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Endothelium - Ovule
In plants bearing unitegmic ovules, the nucellus degenerates during early stages of ovule development and the embryo sac comes in contact with the innermost layer of the integument. The cells of this layer become specialised to supply nutrients to the embryo sac. These cells elongate radially, their cytoplasm becomes dense and store starch and lipids. This specialised layer is called endothelium. Endothelium is also reported in some bitegmic ovules. Tapetal cells are similar to endothelium cells of anther in storing carbohydrates, proteins, RNA, ascorbic acid and other metabolites; it is secretory in function is hence referred to as the integumentary tapetum.
Explain process to Control of Breathing? The rate of breathing is controlled by the medulla, the segment of brain stem just above the spinal cord. If the brain stem is cut just
REGUL A TIV E THEORY It was propounded by Hens Driesch. He performed experiments on the eggs of sea urchin similar to the experiments performed by Roux. He observed
Snakes Non-poisonous snakes can be brought into the classroom for observation. The diagram shows how a safe cage can be made for keeping a snake. The bottom should be covered w
Describe the factors that are involved in the regulation of respiration in a child who decides to hold his/her breath for as long as possible.
describe the mechanism of allosteric change.
Quantitative Characters - Population Density Density denotes the average number of individuals of a particular species in a unit area. In other words, it represents the numeri
what is meant by double penetration sex?
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diagram of dna replication
Glands A cell, tissue or organ which secretes specific chemical secretion is known as a gland. The glands develop from the epithelium tissues. The glands are classifi
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