Answer:
Explanation:
Staining is done for onion cells to visualize the cytoplasm of yellow and white onions because they are not pigmented. The staining of human cheek cells with methylene blue is necessary to stain the nucleus to get clear image of it under microscope because methylene blue binds to negative charge nucleic acids
While for leaf epidermal cells smears, staining is not necessary as they are visible under light microscope without staining and they also have pigmented materials inside them such as chlorophyll chloroplast. The cork cell is a non-living and have a cell wall whose structure is visible under light microscope.
Answer: bidirectional regulator
Explanation:
Answer:
Germs
Explanation:
Vaccines are made from the same germs (or parts of them) that cause disease; for example, polio vaccine is made from polio virus.
Group 15 is called the nitrogen group. The first two elements in this group are nonmetals. These are followed by two metalloids and one metal. All the elements in the nitrogen group have five valence electrons, but they vary in their reactivity.
Answer:
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Explanation:
A xerophile (from Greek, Modern xēros, meaning 'dry', and philos, meaning 'loving'. It is a plant that thrives in dry environment such as desert. It is an organism that can grow and reproduce in conditions with a low availability of water,
Examples of xerophiles include Trichosporonoides nigrescens and cacti. There are many types of cacti. Trichosporonoides nigrescens is the scientific name of one of them.