Extra Class 7 Transport of substances in plants and animals Notes & Pdf

Extra Class 7 Transport of substances in plants and animals Notes & Pdf is important for the students of 7th standard. Notes are provided here in such a way that students can understand the Chapter in an interesting way. This Extra Class 7 Transport of substances in plants and animals Notes & Pdf could provide extra benefits in excelling a students curriculum . Students should practice their solutions regularly to prepare effectively for their examination.

I. Choose the correct option to complete each sentence.

1. The tiny branches of blood vessels that connect arteries with the veins are called ….

a) lymph nodes

b) capillaries

c) white blood cells

d) trachea

Ans : b) capillaries

2. The heart beat is also called ….

a) pulse

b) transfusion

c) circulation

d) respiration

Ans: a) pulse

3. The red blood cells contain …

a) iodine

b) plasma

c) haemoglobin

d) platelets

Ans:  c) haemoglobin

4. The impure blood is transported from the right ventricle to the lungs by …..

a) pulmonary veins

b) pulmonary arteries

c) aorta

d) platelets

Ans: b) pulmonary arteries

5. The transport system in plants is called….

a) photosynthesis

b) circulatory system

c) vascular system

d) transpiratory system

Ans: c) vascular system

6. Water rises in the xylem tube due to…

a) photosynthesis

b) gravitation pull

c) respiration

d) transpiration pull

Ans: d) transpiration pull

II. Tick (✓ ) the true statements and cross (✗) the false ones .

1. Unicellular animals have specialized organs to perform various   functions . ✗ 

2. Transpiration is the evaporation of water from the stem of a plant . ✗

3. White blood cells protect the body against infectious diseases. (✓ )

4. The lungs are made up of filters that remove waste from the blood. ✗

5. Pulmonary veins carry oxygen-poor blood to all the parts of the body. ✗

6. Sweat is a waste material . (✓ )

III. Answer the following questions in one sentence.

1. What is blood circulation ?

Ans: The process of pumping blood constantly by the heart through the blood vessels to various parts of the body and back to the heart is called blood circulation .

2. What separates the right and left sides of the heart ?

Ans: A muscular wall called septum separates the right and left sides of the heart .

3. What is the fluid portion of the blood called ?

Ans: The fluid portion of the blood is called plasma .

4. What does RBC stand for ?

Ans: RBC stands for Red Blood Cells .

5. What type of blood cells protect us from infectious diseases ?

Ans: White Blood Cells protect us from infectious diseases.

6. Which organ of the body filters the blood ?

Ans: Kidneys filters the blood.

7. Name the gases that easily bind to the red blood cells .

Ans: Oxygen and Carbon dioxide gases easily bind to the red blood cells.

8. Are xylem bundles present in the roots ?

Ans: Yes , xylem bundles are present in the roots .

IV. Answer the following questions in two sentences.

1. Describe the function of blood platelets ?

Ans: Blood clotting is the main function of blood platelets, which are tiny cell fragments.

2. Why does your heart beat increase when you run ?

Ans: Our heart beat increases when we run because, at such times, our body requires more oxygen to release more energy through respiration, and in order to supply more oxygen, the blood flows faster.

3. What is transpiration ?

Ans: Transpiration is the evaporation of water from the leaves through stomata present on the leaves .

4. What is the function of the lymph nodes ?

Ans: The function of the lymph nodes is to protect the body from disease-causing organisms and harmful substances.

5. List the organs of the excretory system .

Ans: Kidneys, ureters, urinary bladder, and urethra are the organs of the excretory system.

V. Answer the following questions in about four to five sentences .

1. Describe the structure of the human heart with  a diagram .

Ans: The muscular organ that pumps oxygen-rich blood throughout the body is the heart, which is about the size of a fist. Four chambers make up the inside of the heart. The right atrium and left atrium are the names of the upper two chambers. The left ventricle and right ventricle are the names of the lower two chambers. The right and left sides of the heart are separated by a muscular wall known as the septum. A system of blood vessels called arteries and veins transports blood to all areas of the body.

2. How does oxygen-rich blood reach every part of the body ?

Ans: The lungs are where gas exchange first happens. The blood absorbs oxygen and releases carbon dioxide. The pulmonary vein transports the oxygen-rich blood to the left atrium, where it passes through a hole and into the left ventricle. The aorta is then used by the left ventricle to deliver oxygen-rich blood to every area of the body.

3. Explain the composition of blood .

Ans: Blood is mainly composed of – red blood cells (RBC) , white blood cells (WBC)  &  blood platelets .

Red blood cells (RBC) :  These are the most common cells found in the blood . Its main function is transferring  of gases such as oxygen and carbon dioxide into the body .

White blood cells (WBC) :  These are colourless and don’t contain haemoglobin. They are fewer and bigger than the RBC .Their function is to kill germs and defend the body against infectious diseases .

Blood platelets :  They are tiny cell fragments and they play an important role in the clotting of blood .

4. Differentiate between arteries and veins .

Ans:

5. How is blood purified in the kidneys ?

Ans: The kidneys receive blood through the arteries. The tiny tubules in the kidneys filter the blood as it passes through them, removing waste. The end product of this process is urine ,which contains water and waste materials filtered out from the blood .

6. Describe the vascular system in plants .

Ans: The xylem and the phloem are the two main tissue types that make up the vascular system. Water and dissolved minerals are distributed upward through the plant by the xylem, from the roots to the leaves. Food is transported from the leaves to the roots through the phloem.

Extra – Questions | FAQ’s

Pdf Download :

Class 7 Science Other Chapter Notes

Class 7 English Complete Notes