(1) Explain two types of crop.
(2) Explain two types of Bacteria.
(3) Write advantages of synthetic fibers.
(4) Mention physical properties of metals.
(5) Why aluminum is used for wrapping food items?
(6) Where do we get coal and how is it formed?
(7) Why does a piece of paper burn with yellow flame?
(8) Why should we conserve bio-diversity?
(9) Write a note on National park on detail.
(10) A Black smith hammers a not piece of Iron While making a tool. How does the force due
to hammering affect piece of Iron?
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Answers
Answer:
Q1
A crop is a plant or plant product that can be grown and harvested for profit or subsistence. By use, crops fall into six categories: food crops, feed crops, fiber crops, oil crops, ornamental crops, and industrial crops. Food crops, such as fruit and vegetables, are harvested for human consumption
Q2
There are many different types of bacteria. ... Spherical: Bacteria shaped like a ball are called cocci, and a single bacterium is a coccus. Examples include the streptococcus group, responsible for “strep throat.” Rod-shaped: These are known as bacilli (singular bacillus
Q3
Synthetic fibers are more durable than most natural fibers and will readily pick-up different dyes. In addition, many synthetic fibers offer consumer-friendly functions such as stretching, waterproofing and stain resistance. Sunlight, moisture, and oils from human skin cause all fibers to break down and wear away.
Q4
Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: State: Metals are solids at room temperature with the exception of mercury, which is liquid at room temperature (Gallium is liquid on hot days).
Q5
Aluminium is malleable, soft and does not react with food items, so it is used to wrap food items. Metals are good conductor of heat and electricity, so immersion rods are made up of metallic substances
Q6
Coal is formed when dead plant matter decays into peat and is converted into coal by the heat and pressure of deep burial over millions of years.
Q7
A yellow flame comes about when there is insufficient supply of oxygen. In this case the hydrocarbons do not burn completely, the temperature of the flame is lower than that of the blue flame. The yellow flame also leaves behind a black soot or residue
Q8
Biodiversity conservation, the practice of protecting and preserving the wealth and variety of species, habitats, ecosystems, and genetic diversity on the planet, is important for our health, wealth, food, fuel, and services we depend on. Biodiversity conservation is vital for economic growth and poverty reduction.
Q9
A national park is a park in use for conservation purposes, created and protected by national governments. Often it is a reserve of natural, semi-natural, or developed land that a sovereign state declares or owns. The National Park Service preserves unimpaired the natural and cultural resources and values of the National Park System for the enjoyment, education, and inspiration of this and future generations.America's national parks were established to preserve our country's greatest collection of natural, historic, and cultural treasures. The National Park Foundation is dedicated to the promise that our national parks, and all they possess, are protected forever.
Q10
A blacksmith hammers on the hot iron, he applies force. This applied force changes the shape of iron.