Organ Systems In Animals Book Back Questions 9th Science Lesson 20
9th Science Lesson 20
20] Organ Systems In Animals
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
Rennin: Causes curdling of milk protein casein and increases digestion of proteins.
Renin: Converts angiotensinogen to angiotensin and regulate the absorption of water and Na+ from glomerular filtrate.
William Beaumont (1785 – 1853): William Beaumont was a surgeon who was known as the ‘Father of Gastric Physiology’. Based on his observations he concluded that the stomach’s strong hydrochloric acid played a key role in digestion.
The small intestine is about 5 m long and is the longest part of the digestive system. The large intestine is a thicker tube, but is about 1.5 m long.
Two healthy kidneys contain a total of about 2 million nephrons, which filter about 170 – 180 litres of blood per day. The kidneys reabsorb ad redistribute 99% of the blood volume and only 1% o the blood filtered becomes urine.
First kidney transplant: In 1954, Joseph E. Murray and his colleagues at Peter Bent Brigham Hospital in Boston, USA performed first successful kidney transplant between Ronald and Richard Herrick who were identical twins. The recipient Richard Herrick died after 8 years of transplantation.
The sperm is the smallest cell in the male body. A normal male produces more than 500 billion sperm cells in his life time. The process of formation of sperms is known as spermatogenesis.
An ovum is the largest human cell. The process of formation of ova is known as oogenesis.
Choose the best answers:
1. Which of the following is not a salivary gland?
(a) Sublingual
(b) Lachrymal
(c) Submaxillary
(d) Parotid
2. Stomach of human beings mainly digests __________________
(a) Carbohydrates
(b) Proteins
(c) Fat
(d) Sucrose
3. To prevent the entry of food into the trachea, the opening is guarded by ________________
(a) Epiglottis
(b) Glottis
(c) Hard palate
(d) Soft palate
4. Bile helps in the digestion of ______________
(a) Proteins
(b) Sugar
(c) Fats
(d) Carbohydrates
5. The structural and functional unit of the kidney is __________________
(a) Villi
(b) Liver
(c) Nephron
(d) Ureter
6. Which of the following substance is not a constituent of sweater?
(a) Urea
(b) Protein
(c) Water
(d) Salt
7. The common passage meant for transporting urine and sperms in male is _______________
(a) Ureter
(b) Urethra
(c) Vas deferens
(d) Scrotum
8. Which of the following is not a part of female reproductive system?
(a) Ovary
(b) Uterus
(c) Testes
(d) Fallopian tube
Fill in the blanks:
1. The opening of the stomach into the intestine is called ________________.
2. The muscular and sensory organ which helps in mixing the food with saliva is _______________.
3. Bile, secreted by liver is stored temporarily in ______________.
4. The longest part of alimentary canal is _______________.
5. The human body functions normally at a temperature of about ________________.
6. The largest cell in the human body of a female is _______________.
State true or false. If false, correct the statement:
1. Nitric acid in the stomach kills microorganisms in the food.
2. During digestion, proteins are broken down into amino acids.
3. Glomerular filtrate consists of many substances like amino acids, vitamins, hormones, salts, glucose and other essential substances.
Match the following:
Organ Elimination
1. Skin – Urine
2. Lungs – Sweat
3. Intestine – Carbon dioxide
4. Kidneys – Undigested food
Consider the statements given below and choose the correct option:
Mark the correct answer as:
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.
1. Assertion: Urea is excreted out through the kidneys.
Reason: Urea is a toxic substance.
2. Assertion: In both the sexes gonads perform dual function.
Reason: Gonads are also called primary sex organ.
Answers:
Choose the best answers:
1. Lachrymal 2. Proteins 3. Epiglottis 4. Fats 5. Nephron 6. Protein 7. Urethra 8. Testes
Fill in the blanks:
1. Duodenum 2. Tongue 3. Gall bladder 4. Small intestine 5. 370C 6. Ovum
State true or false. If false, correct the statement:
1.False
Correct answer: HCl in the stomach kills microorganisms in the food.
2.True
3.True
Match the following:
1.Skin- Sweat
2.Lungs- Carbon dioxide
3.Intestine- Undigested food
4.Kidneys- Urine
Consider the statements given below and choose the correct option:
1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.