5th Science Guide Term 1 Lesson 1 Organ System

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5th Science Guide Term 1 Lesson 1 Organ System

TN 5th Science Solutions Term 1 Chapter 1 Organ System Book Back Answers

5th Science English Medium Guide. 5th Science Term 1 Lesson 1 Organ System Book Back and Additional Questions and Answers. TN Samacheer kalvi guide Science Solutions. 5th All Subject Text Books Download pdf. Class 5 / Fifth Standard Term 1 Lesson 1 Organ System question answers. Class 1 to 12 Book Back Guide.

5th Science Guide Term 1 Lesson 1 Organ System

I. Choose the Correct Answer:

1. What is the length of the alimentary canal?

a) 3-5 m
b) 5-6 m
c) 9-11 m
d) 6-9 m

Answer:d) 6-9 m

2. Which organ is involved in respiration?

a) Kidney
b) Lungs
c) Heart
d) Brain

Answer:b) Lungs

3. How many kidneys do we have?

a) 2
b) 3
c) 1
d) 4

Answer:a) 2

4. Functional unit of brain is

a) Neuron
b) Nephron
c) Brain stem
d) Nerves

Answer:a) Neuron

5. Blood is bumped by

a) Lungs
b) Heart
c) Kidneys
d) Bones

Answer:b) Heart

II. Fill in the blanks:

1. A group of organs together make up an _______ system.

Answer:organ system

2. The process by which the body removes waste is called _______.

Answer:Excretion

3. The number of chambers in human heart is _______.

Answer:Four

4. The functional unit of kidney is _______.

Answer:Nephron

5. The human nervous system is divided into _______ parts.

Answer:Two

III. Say True or False:

1. The circulatory system is made up of the heart, blood, and blood vessels.

Answer: True

2. Important function of the heart is to transport blood with nutrients, oxygen, waste, and hormones.

Answer: True

3. The brain is protected by the rib cage.

Answer: False

4. The functional unit of kidney is neuron.

Answer: False

IV. Circle the odd one:

Question 1:

Answer:

V. Match the following:

Answer:

VI. Answer briefly:

1. Name the salivary glands in our mouth?

Answer:

The three parts of salivary glands in our mouth are parotid, sublingual and submandibular glands.

2. What is respiration?

Answer:

The process of providing oxygen to the tissues of the body and removing carbon dioxide from the tissues is called respiration.

3. What is the function of pericardial fluid?

Answer:

The space between the membranes is filled with pericardial fluid. This fluid protects the heart from shock.

4. Name the chambers in human heart?

Answer:

The heart is divided into four chambers. Two upper chambers are called atria or auricles. Two lower thicker chambers are called ventricles. The upper and lower chambers are separated by a muscular wall or tissue known as auriculo-ventricular septum of the heart.

5. Arrange the excretory system in correct sequence.

(Urinary bladder, Ureter, Kidney, Urethra).

Answer:

Kidney, Ureter, Urinary bladder, Urethra.

6.What are the two parts of peripheral nervous system?

Answer:

Peripheral nervous system consists of nerves extending from spinal cord to all parts of the body. It is made up of 2 parts.
Somatic nervous system
Autonomous nervous system.

7. What are the functions of blood?

Answer:

Blood transports nutrients, oxygen, wastes, and hormones.
It regulates the water level and body temperature.
It takes oxygen to tissues and cells finally reaches the lungs to take oxygen again.

VII. Answer in detail:

1. List out the functions of the digestive system.

Answer:

The process of conversion of complex food molecules into simpler molecules is called digestion.
Saliva moistens food.
Salivary enzymes which break down complex starch into simple carbohydrate molecules.
Digestive enzymes are used for digesting fats, proteins, and carbohydrates.

2. Explain the main parts of the circulatory system.

Answer:

In circulatory system, Blood is circulated to transport oxygen and nutrients to every part of the body through circulatory system.
Circulatory system consists of the

Heart
Blood
Blood Vessels
Heart:

The heart is a hollow, muscular organ conical in shape.
It is covered by a double walled pericardium membrane, filled with pericardial fluid.
This fluid protects the heart from shock.
Heart is placed inside the rib cage between the two lungs.
Heart has 4 chambers, the two upper chambers called auricles.
The two lower thicker chambers called ventricles.
The upper and lower chambers of the heart are separated by muscular wall known as auriculo-ventricular septum.
The right side of the heart receives de-oxygenated blood from various parts of body and pumped to the lungs for oxygenation.
The left side of the heart receives oxygenated blood from the lungs and pumps to different parts of the body.

Blood:

It transports nutrients’ oxygen, wastes and hormones.
It regulates the water level and body temperature.
Blood pumped through out the body by the heart.
It takes oxygen to the tissues and cells from the lungs.

Blood vessels:

Blood vessels consists of arteries and veins. Arteries carry oxygenated blood except pulmonary arteries which carries deoxygenated blood from the heart vein carries deoxygenated blood except pulmonary veins which carries oxygenated blood to heart.

3. Explain three major parts of human brain.

Answer:

Human brain is divided into 3 major parts.

Fore Brain (Cerebrum)
Mid Brain (Cerebellum)
Hind Brain (Medulla Oblongata)
Fore Brain – Cerebrum

The fore brain consists of cerebrum, thalamus and hypothalamus.

It is the largest part of the brain.
It is the centre of human memory.
It is responsible for intelligence, imagination and reasoning.

Mid Brain – Cerebellum

It lies behind the cerebrum.
It co-ordinates the movements of the muscules of body.
It helps to maintain the balance of the body.

Hind Brain – Medulla Oblongata

The hind brain comprises of pons and medulla oblongata.
It is also called the brain stem.
It controls breathing, heartbeat, and other involuntary muscles, so it is called “Vital Knot”.
It connects the brain to the spinal cord.

4. Label the diagram given below.

Answer:

5th Science Guide Term 1 Lesson 1 Organ System

VIII. Questions based on higher order thinking (HOT):

1. Why It is important to wear helmet while riding a bike?

Answer:

Wearing helmet helps to protect your life and protect your head from danger. The head and brain is the most vulnerable to injury in a motorcycle accident. Drivers and passengers wearing helmets increase their chances of survival over non-helmet wearers. Riders who do not wear helmets are at risk of suffering a traumatic brain injury, if they are in accident. Brain trauma often results in spinal cord injuries and disability that requires extended care and physical therapy. The damaged brain may deteriorate after hospitalization and die days to weeks after the injury due to secondary injury.

2. Eating fast-food and junk food affects our health. Justify.

Answer:

Fast food is usually higher in fat, calories cholesterol, and sodium in comparison to homemade meals.
Eating too much fast food can increase the risk for health problems such as high blood pressure, heart disease, and obesity.
Eating a poor quality diet high in junk food is linked to a higher risk of obesity, depression, digestive issues, heart diseases and stroke, type 2 diabetes, cancer, and early death.