structural specialization

Simple epithelium may sometimes become modified for some specific functions. Two such modifications are very common, namely, ciliated epithelium and glandular epithelium. Ciliated epithelium is always a modification of columnar epithelium. Here, the cells are characterized by the presence of numero..

.8 - Cell Structure of Cyanobacteria The planktonic forms contain gas vacuoles in their cells to help in floating. Some cyanophycean members possess special types of cells called heterocysts, as in Anabena and Nostoc. They are large, thick walled, round cells without a nucleoid...

A sperm is a haploid male gamete which fuses with the ovum to form the diploid zygot..

Leaf buds are structures specially meant for vegetative reproduction. These are seen in plants like Bryophyllum or Begonia. In Bryophullum, the leaf buds are seen in the margin. They produce adventitious roots below and shoot system above. As a result many plants may be obtained..

Permanent Tissues - These tissues are derived from meristematic tissues. They have lost the power of dividing, having attained their definite form and size. In their earlier stages the cells are more or less similar in structure but slowly they become specialized and form perman..

Roots sometimes have special functions to perform and in such cases their form and structure differ from those of normal roots. The modified roots may be underground or aeria..

These tissues are derived from meristematic tissues. They have lost the power of dividing, having attained their definite form and size. In their earlier stages the cells are more or less similar in structure but slowly they become specialized and form permanent tissues. T..

In case of coronary thrombosis, the damaged vessel has to be reconstructed. This is done by using a synthetic tube made of Teflon or woven Dacron. A special device called stent, which is a spring coil like structure made of stainless steel, which is placed in an artery through a..

Permanent tissues are derived from meristematic tissues. They have lost the power of dividing, having attained their definite form and size. In their earlier stages the cells are more or less similar in structure but slowly they become specialized and form permanent tissues. The..

This takes place in aquatic microorganisms such as bacteria, protozoans, diatoms, etc. Microphagous animals are sponges, corals, tadpoles, larvae of mosquitoes, etc. These animals have specialized structures for steering the water currents such as pseudopodia, cilia, flagella, ..