Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The excretory material of bony fish is:

  • urea

  • protein

  • ammonia

  • amino acid


A.

urea

The excretory and osmoregulatory organs of the fishes are the gills and kidney. Excretion in bony fishes is ureotelic (i.e., they excrete urea) but some freshwater bony fishes are ammonotelic (i.e., excrete ammonia).


2.

Blastula of frog has :

  • blastopore

  • blastocoel

  • arahenteron

  • gastropore


B.

blastocoel

During early embryonic development of frog a blastula stage comes after morula stage which contain a small irregular excentric space or cavity called blastocoel or segmentation cavity appear in the animal hemisphere.


3.

The enzyme, which combines with non-protein part to form a functional enzyme known as :

  • co-enzyme

  • holoenzyme

  • apoenzyme

  • prosthetic group


B.

holoenzyme

Apoenzyme is the proteinaceous part of an enzyme. The apoenzyme plus non- protein aceous part is called holoenzyme.

Co-enzyme is a non- protein compound that is necessary for the function of an enzyme.

Prosthetic group is a non- protein group, forming a part of or combined with a protein.


4.

Passive food ingestion in Amoeba is known as :

  • import

  • invagination

  • circumfluence

  • circumvallation


A.

import

Import involves passive sucking of food into body by rapture of plasmalemma e.g., ingestion of algae.


5.

The group of anamniota includes:

  • reptiles and birds

  • birds and mammals

  • fishes and amphibians

  • reptiles, and mammals


C.

fishes and amphibians

Anamniote are an informal group comprising the fishes and the amphibians. Amnion is an extraembryonic membrane that surrounds an embryo in reptiles, birds and mammals. Anamniotes are vertebrate animals as they lack amnion membrane e.g., fishes and amphibians.


6.

Haemocoel is found in :

  • Hydra and Aurelia

  • Taenia and Ascaris

  • cockroach and Pila

  • Balanoglossus and Herdmania


C.

cockroach and Pila

Haemocoel is the body cavity of most of the vertebrates, containing circulatory fluid. It is filled with blood. It is well developed in arthropodes (e.g. cockroach) and molluscs (e.g., Pila).


7.

Different colours of frog skin are controlled by:

  • hormones

  • melanocytes

  • nervous system

  • both 'a' and 'c'


A.

hormones

Hormones regulate the different colour of frog skin (under hormonal control) ,metachrosis is the condition of changing in skin colour which protect frog from enemies.


8.

Which of the following enzyme digest protein in stomach?

  • Trypsin

  • Pepsin

  • Crepsin

  • None of these


B.

Pepsin

Pepsin is an endopeptidase enzyme or protein digesting enzyme. It is produced in the stomach. It breaks down proteins into smaller peptides. It acts in acidic medium, i.e. pH 2.

Trypsin is a serin protease. It hydrolzes proteins in the digestive system of many vertebrates. It is formed in the small intestine.


9.

The slime moulds are characterized by the presence of :

  • elaters

  • pseudoelaters

  • capillitium

  • capitulum


C.

capillitium

Slime moulds are characterized by the presence of capillitium. It is a branched system of sterile fibres present inside the fruit body. Elaters and pseudoelaters are present in some bryophytes whereas capitulum is a type of inflorescence.


10.

Ecdysone is secreted from:

  • insecta

  • trematoda

  • nematoda

  • polycheta


A.

insecta

Ecdysone is a steroid hormone. It controls moulting and metamorphosis in insects. It is a major insect moulting hormone.