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Answers
Answer:
Q1)
(i) Many glands make up the endocrine system.
(ii) Hormones are chemical substances that act like messenger molecules in the body.
(iii) Adolescence is the period of transition between childhood and adulthood.
(iv)A Zygote is formed by the fusion of two gametes.
(v) Chromosomes are thread-like structures located inside the nucleus of animal and plant cells.
Q2)
Ans. The adrenal glands (also known as suprarenal glands) are endocrine glands that produce a wide variety of hormones. They are found above the kidneys and consist of a number of different layers that directly influence the structure and function of the glands. They are paired.
Q3)
Ans.
- adrenocorticotropic hormone, which stimulates the adrenal glands to secrete steroid hormones, principally cortisol.
- growth hormone, which regulates growth, metabolism and body composition.
Q4)
Ans. The period during which adolescents reach sexual maturity and become capable of reproduction is defined as Puberty.
Q5)
Ans. To become infected with HIV , infected blood, semen or vaginal secretions must enter your body. This can happen in several ways: By having sex. You may become infected if you have vaginal, anal or oral sex with an infected partner whose blood, semen or vaginal secretions enter your body.
Q6)
Ans. The use of illegal drugs or the use of prescription or over-the-counter drugs for purposes other than those for which they are meant to be used, or in excessive amounts. Drug abuse may lead to social, physical, emotional, and job-related problems.
Q7)
Ans. Adolescence begins with the onset of physiologically normal puberty, and ends when an adult identity and behaviour are accepted. This period of development corresponds roughly to the period between the ages of 10 and 19 years, which is consistent with the World Health Organization's definition of adolescence.
Q8)
Ans.
- Alcohol
- Nicotine
- Inhalants
Q9)
Ans. Amoeba is a unicellular organism, and just like bacteria, it reproduces through binary fission. After replicating its genetic material through mitotic division, the cell divides into two equal-sized daughter cells.
Q10)
Ans. CNG - Compressed Natural Gas
Q11)
Ans. All the gases which undergoes combustion produces flame. But only those solids and liquid fuels which vaporise on being heated,burn with the flame. Some of the substances which burn by producing flames are LPG, CNG, biogas, wax, camphor, magnesium, kerosene oil, mustard oil.
Q12)
Ans. Material such as coal, gas, or oil that is burned to produce heat or power is termed as Fuel.
Q13)
Ans. A combustible material is something that can combust (burn) in air. Flammable materials are combustible materials that ignite easily at ambient temperatures. In other words, a combustible material ignites with some effort and a flammable material catches fire immediately on exposure to flame.
Q14)
Ans. Three things are required in proper combination before ignition and combustion can take place--- Heat, Oxygen and Fuel.
- There must be Fuel to burn.
- There must be Air to supply oxygen.
- There must be Heat (ignition temperature) to start and continue the combustion process.
Q15)
Ans. Wildfire, also called forest, bush or vegetation fire, can be described as any uncontrolled and non-prescribed combustion or burning of plants in a natural setting such as a forest, grassland, brush land or tundra, which consumes the natural fuels and spreads based on environmental conditions (e.g., wind, topography).
Q16)
Ans. A matchstick does not catch fire and burn on its own at room temperature because the ignition temperature of matchstick is higher than the room temperature. If kerosene is heated little it will catch fire easily because kerosene oil has a comparatively low ignition temperature which is reached even on little heating.
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