Sugarcane is one of the important cash crops in India. It is grown to obtain
- A.Starch
- B.Glucose
- C.Fructose
- D.Sucrose
Correct answer
Explanation
The correct answer is D, Sucrose. The juice in the stem of sugarcane is rich in sucrose, the ordinary table sugar we get from it.
Sucrose is a disaccharide (C₁₂H₂₂O₁₁) made of one glucose and one fructose unit joined together. Sugarcane stores it in the juicy stem, which holds roughly 10 to 15 per cent sucrose; mills crush the cane, boil the juice and crystallise sugar, while jaggery (gur) and khandsari are made in villages. India is the world's second largest producer of sugarcane after Brazil, with Uttar Pradesh and Maharashtra the leading states. Sugar beet is the other main source of sucrose in cooler countries.
A is wrong because starch is the stored food of crops such as rice, wheat, maize and potato, not sugarcane. B is wrong because glucose is a simple sugar found in grapes and honey and is only one unit of sucrose. C is wrong because fructose is the fruit sugar of honey and many fruits, also only one unit of sucrose.
Exam tip: cane sugar = sucrose (glucose + fructose); fruit sugar = fructose; milk sugar = lactose; malt sugar = maltose.
Practice Questions
View allThe fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by
- A.Galileo
- B.Martin Luther
- C.Johannes Kepler
- D.Copernicus
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In 1609 Kepler showed that the planets move around the Sun in elliptical orbits, with the Sun at one focus of the ellipse.
Read the full explanation →Which one of the following statements is correct?
- A.Urea is produced in liver.
- B.Urea is produced in blood.
- C.Urea is produced from digestion of starch.
- D.Urea is produced in lung and kidney.
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Liver cells turn the toxic ammonia released from the breakdown of amino acids into urea through the ornithine cycle, also called the urea cycle.
Read the full explanation →Which one of the following is the correct sequence of passage of light in a compound microscope?
- A.Condenser-Objective lens-Eyepiece-Body tube
- B.Objective lens-Condenser-Body tube-Eyepiece
- C.Condenser-Objective lens-Body tube-Eyepiece
- D.Eyepiece-Objective lens-Body tube-Mirror
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Light passes through the condenser to the specimen, is picked up by the objective lens, travels up the body tube and reaches the eye through the eyepiece.
Read the full explanation →Which one of the following statements regarding haemoglobin is correct?
- A.Haemoglobin present in RBC can carry only oxygen but not carbon dioxide.
- B.Haemoglobin of RBC can carry both oxygen and carbon dioxide.
- C.Haemoglobin of RBC can carry only carbon dioxide.
- D.Haemoglobin is only used for blood clotting and not for carrying gases.
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It binds oxygen at its iron-containing haem groups and carries some carbon dioxide on its protein chains. Each haemoglobin molecule has four polypeptide chains and four haem groups, and each haem iron can hold one oxygen molecule, forming oxyhaemoglobin in the lungs.
Read the full explanation →Which one of the following statements regarding histone proteins is correct?
- A.Histones are proteins that are present in mitochondrial membrane.
- B.Histones are proteins that are present in nucleus in association with DNA.
- C.Histones are proteins associated with lipids in the cytosol.
- D.Histones are proteins associated with carbohydrates in the cytosol.
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They are the proteins around which DNA winds to form chromatin in the nucleus of eukaryotic cells. Histones are small basic proteins, rich in the positively charged amino acids lysine and arginine, which attract the negatively charged phosphate groups of DNA.
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