Which of the following statements is true?
Vessels are enlongated, multicellular water conducting channels with wide lumen formed by end to end fusion of a large number of vessel elements. Tracheids are elongated dead cells with tapering ends having lignified walls and large or wide lumen. Their main function is conduction of water and minerals from root to leaf.
Which of the following cells are found in the long, tough celery?
The long, tough strands found in celery are made up of collenchyma.
Which of the following stores tannins?
Xylem parenchyma stores food materials in the form of starch,fat and other substances like tannins.
Which of the following provides mechanical support to the plant organs?
Sclerenchyma provides mechanical support to organs.
Best method to determine the age of tree is to
By counting the number of annual rings at base stem of a tree the age of the tree can be determined.
Heartwood differs from sapwood in:
Heartwood differs from sapwood in having dead and non-conducting elements. In old trees, the inner region that comparises dead elements with higly lignified walls is called heartwood. Heartwood does not conduct water but gives mechanical support to the stem. On the other hand, the peripheral region, which is lighter in colour are called Sapwood. It is involved in the conduction of water and minerals from root to leaf.
The cork cambium, cork and secondary cortex are collectively called :
Phellem (cork), phellogen(cork cambium) and phelloderm (cotex) are collectively called periderm.
Which of the following helps in gas exchange?
Parenchymatous cells rupture and form lens shaped openings called lenticels, which permit the exchange of gases between the outer atmosphere and the internal tissue of the stem.
Cuticle is secreted by
Waxy outermost lining, which is secreted by epidermis.
Which is absent in plants ?
Nervous system is present in animals.
Which of the following is the part of complex tissue?
The complex tissues are made of more than one type of cells and these works together as a unit. Xylem is a complex tissue.
Collenchyma differs from parenchyma in having
In collenchyma cell walls show localized thickenings due to presence of approximately 45% pectin, 35% hemicellulose and 20% cellulose.
Which of the following is not a part of ground tissue system?
All tissues in the plant except epidermis and vascular bundles constitute the ground tissue.
Vessels are found in
Generally gymnosperms do not have vessels but a few gymnosperms having vessels are Ephedra, Gnetum etc.Most of angiosperms have vessels except of few e.g., Trochodendron.
In barley stem, vascular bundles are:
In barley stem, vascular bundles are closed and scattered. They are open only for a hour in the day time and never open at night. E.g Cereals.
Which of the following is an example of intercalary meristem?
Intercalary meristem occurs in grasses and regenerated parts removed by the grazing herbivores.
Function of storage is performed by
Parenchyma storage of food materials e.g., carrot, beet root, etc.
Which is the correct fact about diffuse or ring porous wood ?
Ring porous wood is more advanced than diffuse porous wood as it provides for better translocation when requirement of plant is high.
An organised and differentiated cellular structure having cytoplasm but no nucleus is
Internally, sieve tubes possess peripheral layer of cytoplasm and are devoid of nucleus. They are living cells. Cell walls of sieve tubes are thickened than surrounding parenchyma cells.
Which tissue is useful in floating on the water?
Some groups of parenchyma cells are loosely packed together with connected air spaces. These types of cells are called aerenchyma tissue.
Which of the following is known as piliferous layer?
Epiblema is the outermost covering of the root. Cuticle and stomata are absent in epiblema and hence they produce long unicellular projections called root hairs. Hence, it is also known as piliferous layer.
Collenchyma occurs in the stem and petioles of
Collenchyma provides mechanical strength to young dicot stems, petioles and leaves.
Which is correct about transport or conduction of substances ?
Sieve tubes are long distance channels for transport of organic nutrients. The moement of the nutrients are bidirectional.
Pericycle of root produces
Pericycle of roots is active in the formation of root branches or lateral roots.
Which of the following is not the characteristic feature of monocot root?
Monocot roots have thin walled cells in the epiblema, unicellular root hairs, and distinct pith. But they do not have cuticle and stomata.
Which of the following season is best to study about low density wood?
During spring, woods are lighter in colour and have lower density. In this season, cambium is active and produces a large number of xylary elements having vessels with wider cavity.
Walls of sclerenchyma are
They possess hard and extremely thick secondary walls due to uniform deposition of lignin.
Which of the following plant part contains conjoint type of vascular bundles?
The conjoint type of vascular bundles is common in stems and leaves. Roots contain radial type of vascular bundles.
Chloroplast containing parenchyma is called
Chloroplast containing parenchyma(chlorenchyma) are mostly present in leaf.
Which meristem helps in increasing girth ?
Lateral meristem occurs on the sides of stem and help in increasing girth of stem and root. It divides only periclinally or radially and is responsible for increase in girth or diameter.
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