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 isÂ
marginal
basal
free centralÂ
free centralÂ
An element playing important role in nitrogen fixation isÂ
Molybdenum
copper
manganese
manganese
One example of animals having a single opening to the outside that serves both as mouth as well as anus isÂ
Octopus
Asterias
Ascidia
Ascidia
The chief water conducting elements of xylem in gymnosperms areÂ
vessels
fibres
tansfusion tissue
tansfusion tissue
D.
tansfusion tissue
The tracheids are elongated, angular dead cells with hard lignified wide lumen and narrow end walls. The walls of tracheids posses different types of thickenings and the unthickened areas of its wall allow the rapid movement of water from one tracheid to another. Tracheids are the characteristic cells types of xylem tissue in gymnosperms and pteridophytes, where they are chief elements of water conduction.
Membrane -bound organelles are absent inÂ
Saccharomyces
Streptococcus
Chlamydomonas
Chlamydomonas
The kind of epithelium which forms the inner walls of blood vessels isÂ
cuboidal epithelium
columnar epithelium
ciliated columnar epithelium
ciliated columnar epithelium
Which one of the following has its own DNA?
Mitochondria
Dictyosome
Lysosome
Lysosome
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