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Practice each question, then open the answer or worked solution.
Product of photosynthesis is transported from the leaves to various parts of the plants and stored in some cells before being utilised. What are the cells/ tissues that store them?
Parenchyma, which is thin and made up of cellulose, stores the product of photosynthesis before being transported or utilized by the various parts of the plants.
Protoxylem is the first formed xylem. If the protoxylem lies next to the phloem, what kind of arrangement of xylem would you call it?
If the protoxylem lies next to the phloem, this type of arrangement of the xylem is known as Exarch, which is present in the roots.
What is the function of phloem parenchyma?
The function of phloem parenchyma is to store food material and other substances like resins, latex and mucilage and also help in the translocation of foods.
What is present on the surface of the leaves which helps the plant prevent loss of water but is absent in roots?
The cuticle is present on the surface of the leaves, which helps the plant prevent the loss of water. The cuticle is absent in roots.
What is the epidermal cell modification in plants which prevents water loss?
The epidermal cell modification in plants which prevents water loss is known as Bulliform Cells.
What part of the plant would show the following?
a. Radial vascular bundle
b. Polyarch xylem
c. Well developed pith
(a) Radial Vascular bundle is present in roots. The Radial Vascular bundle includes the xylem and phloem, and these are present in separate radii of the roots.
(b) Polyarch xylem is present in monocot root. When many strands of xylem are present, it is referred to as polyarch condition-a characteristic feature of monocot root.
(c) Well-developed pith is present in dicot stem and monocot roots. Dicot stems and monocot roots have well-developed pith formed of the parenchymatous cell with intercellular spaces.
What are the cells that make the leaves curl in plants during water stress?
The cells that make the leaves curl in plants during water stress are Bulliform cells. The epidermal cell modification in plants which prevents water loss is known as Bulliform Cells.
What constitutes the cambial ring?
Interfascicular cambium and Intrafascicular cambium constitutes cambial ring. It is formed due to the meristematic activity of cambium.
Give one basic functional difference between phellogen and phelloderm?
The basic functional difference between phellogen and phelloderm is:
Phellogen is a meristematic tissue and Phelloderm is a permanent tissue. Phellogen is called as Cork Cambium, and Phelloderm is called Secondary Cortex.
Arrange the following in the sequence you would find them in a plant starting from the periphery – phellem, phellogen, phelloderm.
Phellem → Phellogen → Phelloderm
Phellem or cork is the outermost layer, followed by phellogen (cork cambium) which in turn is followed by phelloderm (secondary cortex).