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Emboly Movement - Involution
It denotes turning in or rolling over. Involution of mesodermal blastomeres has been observed in Amphioxus, reptiles, monotremes, amphibians, buds, and even in some eutherian mammals. Throughout gastrulation in the amphibians the blastomeres situated on the margin of the lip of blastopore roll over the lip (involute) to turns into internal. In the bird embryo the cells situated on the posterior margin of the blastoderm roll over (involute) to from the lower layer termed as the hypoblast and the presumptive mesodermal and endodermal cells situated on the surface of the blastoderm reach the interior by turning in by the groove of the primitive streak.
Central Nervous System (CNS) Covering of the brain and spinal cord is called Meanings (membranes which cover and protect brain and spinal cord are called meanings) There is flu
It is made up of three cusps, anterior, posterior and septal. The septal cusp is attached to the medial margin. The anterior cusp is attached to the superior-lateral part of the ma
Community Change Ecosystems are dynamic entities in which a number of events take place. Associated with the biotic communities of the ecosystem are some changes, which may be
Hydrocele A hydrocele is a painless water-filled cyst found in front of the testis.It is brightly translucent and cannot be emptied by pressure of a 'flap valve' at its jun
Q. What are the angiosperms, the flowering plants? What is the major feature that distinguishes them from the gymnosperms? Flowering plants have seeds and flowers (phanerogamic
An element playing significant role in nitrogen fixation is : 1. Molybdenum 2. Copper 3. Manganese 4. Zinc An element playing significant role in nitrogen fixation
Define Functions of sodium and chloride? So far you have learnt that most minerals participate in important functions of body as they support the activity of specific enzymes.
Overgrazing - Degradation of Ecosystem It refers to the condition when the grazing pressure on the vegetation is so intense that it does not recover. Ultimately, there is a lo
Self-Pollination - Types of Pollination Self-pollination refers to the transfer of pollen grains from the anther to the stigma of the same flower. In chasmogamous flowers the
Explain what is Enzymes? Enzymes are organic substances that speed up, or catalyze, a chemical reaction. At a given temperature, molecules have varying amounts of energy, and
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