Multiple Choice Questions

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Anaerobic respiration is also called :

  • restoration

  • fragmentation

  • multiplication

  • fermentation


D.

fermentation

Anaerobic respiration is respiration using electron acceptors other than molecular oxygen (O2).

After glycolysis, if oxygen is absent (anaerobic respiration), the pyruvic acid forms ethyl alcohol (C2H5OH) and carbon dioxide (CO2) without the help of any cell organelle. This anaerobic process is called fermentation.


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Mesophyll cells, which liberate malic acid at night time, are of :

  • C4 - plants

  • C3 - plants

  • C2 - plants

  • C1 - plants


The first heart sound is produced when :

  • diastole begins

  • semilunar valve close quickly

  • interventricular pressure decreases

  • bicuspid and tricuspid valve close quickly


Asthma is caused due to :

  • infection of lungs

  • infection of trachea

  • bleeding into pleural cavity

  • spasm in bronchial muscles


The name of process of aerobic respiration, in which energy is provided in steps in electron transport chain, is :

  • EMP-pathway

  • decarboxylation

  • photophosphorylation

  • oxidative phosphorylation


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A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called :

  • tidal volume

  • vital capacity

  • inspiratory reserve volume

  • expiratory reserve volume


Biological oxidation in Krebs cycle involves :

  • O2

  • N2

  • CO2

  • SO2


Photorespiration in C3 -plants starts from :

  • glycine

  • glycerate

  • phosphoglycolate

  • phosphoglycerate


The plants respond to photoperiods due to the presence of :

  • enzymes

  • stomata

  • phytochromes

  • phytohormones


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Rate of heart beat is determined by :

  • AV-node

  • SA-node

  • Purkinje fibres

  • Papillary muscles