Multiple Choice QuestionsWhich one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?
One can breathe out air totally without oxygen
One can breathe out air through eustachian tubes by closing both the nose and the mouth
One can consously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
One can consously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
Which one of the following statements is totally wrong about the occurrence of the notochord, while the other three are correct?
It is present only in larval tail in Ascidians
It is replaced by a vertebral coloumn in adult frog
It is absent throughout life in humans from the very beginning
It is absent throughout life in humans from the very beginning
C.
It is absent throughout life in humans from the very beginning
The notochord is a flexible, rod -shaped body found in the embryo of all chordates. It is composed of cells derived from the mesoderm. It represents the primitive axis of the embryo. In some chordates, it persists throughout life as the main axial support of the body (e.g. Amphibians), while in most vertebrates including humans it becomes the vertebral body of the vertebral column.
The cells lining the blood vessels belong to the category of
smooth muscle tissue
squamous epithelium
columnar epithelium
columnar epithelium
The pathogen Microsporum responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of
Taenia, a tapewarm
Wuchereria, a filarial worm
Rhizopus, a mould
Rhizopus, a mould
At metaphase, chromosomes are attached to the spindle fibres by their
satellites
Secondary constrictions
Kinetochores
Kinetochores
One of the constituents of the pancreatic juice while poured into the duodenum in humans, is
Trypsinogen
chymotrypsin
trypsin
trypsin
Frogs differ from humans in possessing
paired cerebral hemispheres
chymotrypsin
trypsin
trypsin
Function of copanion cells is
providing energy to sleve elements for active transport
Providing water to phloem
loading of sucrose into sieve elements by passive transport
loading of sucrose into sieve elements by passive transport
Some vascular bundles are described as open because these
are surrounded by pericycle but no endodermis
are capable of producing secondary xylem and phloem
Possess conjunctive tissue between xylem and phloem
Possess conjunctive tissue between xylem and phloem
In mitochondria, protons accumulate in the
outer membrane
inner membrane
intermembrane space
intermembrane space
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