Answer:
"In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure"
Explanation: I just looked it up-
Answer:
1. Earth's temperature is maintained by re radiated infra red radiation by green green house gases and slightly by water vapors in atmosphere. These gases prevent heat from escaping to outer space, so are functionally comparable to glass panel of green house. Thus, this heating effect is referred to as green house effect. Carbon dioxide is a green house gas so increased amount of this gas in the atmosphere will result in increased atmospheric temperature and global warming.
2. Three sources of atmospheric carbon dioxide are:
- Volcanic eruption
- Respiration by plants and animals
- Decomposition of organic substance.
Explanation:
- <u>Overall rise in temperature </u>of the Earth due to excessive amount of green house gases in atmosphere that trap heat radiating from Earth's surface is called Global warming.
- Global warming can cause melting of ice caps, alteration of seasons, destruction of forest and increase in deserts.
- Green house gases include carbon dioxide, methane, ozone, nitrous oxide, and nitrogen dioxide etc.
- Among all these gases Carbon dioxide is the major component that is responsible for global warming.
- Carbon dioxide is added to the atmosphere by burning of fossil fuels, volcanic eruption and respiration. But Burning of fossil fuels itself adds about 18 X 10¹² tonnes of CO₂ anually.
- Global warming has become a major environmental concern now and needs to be controlled immediately.
Answer:
Free nitrogen is important for the living organism becuse nitrogen helps to build the structure of various biomolecules such as amino acids,proteins and nucleic acids such as DNA and RNA.
Explanation:
Importance of free nitrogen in case of animals
Nitrogen is an important constituent of porphyrin ring present in the hemoglobin protein protein which play a significant role in the transport of oxygen and carbon dioxide gas.
Nitrogen is also important in cell growth,repair and tissue development.We cannot intake the atmospheric nitrogen.Nitrogen is acquired by us through the consumption of protein rich diet.
Importance of free nitrogen in case of plants
Nitrogen is an important component of the chlorophyll pigment present in the leaves which helps in photosynthesis a process that deals with the formation of glucose by the utilization of sunlight.
Some parts of the energy rich compound Adenosine triphosphate is made up of Nitrogen.
I think that the answer is C. roots. I hope that this helps. If it does vote me brainliest please!!
