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Test: Digestion & Absorption - 2 (Old NCERT) - JAMB MCQ


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25 Questions MCQ Test Biology for JAMB - Test: Digestion & Absorption - 2 (Old NCERT)

Test: Digestion & Absorption - 2 (Old NCERT) for JAMB 2024 is part of Biology for JAMB preparation. The Test: Digestion & Absorption - 2 (Old NCERT) questions and answers have been prepared according to the JAMB exam syllabus.The Test: Digestion & Absorption - 2 (Old NCERT) MCQs are made for JAMB 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Digestion & Absorption - 2 (Old NCERT) below.
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Test: Digestion & Absorption - 2 (Old NCERT) - Question 1

The optimum pH meant for hydrolyzing starch is

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 1

About 30 percent of starch is hydrolysed by the enzyme at optimum pH 6.8 into a disaccharide –maltose.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 2

Absorption of fats takes place through :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 2

Lymph capillaries pick up the excess interstitial fluid & proteins and return them to the venous blood. 
The blood capillaries absorb most nutrients, but the Fats & Fat-soluble vitamins are absorbed by the lacteals.
The lymph in the lacteals has a milky appearance due to its high Fat content & is called chyle.

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Test: Digestion & Absorption - 2 (Old NCERT) - Question 3

People who are lactose intolerant:
(i) Cannot digest food with lactose in them.
(ii) They need to take a calcium supplement.

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 3

(i) People who are lactose intolerant cannot digest food with lactose in them.
(ii) These people need to take a calcium supplement which is naturally present along with lactose in milk.

Hence, option C is correct.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 4

_____ from pharynx is conveyed into the oesophagus by _____ .

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 4

The bolus is conveyed into the pharynx and then into the oesophagus by swallowing or deglutition. The bolus further passes down through the oesophagus by successive waves of muscular contractions called peristalsis.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 5

Active form of which enzyme hydrolyses milk protein in the stomach?

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 5
  • Chymosin, known also as rennin, is a proteolytic enzyme related to pepsin that is synthesized by chief cells in the stomach of some animals.
  • Its role in digestion is to curdle or coagulate milk in the stomach, a process of considerable importance in the very young animal. Rennin is absent in adults.
  • If milk were not coagulated, it would rapidly flow through the stomach and miss the opportunity for initial digestion of its proteins.
Test: Digestion & Absorption - 2 (Old NCERT) - Question 6

All are digestive glands except :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 6

Liver, pancreas and salivary gland are digestive glands that release enzymes for digestion of food but thyroid gland release thyroxine hormone that help in metabolism of carbohydrates, proteins and fats.

Topic 6.1 And 6.2 Digestion And The Blood System - Lessons - Blendspace

Test: Digestion & Absorption - 2 (Old NCERT) - Question 7

Liver stores extra glycogen but once storage limit is reached then extra carbohydrate will be:

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 7

Liver converts glucose into glycogen and stores glycogen. Once the storage limit is reached then extra carbohydrates will be converted into fats.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 8

The bile duct and the pancreatic duct open together into the duodenum as

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 8

The bile duct and the pancreatic duct open together into the duodenum as the common hepato-pancreatic duct which is guarded by a sphincter called the sphincter of Oddi.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 9

Digestion can be defined as :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 9

The process of conversion of complex food substances to simple absorbable forms is called digestion.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 10

Correct sequence of layers in gut wall from inside to outside is :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 10

Serosa is the outermost layer while mucosa is the innermost layer.

Histology of Human Gut | DrBeen
The layer next to mucosa is the sub-mucosa containing nerves, blood and lymph vessels. Muscularisi s found between sub-mucosa and serosa.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 11

Which of the following is not a common disorder associated with the digestive system?

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 11

Tetanus also called lockjaw disease is a serious bacterial infection that causes painful muscle spasms and can even lead to death. Tetanus is not a common disorder associated with the digestive system.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 12

Trans-fats:
(i) They are found in most processed and fast foods. Example: French fries.
(ii) They help food stay fresh for a long time.
(iii) They are much better type of fat than saturated fats.

