In unilocular ovary with a single ovule, the placentation is
marginal
basal
free central
free central
B.
basal
In basal placentation, the ovary is bicarpellary, syncarpous and unilocular and a single ovule is borne at the base of ovary, eg, marigold.
In marginal placentation, the ovary is simple unilocular and the ovules are arranged along the margin of ovary eg, pea.
An element playing important role in nitrogen fixation is
Molybdenum
copper
manganese
manganese
The kind of epithelium which forms the inner walls of blood vessels is
cuboidal epithelium
columnar epithelium
ciliated columnar epithelium
ciliated columnar epithelium
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
Which one of the following structures between two adjacent cells is an effective transport pathway?
Plasmodesmata
Plastoquinones
Endoplasmic reticulum
Endoplasmic reticulum
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
