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Composite Endosperm - Variants of Endosperm
In the family Loranthaceae, the development of endosperm is unique. The ovary lacks ovules. The sporogenous tissue located at the base of ovary develops several embryo sacs which elongate considerably, some of them even entering the style. After fertilization, the primary endosperm nucleus of each embryo sac moves to the basal part where it divides to form cellular endosperm. During further development, the endosperms of all the embryo sacs in an ovary enlarge and become fused to produce a composite endosperm mass. Several proembryos belonging to individual embryo sacs with long suspensors develop but only one survives and attains maturity.
Define the Coenzyme activity of nicotinic acid? Nicotinamide exists within the redox-active coenzymes, nicotinamide adenine dinucleotide (NAD) and its phosphate (NADP), which
What are the three phases into which the HIV infection is often divided? The HIV infection is often separated into three phases: the acute phase, from the infection to 1 until
Explain the Filtration - Air Sampling? Filtration - Air stream may also be filtered through a micro-filter. Microorganisms are released from the filter using a suitable diluen
Accidents and Losses Accident can be considered as an incident occurring without intention and results in injury, loss of body part or even death of a human being or a few per
Honey comes under the purview of Prevention of Food Adulteration Act (PFA). Due to its limited production and high cost, honey is prone to adulteration by cane sugar, invert sy
What are the Luria's methods and theories Adhering to our theory that the Luria Nebraska bears little resemblance to Luria's methods and theories, there seems little point in i
What is Biochemical Characteristics? In the last section we have learnt about the importance of biochemical tests. It must be clear now that biochemical tests are used to -
SIMILARITIE S BETWEEN APES AND MAN - Absence of tail. Broadened chest due to flattening of sternum Smaller lumber region due to reduced number of lumbar vertebrae
The secretary coil fills the lumen with a NaCl solution that is isotonic with the blood plasma. As this solution moves upward through the reabsorptive duct, NaCl is reabsorbed into
ENDOPLASMIC RETICULUM It is also known as Endoskeleton of the cell, Endomembranous system of the cell. Garnier (1897) first observed them and called Ergastoplasm. E.R.
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