Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2

A thorough understanding of Kerala Syllabus 9th Standard Biology Notes Pdf Chapter 2 Digestion and Transport of Nutrients Extra Questions and Answers can improve academic performance.

Kerala Syllabus Std 9 Biology Chapter 2 Digestion and Transport of Nutrients Extra Questions and Answers

Question 1.
What is the function of the small intestine?
Answer:
The small intestine is responsible for the digestion and absorption of nutrients from food.

Question 2.
What is the first part of the small intestine called?
Answer:
The first part of the small intestine is called the duodenum.

Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2

Question 3.
What is lymph, and how does it differ from blood?
Answer:
Lymph is a fluid derived from tissue fluid that enters specialized vessels called lymph capillaries.
It differs from blood in that it lacks red blood cells and large protein molecules.

Question 4.
What is the role of the lymphatic system in digestion?
Answer:
The lymphatic system plays a vital role in transporting certain products of fat digestion and fatsoluble vitamins absorbed from the small intestine. These are transported through lymph vessels instead of directly entering the bloodstream.

Question 5.
What is the pericardium, and what is its function?
Answer:
The pericardium is a double-layered membrane that surrounds and protects the heart. The pericardial fluid fills the space between these layers, reducing friction during heartbeats.

Question 6.
How does blood enter the heart?
Answer:
Deoxygenated blood from the body enters the right atrium through two large veins called the superior venacavá and inferior vena cava.

Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2

Question 7.
What is an electrocardiogram (ECG) and how is it
Answer:
An ECG is a test that measures the electrical activity of the heart. By analyzing the ECG waveform, doctors can detect heart problems that affect its rhythm or function.

Question 8.
What are the nutrients we get from food?
Answer:
Carbohydrate, Protein, fat, Minerals, vitamins & water.

Question 9.
……….. is a calcium containing connective tissue that holds the tooth in the socket of the gum.
Answer:
Cementum

Question 10.
How does the food we swallowed enter the oesophagus properly without entering the trachea? Explain?
Answer:
The Tongue compresses the food into balls with the help of the palate. That time, Uvula closes the nasal cavity that opens to the pharynx and the trachea tilts up and it is closed by the epiglottis.

Question 11.
What do you mean by peristalsis?
Answer:
Peristalsis is the wave like movement of the oesophagus, stomach and intestines.

Question 12.
What is the role of chemical digestion?
Answer:
Chemical digestion breaks down complex nutrients (like proteins, carbohydrates, and fats) into simpler absorbable forms (like amino acids, sugars, and fatty acids). This is achieved by enzymes present in digestive juices secreted by various organs along the digestive tract.

Question 13.
Redraw the diagram. Identify and label the parts mentioned below.
Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2 4
a) Living tissue which forms the tooth.
b) Part where blood vessels are present.
c) The hardest part of the tooth.
Answer:
a) Dentine
b) Pulp
c) Enamel

Question 14.
Observe the given diagram related to the absorption of substances into lacteals and answer the questions.
a. Identify the process.
b. Which nutrients are absorbed through this process?
Answer:

  • Simple diffusion
  • Fatty acid and glycerol

Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2

Question 15.
Given indicators are related to a specific part of the wall of heart. Analyse them and answer the questions.

  • Functions like an electric cell.
  • Located on the right atrial wall.

a) Which part of the heart is mentioned in the hints?
b) What is its function?
Answer:
a) Pacemaker (Sino atrial node)
b) Initiates the contribution and relaxation of heart regulates the rate of heartbeat.

Question 16.
Describe the structure of the small intestine that aids in absorption.
Answer:
The small intestine has a long, coiled shape and a small diameter, maximizing its length for increased absorption. The inner wall is lined with finger-like projections called villi, which significantly increase the surface area for nutrient absorption.

Question 17.
What is tissue fluid, and how does it form?
Answer:
Tissue fluid is the fluid that oozes out from the blood capillaries into the spaces between cells. This occurs through tiny pores in the capillary walls.

Question 18.
Complete the illustration related to human circulatory system.
Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2 5
Answer:

  • Double circulation
  • Systematic circulation
  • Start from the right ventricle and ends in the left atrium.

Question 19.
Arrange the given steps of blood circulation in the correct order, starting from Right atrium.

  • Blood from different parts of the body reaches the right atrium.
  • Blood passes through the pulmonary artery to the lungs.
  • Right ventricle contracts.
  • Blood reaches the left atrium through the pulmonary veins.
  • Right ventricle receives blood through the tricuspid valve.
  •  Left ventricle receives blood through the bicuspid valve.

Answer:

  • Blood from different parts of the body reaches the right atrium.
  • Right ventricle receives blood through the tricuspid valve.
  • Right ventricle contracts.
  • Blood pass through the pulmonary artery to lungs.
  • Blood reaches the left atrium through the pulmonary veins.
  • Left ventricle receives blood through the bicuspid valve

Digestion and Transport of Nutrients Class 9 Extra Questions and Answers Kerala Syllabus Biology Chapter 2

Question 20.
How does water reach the xylem tubes in the roots?
Answer:
Water enters the root cells by osmosis, moving from an area of higher water concentration to an area of lower water concentration

Question 21.
What are the main forces that drive water movement through the xylem?
Answer:
The main forces responsible for water movement through the xylem are cohesion and adhesion:

  • Cohesion: The attraction between water molecules due to hydrogen bonding. This allows water molecules to form a continuous chain that pulls water upwards.
  • Adhesion: The attraction of water molecules to the walls of the xylem tubes. This helps create a. continuous water column that resists breaking.

Question 22.
How does water loss from leaves through transpiration contribute to water movement?
Answer:
Transpiration is the loss of water vapor from leaves through tiny pores called stomata. As water evaporates from leaves, it creates a suction force that pulls water upwards through the xylem from the roots. This “pull” is aided by the cohesive and adhesive properties of water.

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