1. Fill in the blanks
a ____helps in setting of Curd.
b. Like synthetic fires, plastic is also a___
c. Least polluting fuel for vehicle is___
d. ____was formed from organisms living in the sea.
e. Burning of wood and coal causes of air____
2. Give reasons.
a. LPG is a better domestic fuel than wood.
b. Plastics are a materials of choice.
c. If your father has brown eyes, you may also have brown eyes.
d. Goldsmiths use outermost zone to meit gold and silver.
e. Water shouldn't be used to extinguish fire caused due to electricity or oil.
3. Answer the following in short.
a. What is carbonisation?
b. Write down a difference between eukaryotes
c. What happens when charcoal burns?
d. Write down the uses of the products obtained from coal tar.
e. Why can cold treatment preserve our food?
4. Write down the functions or uses of the following.
a. Plastids
b. PET
c. Nuclear membrane
d. Melamine
e. Red phosphorus
and prokaryotes.
Answers
Answer:
Q.1 a) Lactobacillus Bacteria
b) Polymers
c) CNG
d) Petroleum
e) Pollution
Q.2 a) LPG is a cleaner fuel than wood because it doesn't produce smoke and pollution.
b) Plastic is a material of choice because it is simply a very cool, versatile material invented by humans.
c) Because chromosomes contains genetic information of DNA of parents that transfers to the offsprings due to hereditary.
d) Goldsmiths use outermost zone to melt gold and silver because it is the hottest part of a flame.
e) Water shouldn't be used to extinguish fire caused due to electricity or oil because water is a good conductor of electricity and can cause short circuits.
Q.3 a) Carbonisation is the conversion of organic matters like plants and dead animal remains into carbon through destructive distillation.
b) Prokaryotes do not have a nuclear membrane but eukaryotes have.
c) When charcoal burns, it produces a blue flame with more oxygen from the air to produce carbon dioxide gas.
d) Coal tar is widely used to manufacture paints, perfumes, synthetic dyes, photographic material, drugs and explosives.
e) Freezing delays spoilage and keeps foods safe by preventing microorganisms from growing and by slowing down the enzyme activity that causes food to spoil.
Q.4 a) Functions - Plastids are responsible for photosynthesis, storage of products like starch, and for the synthesis of many classes of molecules such as fatty acids and terpenes, which are needed as cellular building blocks and/or for the function of the plant.
b) Uses - PET scans may be used to evaluate organs and/or tissues for the presence of disease or other conditions.
c) Functions - The nuclear membrane encloses the DNA within the nucleus and protects it from the substances in the cytoplasm. It also regulates the entry and exit of substances in the nucleus.
d) Melamine Uses :-
1. Melamine is used in making thermosetting plastics.
2. Melamine is used in making dinnerware and kitchenware.
3. Melamine is used in making plywoods.
4. Melamine is used in making melamine resins.
5. Melamine is used in making decorative laminates.
6. Melamine foam acts as a good sound insulator.
e) Red phosphorus is used in the production of semiconductors, pyrotechnics, fertilizers, safety matches, pesticides, smoke bombs, incendiary shells in organic synthesis reactions and certain flame retardants. It is also used in electroluminescent coatings.
Explanation:
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Water is a liquid and also a good conductor of electricity. Being a liquid it has ions which are free (less than gases). So u should not use water for extinguishing fire caused by electricity, u might get an electric shock due to it.
Answer:
1
a) lactobacillus
b)(don't know sorry)
c) CNG and LPG
d)amphibians
e)pollution of air
2
a) LPG being a cleaner fuel than wood doesn't release smoke and other pollutants. Wood, on the other hand, releases a lot of smoke and fumes polluting the atmosphere causing pollution and leading to respiratory diseases. Hence, LPG is a better domestic fuel than wood.
b)Plastics are always a material of choice :
It is simply a very cool, versatile material invented by humans.
It's durability, strength and meltability makes it as material of choice.
It is in light weight and easy to carry heavy material.
c)It's chromosome is the correct answer. Because when the genes transfer during fertilizations it also transfer from parents to baby.
e)Water is a liquid and also a good conductor of electricity. Being a liquid it has ions which are free (less than gases). So u should not use water for extinguishing fire caused by electricity, u might get an electric shock due to it.
3
a)Carbonization is the term for the conversion of organic substance into carbon or carbon containing residue through pyrolysis or destructive distillation.
b)They have a definite nucleus. The chromatin bodies are enclosed by a nuclear membrane. Both asexual and sexual division occurs in eukaryotes.
c)Charcoal reacts with oxygen of the air at a glowing red heat to form colorless carbon monoxide gas, which then burns with a blue flame with more oxygen from the air to produce carbon dioxide gas. It is very poisonous and ventilation of rooms where charcoal is burning is essential.
e)Coal tar is used primarily for the production of refined chemicals and coal-tar products, such as creosote and coal-tar pitch. Certain preparations of coal tar have long been used to treat various skin conditions, such as eczema, psoriasis, and dandruff.
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Explanation: