Q21. What combination of sex chromosomes produces a male human?
Q22. What is the main source of energy made through photosynthesis for plants? Q23. What is humidity?
Q24. Where is the diaphragm located in the human body?
Q25. Which one of the two minimises wastage of electricity CFL or an electric bulb?
Answers
Answer:
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Explanation:
21) Individuals having two X chromosomes (XX) are female; individuals having one X chromosome and one Y chromosome (XY) are male.
22) Photosynthesis, process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for virtually all organisms.
23) Humidity is the concentration of water vapour present in the air. Water vapor, the gaseous state of water, is generally invisible to the human eye. Humidity indicates the likelihood for precipitation, dew, or fog to be present. Humidity depends on the temperature and pressure of the system of interest.
24) The diaphragm, located below the lungs, is the major muscle of respiration. It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges.
25) CFLs are preferred over electric bulbs because they minimise the wastage of electrical energy. When electric current passes through the bulb, it not only gives light, but also gives out heat, which is not utilised. This results in the wastage of electrical energy.