Question
What are the components of blood$?$
✓
Answer
The main components of blood are
$1)$ Red blood cells $(RBCs):$ Red blood cells are the most abundant cells in the blood. These cells contain a red pigment called haemoglobin. It is the haemoglobin which carries oxygen and transports it to all parts of the body
$2)$ White blood cells $(WBCs):\ WBCs$ are colourless cells without haemoglobin. They fight against infections and protect the body from foreign particles such as germs and bacteria
$3)$ Platelets: Platelets are the smallest cells in the blood. The main function of platelet is to prevent bleeding.
$1)$ Red blood cells $(RBCs):$ Red blood cells are the most abundant cells in the blood. These cells contain a red pigment called haemoglobin. It is the haemoglobin which carries oxygen and transports it to all parts of the body
$2)$ White blood cells $(WBCs):\ WBCs$ are colourless cells without haemoglobin. They fight against infections and protect the body from foreign particles such as germs and bacteria
$3)$ Platelets: Platelets are the smallest cells in the blood. The main function of platelet is to prevent bleeding.
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- Liquid waste products.
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Read the passage and answer the questions :
A student is conducting an experiment to observe the reaction of magnesium ribbon when it is burned in air. The student first cleans a small piece of magnesium ribbon using sandpaper and then ignites it using a flame. The ribbon burns with a dazzling white flame, and a white powdery substance is formed after the reaction. The student records these observations and continues to investigate the nature of the product formed by adding a small amount of water to the white powder.
Q.1. What is the white powder formed after burning magnesium ribbon?
(a) Magnesium sulphate
(b) Magnesium oxide
(c) Magnesium hydroxide
(d) Magnesium carbonate
Q.2. Which of the following will most likely happen after magnesium ribbon burns?
(a) The product will turn blue litmus paper red
(b) The product will turn red litmus paper blue
(c) The product will have no effect on litmus paper
(d) The product will blue litmus paper red as well as red litmus paper blue
Q.3. What is the result of adding water to magnesium oxide?
(a) It forms an acidic solution
(b) It forms a basic solution
(c) It forms a neutral solution
(d) It does not react with water
A student is conducting an experiment to observe the reaction of magnesium ribbon when it is burned in air. The student first cleans a small piece of magnesium ribbon using sandpaper and then ignites it using a flame. The ribbon burns with a dazzling white flame, and a white powdery substance is formed after the reaction. The student records these observations and continues to investigate the nature of the product formed by adding a small amount of water to the white powder.
Q.1. What is the white powder formed after burning magnesium ribbon?
(a) Magnesium sulphate
(b) Magnesium oxide
(c) Magnesium hydroxide
(d) Magnesium carbonate
Q.2. Which of the following will most likely happen after magnesium ribbon burns?
(a) The product will turn blue litmus paper red
(b) The product will turn red litmus paper blue
(c) The product will have no effect on litmus paper
(d) The product will blue litmus paper red as well as red litmus paper blue
Q.3. What is the result of adding water to magnesium oxide?
(a) It forms an acidic solution
(b) It forms a basic solution
(c) It forms a neutral solution
(d) It does not react with water
Rahul was a student of class VII. His father purchased a new bicycle for him on his birthday. After few months, he found that the cycle chain and the handle gets rusted. His father advised him to apply a coating of paint to the cycle and not to keep it in the open in future.
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(i) Why his cycle gets rusted?
(ii) What do you mean by rusting of iron?
Now, answer the following questions
(i) Why his cycle gets rusted?
(ii) What do you mean by rusting of iron?
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