The below mentioned article provides a note on pollen-pistil interaction. It is an essential step of fertilisation of angiosperms. It determines compatibility and incompatibility. This interaction have been studied at a molecular and cellular level in relatively few families. It is a dynamic process involving pollen recognition followed by inhibition or promotion of pollen. The events from the deposition of [...]
The following points highlight the five important drugs that are obtained from plants. The important drugs are: 1. Opioids 2. Cannabinoids 3. Coca Alkaloid or Cocaine 4. Hallucinogens 5. Tobacco. Drug # 1. Opioids: Opioids or opiates are drugs that bind to opioid receptors present in human central nervous system and gastrointestinal tract. These have narcotic, analgesic, sedative and astringent [...]
Object: To demonstrate the phenomenon of diffusion. Requirements: Beaker, water, copper sulphate crystals. Method: Take a clean beaker and fill it completely with water. Place a big crystal of copper sulphate on one side of the beaker (Fig. 1). Observations: After some time, crystal of copper sulphate disappears and its particles get equally distributed throughout the water. Results: Molecules of [...]