Digestive System Concise ICSE Class-9 Biology Selina Publishers

Revised Biology Chapter-11 Digestive System Solutions

Digestive System Concise ICSE Class-9 Biology Selina Publishers Chapter-11 . We Provide Solutions of Progress Check , MCQs, Very Short Answer Type, Short Answer Type, Long Answer Type Questions and Structured / Applications / Skill Type Questions of Exercise-11 Respiration in Plants. Visit official Website CISCE  for detail information about ICSE Board Class-9.

Digestive System Concise ICSE Class-9 Biology Selina Publishers

.–: Select Topics :–

1_Progress Check (page-107),

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2_Progress Check (page-109),

3_Progress Check (page-112),

4_Progress Check (page-113),

5_Progress Check( Page-114)

A.MULTIPLE CHOICE TYPE,

B.VERY SHORT ANSWER TYPE,

C.SHORT ANSWER TYPE,

D.LONG ANSWER TYPE

E. Structured /Application/Skill Type

Note :-  Before Viewing Concise Solutions of Chapter-11 Digestive System. Read the whole chapter carefully with figure. Focus on The structure of a tooth , different types of teeth. Function of different types of teeth .

Dental formula for adult, their function (including enzymes and their functions in digestion, absorption  and assimilation of digested food). brief idea of peristalsis.


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Progress Check (page-107), Chapter-11 Digestive System Concise Biology Solutions  

Question 1 

Given……………pharynx.

Answer 1

 Correct sequence is-Pharynx, Oesophagous, Stomach,Small intestine, Large intestine

Question 2

Name the following.

(i)…….

(ii)…….

(iii)…….

Answer 2

(i)Duodenum ,jejunum,Ilium

(ii)Caecum, Colon ,Rectum

(iii)Parotid, Sub mandibular, Sublingual Gland,

Question 3

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Give ….jaw.

(i)…….

(ii)…….

(iii)…….

(iv)…….

Answer 3

(i)…….Molar

(ii)…….Canine

(iii)…….Incisor

(iv)…….Milkn Teeth

Question 4

Name the following Part of Tooth

(i)…….

(ii)…….

(iii)…….

(iv)…..

(v)…….

Answer 4

(i)…….Crown

(ii)…….Enamel

(iii)……Pulp

(iv)…..Cement 

(v)…….Neck


Progress Check (page-109), Selina Solutions of Chapter-11 Digestive System 

 Question

Mention………false(F):

(i)…….

(ii)…….

(iii)…….

(iv)…..

(v)…….

(vi)……

(vii)……….

Answer

(i)….True

(ii)…..False

(iii)……True

(iv)…..True

(v)…..False

(vi)……False

(vii)…..True


Chapter-11 Digestive System Progress Check (page-112) Concise Biology Solutions  

Question 1

Mention if….false(F)

(i)….

(ii)….

(iii)….

(iv)…

(v)….

(vi)…..

Answer 1

(i)….True

(ii)….False ( intestine is narrow for slow movement)

(iii)….True

(iv)…True

(v)….True

(vi)…..True

Question 2

Name the enzyme which digest:

(i)…….

(ii)…….

(iii)…….

(iv)…..

Answer 2

(i)…Amylase/Ptylin

(ii)…..Lipase

(iii)…..Trypsin

(iv)…..Sucrose

Question 3

What are the end product of digestion of

(i)…….

(ii)…….

(iii)…….

(iv)…..

Answer 3

(i)….Peptide, Amino Acid

(ii)…..Fatty acid, Glycerol

(iii)…..Maltose

(iv)…..Glucose or Fructose


Progress Check (page-113), Selina Publishers Solutions Chapter-11 Digestive System

Question

Fill in the blnaks

(i)…….

(ii)…….

(iii)…….

(iv)…..

Answer

(i)…Glycogen

(ii)…RBCs

(iii)…..Liver,……Amino Acid.