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 12

Trans-fats are made when food makers turn liquid oils into solid fats, like shortening or margarine.
(i) Trans-fats can be found in many fried, "fast", packaged, or processed food.
(ii) Partial hydrogenation of vegetable oils is done to make fats more solid at room temperature, to increase their shelf life by keeping their flavor stable over longer periods of time, and to guard against spoilage.
(iii) Trans-fats are the worst type of fats.

Hence, option A is correct.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 13

Read the following statements :
i. In ruminants cellulose digesting bacteria are present in the digestive system.
ii. Such digestion by microbial activity is called antagonistic digestion.
iii. Camels and deers are ruminants lacking an omasum chamber.

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 13

(i) Ruminants have a four-chambered gut, and these microorganisms live primarily in the rumen. One particularly important bacterial genus that takes part in the degradation of cellulose is gram positive Ruminococcus.
(iii) Some ruminants like camels and deer do not have omasum. The omasum is the third chamber in the ruminant stomach. Function of the omasum is absorption.

Hence, Statement (i) and (iii) are correct.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 14

In Reema’s body, substances in bile harden forming stone in the gall bladder. What can be the possible treatment?

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 14

It is difficult to remove stone surgically and by lithotripsy. So, in most of the cases gall bladder is removed surgically.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 15

Which of the following is a mismatched pair?

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 15

Diastema is the gap between the teeth of human beings.
Generally, diastema is not present in human beings

Test: Digestion & Absorption - 2 (Old NCERT) - Question 16

Which among the following is not in the wall of the alimentary canal?

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 16

The wall of alimentary canal from oesophagus to rectum possesses four layers namely serosa, muscularis, sub-mucosa and mucosa.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 17

Which layer of alimentary canal forms villi?

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 17

Mucosa layer forms irregular folds (rugae) in the stomach and small finger-like foldings called villi in the small intestine

Test: Digestion & Absorption - 2 (Old NCERT) - Question 18

Numerous folds present on the inner surface of stomach are called rugae. Another part of digestive tract which contains rugae is

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 18

Numerous folds present on the inner surface of the stomach are called rugae.

They are a series of ridges produced by folding the wall of an organ.

Another part of the digestive tract which contains rugae is the palate, the top part inside the mouth.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 19

Which of the following is not secreted from its source in the form of a Zymogen :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 19

Zymogen is an inactive enzyme precursor that requires biochemical change to become active. Amylase enzyme is not released from its source in the form of proenzyme or zymogen.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 20

If an imaginary food contains 5 grams of protein, 4 grams of fat and 10 grams of carbohydrates. Now calculate total calories it would provide (given 1g protein = 4 calories, 1g fat = 10 calories, 1g carbohydrates = 4 calories) :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 20

5 g of protein = 5 x 4 = 20 calories
4 g of fat = 4 x 10 = 40 calories
10 g of carbohydrates = 10 x 4 = 40 calories.

Total energy produced = 20 + 40 + 40 = 100 calories.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 21

The reflex action of vomiting is controlled by

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 21

Medulla oblongata consist of an accumulation of nerve cells that act as vital centres of many reflexes like vomiting, sneezing, coughing.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 22

Blood vessels of alimentary canal :
(i) provide nourishment to the cells of the alimentary canal.
(ii) absorb digested fat molecules from the stomach and intestine.

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 22

(i) Blood vessels of the alimentary canal provide nourishment to the cells of the alimentary canal.
(ii) Blood vessels of the alimentary canal do not absorb digested fat molecules from the stomach and intestine.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 23

Out of the following which one don’t provide any calories : 

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 23

Fats, protein, and alcohol on oxidation produce energy along with other products but vitamins are not oxidized to release energy to us.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 24

Parodontax toothpaste launched few months ago that help to prevent periodontal disease which are caused by microbe named :

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 24

Porphyromonas gingivalis bacteria is responsible for periodontal disease of the mouth. Parodontax toothpaste helps to prevent periodontal disease.

Test: Digestion & Absorption - 2 (Old NCERT) - Question 25

In the stomach, gastric acid is secreted by the

Detailed Solution for Test: Digestion & Absorption - 2 (Old NCERT) - Question 25

The main constituent of gastric acid is hydrochloric acid which is produced by parietal cells (also called oxyntic cells) in the gastric glands in the stomach

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