During prophase I, each of the homologous pairs of chromosomes can be seen as bivalent or as a grouping of two chromosomes said to be sister chromatids. The site at which the crossing over occurs on the sister chromatids is known as the chiasma. Prophase I is the longest phase during the meiosis process and takes up to 90 percent of the total time of cell division.
Castor beans are pressed to extract castor oil which is used for medicinal purposes. Ricin (a toxic substance present in the plant) does not partition into the oil because it is water-soluble, therefore, castor oil does not contain ricin, provided that no cross-contamination occurred during its production.icin (a toxic substance present in the plant) does not partition into the oil because it is water-soluble, therefore, castor oil does not contain ricin, provided that no cross-contamination occurred during its production.
About. Known for its plethora of benefits and uses, castor oil is a vegetable oil squeezed out from the seeds of castor plant, Ricinus communis, found in Africa and India. But use of castor oil is limited not only to India, it is used all over the world for its medicinal properties.As a home remedy, castor oil is used widely for a number of problems and ailments. To name a few, castor oil helps deal with problems related to hair, skin, joints and intestine.bout. Known for its plethora of benefits and uses, castor oil is a vegetable oil squeezed out from the seeds of castor plant, Ricinus communis, found in Africa and India. But use of castor oil is limited not only to India, it is used all over the world for its medicinal properties.