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Explain the endochondral ossification
The second type of osteogenesis is endochondral ossification. This process is different from intramembranous ossification in that it occurs with a cartilage base. Endochondral ossification is responsible for a good deal of formation of the long bones , vertebrae and portion of the mandible. It occurs in the following steps: Embryonic mesenchymal stem cells differentiate into a primitive hyaline cartilage. Blood vessels and bone- forming units, which resorb the cartilage and replace it with osteoid, invade this matrix.
What is connective tissue proper? The name connective tissue proper is used to assign the connective tissue that fills interstitial spaces as opposed to the specialized connect
The Intine Layer As soon as the tetrads release the microspores, the inner layer of the pollen wall (intine) is formed. Proteinaceous lamellae are embedded in the matrix of th
Define Aim of Neotaxonomy or Systematic or Biosystematics The aim of neotaxonomy or systematic or biosystematics is not only to describe, identify and arrange organisms in conv
How do grasslands differ from Savannas? Name the two main categories of plant forms that dominate the desert vegetation.
a) In what form do plants absorb calcium from the soil? b) List any two calcium deficiency symptoms in plants.
FOOD Food consists of H O, minerals, vitamins carbohydrate, lipid & protein. A person needs 1600 cal. per day. This is BMR (Basal metabolic rate). Needed 2500 cal. per
Coiling of garden pea tendrils around any support is an example of: 1. Thigmotaxis 2. Thigmonasty 3. Thigmotropism 4. Thermotaxis Thigmotropism
It is generally believed that genetic drift occurs as a result of sampling error. As we said earlier it occurs in small populations such as peripheral isolates. We may demonstrate
Define Interferons - Humoral Mechanisms Interferons are soluble proteins secreted naturally when cells become infected by foreign bodies. Infected lymphocytes release interfero
Many endangered plant species are currently being propagated by commercial growers and botanical gardens and the sold (as both plants and seeds) to government agencies. Conservatio
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