The tissue present in all organs of plant is
The parenchyma is widely distributed in plant body such as stem , roots, leaves, flowers and fruits. The parenchyma tissue is found in the soft parts of the plants such as cortex of roots, ground tissue in stems & mesophyll of leaves. It is also distributed in pith , medullary rays & packing tissue in xylem and phloem.
Arrange the following plants in ascending order based on the number of xylem strands in their roots :
Trapa < Nicotiana < Pisum < Castanea
Reticulate veination is a characteristic in
The veins vary in thickness in the reticulate venation of the dicot leaves.
Vascular bundles in which cambium is present between xylem and phloem is called as
Vascular bundles in which cambium is present between xylem and phloem is called open vascular bundles and those in which cambium is absent is called closed vascular bundles.
Which meristem contributes to the formation of the primary plant body?
Both apical meristems and intercalary meristems are primary meristems because they appear early in life of a plant and contribute to the formation of the primary plant body.
In angiosperms, vascular tissue develop from
In angiosperms, vascular tissue develop from plerome. Pleromeform the central core of the primarymeristem of a plant or plant part.
Select the CORRECT statement.
Secondary growth occurs in most seed plants, but monocots usually lack secondary growth. If they do have secondary growth, it differs from the typical pattern of other seed plants. The formation of secondary vascular tissues from the cambium is a characteristic feature of dicotyledons and gymnosperms.
In angiosperms, main water and mineral transporting elements are
Tracheids are the chief water-conducting elements in gymnosperms and seedless vascular plants. They can also be found in angiosperms. Tracheids are elongated cells, closed at both ends.
Sclereids belong to
Sclereids belong to sclerenchyma complex permanent tissue present in hard parts of plants. They are generally hard and found in rough fruits and stem.
Which epidermis of leaf contains more stomata?
Correct Answer :- a
Explanation : The stomata are more numerous over the abaxial (lower) epidermis of the leaf than the (adaxial) upper epidermis. An exception is floating leaves where most or all stomata are on the upper surface. Vertical leaves, such as those of many grasses, often have roughly equal numbers of stomata on both surfaces. The stoma is bounded by two guard cells.
Bulliform or motor cells are present in
In isobilateral leaves of monocot, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells.
Exarch xylem is present in
Exarch xylem is the arrangement in which the protoxylem (the first formed primary xylem cells in a plant shoot/root) is directed towards the periphery and metaxylem (later formed primary xylem cells in a plant shoot/root) is directed towards the centre. Its development follows a centripetal pattern and is characteristics of roots.
Thus the correct answer is option D.
The parenchymatous cells which lie between the xylem and the phloem are called
The parenchymatous cells which lie between the xylem and the phloem are conjunctive tissue.
Jute fibers deteriorate because they have
Jute fibers are made of high amount of lignin that deteriorate in presence of high moisture and water,
In arborescent monocots stem, a secondary cambium growing in the following type of vascular bundle is seen in
It is the anatomy of monocotyledonous root.
In arborescent monocots stem, a secondary cambium grows in
In arborescent monocots stem, secondary cambium grows in hypodermal region for secondary growth that increase the girth of the stem.
Specialised parenchymatous cells, which are closely associated with sieve tube elements is
The companion cells are specialised parenchymatous cells, which are closely associated with sieve tube elements. The sieve tube elements and companion cells are connected by pit fields present between their common longitudinal walls.
In monocotyledons, guard cell of stomata are
In monocotyledons, the guard cell of stomata are dumb-bell shaped, thicker on top and bottom and thinner in the middle.
Tunica corpus theory is connected with
Schmidt in 1924 postulated tunica- corpus theory on the basis of studies of shoot apices of angiosperm. This theory is concerned with planes of cell division in the apex. In contrast to apical cell theory and histogen theory tunica-corpus theory is applicable only to shoot apex and not to root.
Which type of vascular bundle is shown in figure below
The vascular bundle shown below is closed and conjoint as cambium is absent between xylem and phloem tissue.
The meristems which occur at the tips of roots and shoots and produce primary tissues are called
Plants have different kinds of meristems. The meristems which occur at the tips of roots and shoots and produce primary tissues are called apical meristem.
Which one function is referred as “Biological check post” ?
Endodermis forms the outermost layer of vascular bundles. Anything entering inside the plant body must cross the endodermis to be transported via xylem and phloem. So, endodermis is called as biological check post of the cell.
Stem of grasses and related plants elongate by the activity of
Grasses belongs to monocotyledonous angiosperms in which secondary growth do not occurs. Plants elongate by the activity of both apical and intercalary meristem.
In dicot stems, the cells of cambium present between primary xylem and primary phloem is
In dicot stems, the cells of cambium present between primary xylem and primary phloem is intrafascicular cambium.
A group of cells having a common origin and usually performing a common function is
A tissue is a group of cells having a common origin and usually performing a common function.