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Gymnosperms are also called soft wood spermatophytes because they lack :
As secondary growth proceeds, in a dicot stem, the thickness of
Water containing cavities in vascular bundles are found in :
Stem of maize has water containing cavities in vascular bundles.
Companion cells are closely associated with :
Companion cells are narrow, elongated and thin walled living cells. They lie on the sides of the sieve tubes and are closely associated with them through compound plasmodesmata. It is supposed that the nuclei of the companion cells control the activities of the sieve tube through plasmodesmata. Companion cells also help in maintaining a proper pressure gradient in the sieve tube elements.
The length of different internodes in a culm of sugarcane is variable because
Which part would be most suitable for raising virus-free plants for micropropagation ?
Meristem is most suitable for raising virus free plants for micropropagation.
The common bottle cork is a product of:
The common bottle cork is the product of phellogen.Phellogen produces cork or phellem on the outer side. It consists of dead and compactly arranged rectangular cells that possess suberised cells walls. The cork cells contain tannins. Hence, they appear brown or dark brown in colour. The cork cells of some plants are filled with air e.g., Quercus suber (Cork Oak or Bottle Cork).
Some vascular bundles are described as open because these
Open means presence of cambium during secondary growth. Vascular cambium divides to form secondary xylem towards inner side while secondary phloem towards outside.
Function of companion cells is
Function of companion cell is to load sugar and amino acids into sieve elements. These cells use transmembrane proteins to take up by active transport.
Which one of the following is wrongly matched?
Smut is a disease of cereals, corn, grasses and sorghum caused by many species of fungi.