Multiple Choice QuestionsWhich one of the following structures between two adjacent cells is an effective transport pathway?
Plasmodesmata
Plastoquinones
Endoplasmic reticulum
Endoplasmic reticulum
In unilocular ovary with a single ovule, the placentation is
marginal
basal
free central
free central
An element playing important role in nitrogen fixation is
Molybdenum
copper
manganese
manganese
One example of animals having a single opening to the outside that serves both as mouth as well as anus is
Octopus
Asterias
Ascidia
Ascidia
The chief water conducting elements of xylem in gymnosperms are
vessels
fibres
tansfusion tissue
tansfusion tissue
Membrane -bound organelles are absent in
Saccharomyces
Streptococcus
Chlamydomonas
Chlamydomonas
The kind of epithelium which forms the inner walls of blood vessels is
cuboidal epithelium
columnar epithelium
ciliated columnar epithelium
ciliated columnar epithelium
Which one of the following has its own DNA?
Mitochondria
Dictyosome
Lysosome
Lysosome
A.
Mitochondria
In mitchondria, the inner membrane space is filled with a matrix which contains dense granules along with ribosomes and mitchondrial DNA.The mitochondrial DNA is circular in nature. There number varies from 2-6.Besides DNA, a mitochondrion has RNA and its ribosomes also. Thus, a complete protein synthesizing machinery is present in mitcochondria, which suggeststhe semi -autonomuous nature of mitochondria Dictyosome, lysosome and peroxisome do not have their own DNA.
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