The heart is covered by
epicardium
pericardium
supracardium
endocardium
B.
pericardium
The heart is covered by pericardium. The pericardium is a double-walled sac containing the heart and the roots of the large vessels. It has two layers, a serous layer and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid. The pericardium fixes the heart to the mediastinum, gives protection against infection, jerk or shock and provides the lubrication for the heat.
C4 pathway is advantageous over C3 pathway in plants as it
occurs in relatively low CO2 concentration
uses more amount of water
occurs in relatively low O2 concentration
is less efficient in energy utilisation
The eukaryotic cells have all of the followings except
peptidoglycan in the cell wall
the 80 S ribosome
nuclear membrane
mitochondria
Which one of the followings is the functional unit of hearing?
Utricle
Organ of Zuckerkandl
Organ of Corti
Vestibular apparatus
Which one of the following statements is incorrect?
Insects have one pair of antenna
Millipeds possess two pairs of appendages in each segment of the body
Prawns have two pairs of antenna
Animals belonging to the phylum- Porifera have nematocys
Vernalisation promotes flowering by
low temperature
high temperature
prolonged photoperiod
short photoperiod
Which one of the followings is not a refractive medium of the eye?
Lens
Vitreous humour
Aqueous humour
Pupil
Which of the followings does not occur in the interphase of eukaryotic cell division?
Increase of ATP synthesis
Increase of DNA synthesis
Increase of RNA synthesis
Reduction in cell size
TCA cycle enzymes are located in
cristae
outer membrane
mitochondrial matrix
mitochondrial intermembrane space
Which one of the followings is not a characteristic feature of mammals?
Diphyodont tooth
Ten pairs of cranial nerves
Seven cervical vertebrae
Left aortic arch in the circulatory system