(iv)…..38


Progress Check( Page-114) Digestive System Solutions Chapter-11 for Selina Biology

Question

(i)

(ii)

(iii)

(iv)

Answer

(i) Protien

(ii)  Starch

(iii) Flucose

(iv) Mineral Substances


Review Question 

 A.Multiple Choice Questions: Chapter:- 11 Digestive System Solutions for ICSE Class 9th Concise Biology 

Question 1

Pylorus is an opening from

(i) oseophagus into stomach

(ii) mouth cavity into stomach

(iii) stomach into intestine

(iv) intestine into rectum

Answer 1

(iii) stomach into intestine

Question 2

Gastric juice contains

(i) HCl and pepsin

(ii) pepsin and trypsin

(iii) trypsin and HCl

(iv) amylopsin and pepsin

Answer 2

(i) HCl and pepsin

Question 3

The water from the digested food is mainly absorbed by

(i) stomach

(ii) duodenum

(iii) colon

(iv) rectum

Answer 3

(iii) colon

Question 4

Which one of the following pairs of types of teeth perform one common function as stated against it?

(i) Incisors, canines – Holding

(ii) Canines, premolars – Biting

(iii) Premolars, molars – Grinding

(iv) Molars, incisors – Tearing

Answer 4

(iii) Premolars, molars – Grinding


B. VERY SHORT ANSWER TYPE Chapter:- 11 Digestive System Selina Solutions 

Question 1

What is the dental formula of a normal human adult?

Answer 1

The dental formula of a normal human adult is:

Human adult = = 32 (Permanent teeth + Wisdom teeth)

Question 2

Mention two reflexes which occur when a person chews and swallows food.

Answer 2

The two reflexes which occur when a person chews and swallows food are:

Reflex when a person chews – Secretion of saliva

Reflex when a person swallows – Tongue presses upward and back against the roof (palate)

Question 3

Consider the following two statements A and B and select the right option from (i)-(iv) about their correctness.

Small intestine is shorter than large intestine.

Small intestine is wider than large intestine.

Options :

(i)Both the statements are correct

(ii) Both the statements are wrong

(iii) Statement A is correct, B is wrong

(iv) Statement B is correct, A is wrong

Answer 3

(ii) Both the statements are wrong. Small intestine is longer (7 metres) than large intestine (1.5 metres). Also, large intestine is so called because of its width which is larger than that of small intestine.


C. SHORT ANSWER TYPE Chapter:- 11 Digestive System Solutions for Selina Publishers

Question 1

What is digestion? Why do only animals require a digestive system?

Answer 1

Digestion is the process of breaking down complex food materials into simpler substances by the action of enzymes.

Need for a digestive system:

(i) Large complex molecules like carbohydrates, proteins and lipids need to be broken down to simpler molecules. These simpler molecules can then be absorbed and utilized by the body.

(ii) The breaking down of complex food molecules into their simpler form is possible only through the process of digestion.

(iii) During digestion, large complex macromolecules present in food are converted into small simpler molecules, which can be simplified in different compartments of digestive system only.

Question 2

What are the end products of the digestion of: starch, proteins and fats respectively?

Answer 2

SUBSTRATE END

PRODUCTS

Starch Maltose
Proteins Small

peptides

and

amino

acids

Fats Fatty

acids

and

glycerol

 

Question 3

Why is there no enzyme to digest vitamins?

Answer 3

Vitamins are used in their original form by the cells. They do not require digestion. So They are either water soluble or fat soluble, hence no enzyme is required to digest vitamins. It is  absorbed directly from the digestive tract, transported by blood to the cells, and the cells absorb and use them whenever they need. Besides, vitamins themselves act as catalysts or enzymes in essential chemical reactions that take place in the body.

Question 4

How is thorough chewing of food helpful in digestion?

Answer 4

It is very important to chew our food thoroughly as chewing of food helps to break down complex food materials into simpler substances. The act of chewing stimulates the salivary glands to release saliva. The saliva helps to moisten the food and form bolus, which can be swallowed easily. Saliva also contains special enzymes that help to break down carbohydrates.

Question 5

What is the function of rectum?

Answer 5

Rectum acts as a temporary storage site for undigested food. It has voluntary smooth muscles that remove the faeces out of the body through the anus.

Question 6

What is roughage? Give two examples.

Answer 6

Roughage is a dietary fibre that largely consists of cellulose. It cannot be digested by our body as our body does not contain cellulose-digesting enzymes.

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