Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

71.

Increase in concentration of the toxicant at successive tropic levels is known as 

  • biomagnification

  • biodeterioration

  • biotransformation

  • biotransformation


A.

biomagnification

Biomagnification is the sequence of processes in an ecosystem by which higher concentrations of a particular toxicant, such as the pesticide or heavy metal are reached in higher organisms of the food chain, generally through a series of prey-predator relationships. 

941 Views

72.

Coconut water from a tender coconut is

  • Immature embryo

  • Free nuclear endosperm

  • Innermost layers of the seed coat

  • Innermost layers of the seed coat


B.

Free nuclear endosperm

The coconut water from tender coconut that we are familiar with, is nothing but free nuclear endosperm (made up of thousands of nuclei) and the surrounding white kernel is the cellular endosperm. In the most common types of endosperm development, the Primary Endosperm Nucleus (PEN) undergoes successive 

1266 Views

73.

Which of the following layers in an antral follicle is acellular?

  • Granulosa

  • Theca interna

  • Stroma

  • Stroma


D.

Stroma

Follicles that form an antrum during maturation are called antral follicle or Graafian follicle.
During the development of the follicle, a glycoprotein polymer capsule called the zona pellucida which is acellular, forms around the oocyte, separating it from the surrounding granulosa cells. 
This layer remains with the oocyte after ovulation and contains enzymes that catalyse with sperm to allow penetration. 

2089 Views

74.

During ecological succession

  • the gradual and predictable change in species composition occurs in a given area.

  • the establishment of a new biotic community is very fast in its primary phase.

  • the number and types of animals remain constant.

  • the number and types of animals remain constant.


A.

the gradual and predictable change in species composition occurs in a given area.

The gradual and fairly predictable change in the species composition of a given area is called ecological succession. During succession some species colonise an area and their populations become more numerous, whereas populations of other species decline and even disappear.

1451 Views

75.

If you suspect major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?

  • Fibrinogin in plasma

  • Serum albumins

  • Haemocytes

  • Haemocytes


D.

Haemocytes

Globulin is one of the protein found in serum and it includes proteins, enzymes, complement and immunoglobins (antibody)
That's why, if major deficiency of antibodies is suspected in a person, the globulins in serum is tested as the confirmatory evidence. 

1252 Views

76.

Most animals that in deep oceanic water are

  • primary consumers

  • secondary consumers

  • tertiary consumers

  • tertiary consumers


D.

tertiary consumers

Most animals that live in deep oceanic waters and called benthos are scavengers or detritivores. These organisms include crustaceans, polychaetes and some microorganisms.

1987 Views

77.

The DNA molecule to which the gene of interest is integrated for cloning is called

  • Transformer

  • Vector

  • Template

  • Template


B.

Vector

The DNA molecule to which the gene of interest is integrated for cloning is called vector. It is a DNA molecule used as a vehicle to artifically carry foreign genetic material into another cell, A vector containing foreign DNA is termed as recombinant DNA.

891 Views

78.

The introduction of t-DNA into plates involves

  • Infection of the plant by agrobacterium tumefaciens

  • Altering the pH of the soil, then heat-shocking the plants

  • Exposing the plates to cold for a brief period

  • Exposing the plates to cold for a brief period


A.

Infection of the plant by agrobacterium tumefaciens

Agrobacterium tumefaciens, a pathogen of several dicot plants is able to deliver a piece of DNA known as tDNA to transform normal plant cells into a tumour and direct these tumour cells to produce the chemicals required by the pathogen. 

778 Views

79.

The UN conference of Parties on climate change in the year 2012 was held at

  • Durban

  • Doha

  • Lima

  • Lima


B.

Doha

The UN conference of Parties (COP-18) was the UN framework convention on climate change (UNFCC) was held in Doha, Qatar from 26th Nov, to the 8th Dec 2012.

864 Views

80.

Which one of the following events in not associated with ovulation in human female?

  • Decrease in oestradiol

  • Full development of Graafian follicle

  • Release of secondary oocyte

  • Release of secondary oocyte


A.

Decrease in oestradiol

Oestradiol levels fall after ovulation and before mensuration while, its level peak prior to ovulation. Oestradiol are not associated with ovulation. Decrease in oestradiol level result in the cessation of menstruation. 

1180 Views