore mother cells in an anther, what will be the number of pollen grains?

  • 4

  • 8

  • 12

  • 16


D.

16

Each microspore mother cell divides meiotically to form 4 pollen grains (4 × 4 = 16).


56.

Radio-tracer technique shows that DNA is in

  • single-helix stage

  • double-helix stage

  • multi-helix stage

  • none of these


D.

none of these

DNA is a helical structure. It could be through X- ray diffractions patterns of DNA studied by Wilkins and Franklin.


57.

When paternal and maternal chromosomes change their materials with each other in cell division this event is called

  • synapsis

  • crossing over

  • bivalent forming

  • dyad- forming


B.

crossing over

Crossing over is the mutual exchange of segments of homologous chromatids during first meiotic prophase.

Synapsis is the fusion of chromosome pairs at the start of meiosis.

DNA replication precedes the start of Meiosis I. During Prophase I, homologous chromosomes pair and form synapses. The paired chromosomes are called bivalents and the formation of chiasmata caused by genetic recombination becomes apparent.

Dyad formation is a double chromosome resulting from the splitting of a tetrad during meiosis (germ cell formation).


58.

The 10% energy transfer law of food chain was given by

  • Stanley

  • Weismann

  • Lindemann

  • Tansley


C.

Lindemann

Only about 10% of the energy is transferred from one trophic level to the next. This 10% law of energy transfer was proposed by Lindemann (1942).


59.

AIDS disease was first reported in

  • Russia

  • Germany

  • USA

  • France


C.

USA

AIDS was first reported from USA in 1981.


60.

When a natural predator (living being) is applied on the other pathogen organism to control them, this process is called

  • biological control

  • genetic engineering

  • artificial control

  • confusion technique


A.

biological control

Biological control methods include using natural predators of pests, using resistant varieties, crop rotation etc.