Samacheer Kalvi 9th Term II Science Book Back Question and Answers – Unit 8:

Samacheer Kalvi 9th Standard New Science Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 9 New Syllabus 2021 to 2022 Book Back Question & Answer solutions available for both English and Tamil Medium. Class 9 Science Book Term 2 Unit 8 – Organ Systems in Animals Answers/Solutions are provided on this page. 9th Std Science Book is of Term 1st, 2nd, 3rd, and consists of 9 Units in each Term. All 9 Units of Term 1st, 2nd, 3rd Science Book Back One, and Two Mark Solutions are given below.

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Samacheer Kalvi 9th Science Book Back Unit 8 Term 2 Solutions Guide PDF:

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Term – 2

Unit – 8

Organ Systems in Animals

I. Choose the correct answer:

1. Which of the following is not a salivary gland?
a) sublingual
b) lachrymal
c) sub maxillary
d) parotid

2. Stomach of man 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. Excretion mean
a) taking in oxygen from the air and giving out carbon dioxide.
b) disposal of harmful germs and worms from our body.
c) distribution of digested food to the body tissues through blood.
d) removal of nitrogenous wastes generated in the body.

6. The structural and functional unit of the kidney is
a) villi
b) liver
c) nephron
d) ureter

7. Which one of the following substance is not a constituent of sweat?
a) urea
b) protein
c) water
d) salt

8. The common passage meant for transporting urine and sperms in male is
a) ureter
b) urethra
c) vas deferens
d) scrotum

9. Which of the following is not a part of female reproductive system?
a) ovary
b) uterus
c) testes
d) fallopian tube

II. Fill in the blanks:

1. The opening of the stomach into the intestine is called pylorus
2. The muscular and sensory organ which helps in mixing the food with saliva is tongue
3. Bile, secreted by liver is stored temporarily in gall bladder
4. The longest part of alimentary canal is small intestine
5. organs which are concerned with the formation, storage and elimination of urine constitute the
excretory system
6. The human body functions normally at a temperature of about 37oC
7. In the process of urine formation, maximum amount of water from the glomerular filtrate is reabsorbed in the proximal convoluted tubule
8. The largest cell in the human body of a female is ovum

III. Match the following.

Organ               Elimination
1) Skin                  a) urine
2) Lungs              b) sweat
3) Intestine         c) carbon dioxide
4) Kidneys           d) Undigested food
Ans: 1-b; 2- c; 3- d; 4- a

IV. Stale whether the following statements are true or false, correct the wrong statements.

1. Nitric acid in the stomach kills microorganisms in the food.
Ans: – False, Hydrochloric acid in the stomach kills microorganisms in the food.

2. During digestion, proteins are broken down into amino acids.
Ans:- False, During digestion, proteins are broken down into polypeptides and dipeptides.

3. Glomerular filtrate consists of many substances 1ik amino acids, vitamins, hormones, salts, glucose and other essential substances.
Ans: – False,Glomerular filtrate does not contain hormones.

4. Besides the normal constituents, the urine may pass out excess vitamins and not the antibiotics.
Ans: False, Vitamins are reabsorbed into blood by selective reabsorption. Antibiotics like penicillin and aspirin are passed into the filtrate in the distal convoluted tubules. Theyare then excreted along with urine.

5. The process of release of ovum from ovary is called gestation.
Ans: – False, The process of release of ovum from ovary is called ovulation.

V. Identify the following parts:

1. It conducts food from pharyrix to stomach by peristalsis. – Oesophagus
2. Finger like projections which enhance the absorbing capacity of small intestine – Villi
3. The bunch of capillaries inside the bowman’s capsule – glomerulus
4. This muscular tubes which carry urine from kidney to urinary bladder. – ureter.
5. Small sac-like muscular structures that enclose testes – Scrotum

VI. Short Questions & answer:

1. Arrange the following five steps of nutrition in correct sequence.
(digestin, assimilation, ingestion, egestion, absorption) Ingestion, digestion, absorption, assimilation, egestion.

2. The stomach secretes gastric juice, which contains hydrochloric acid. What is its function?
It kills bacteria in food and makes the medium acidic.

3. How is the small intestine designed to absorb digested food?
The small intestine is the longest part of the alimentary canal, which is a long coiled tube measuring aboutn 5-7m. it comprises three parts – duodenum, jejunum and ileum. The nutrients after digestion are absorbed by villi in the small intestine.

4. Why do we sweat?
The human body functions normally at a temperature of about 37oC. when it gets hot sweat glands start secreting sweat, which contains water with small amounts of other chemicals like ammonia, urea, lactic acid and salts (mainly sodium chloride) . the sweat passes through the pores in the skin and gets evaporated.

5. State any two vital functions of human kidney.
The kidney
1. Maintain the fluid and electrolytes balance in our body.
2. Regulate acid-base balance of blood.
3. Maintain the osmotic pressure in blood and tissues.
4. Help to retain the important plasma constituents like glucose and amino acids.

6. How is it possible to control the urge to pass urine?
When the urinary bladder is full the urine is expelled out through the urethra. The urethra is surrounded by sphincter muscles. When they relax the urethra expands and expels urine. This process is called micturition. The sphincter muscles are voluntary muscles and they help us to control the urge to pass urine.

7. Write the names of male and female sex hormone.
Male – testosterone; Female – Oestrogen

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