transportation in animals class7 sci t2

7/28/2019 Transportation in Animals Class7 Sci t2

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BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034

CLASS 7TH

NOTES SCIENCE 2013-2014

CHAPTER: TRANSPORTATION IN PLANTS AND ANIMALS

Q1. Why is color of blood red?

A. Blood has a Pigment known as hemoglobin that gives red color to it.

Q2. What does blood consist of?

A. Blood consists of Red blood cells, white blood cells, platelets and plasma.

Q3. What is removed along with water as sweat?A. Extra salts are removed along with water as sweat.

Q4. What is the function of stethoscope?A. Stethoscope is used by doctors to amplify heart beat so that it can be analysed

properly.

Q5. What is pulse?

A. Throbbing that occurs in arteries due to flowing of blood is called pulse.

Q6. Why is transport of materials necessary in a plant or in an animal?A. All organisms need food, water and oxygen for survival. They need to transport all

these to various parts of their body.

Q7. What are the functions of white blood cells?A. White blood cells fight against the infection or germs in the body, thereby providing

immunity.

Q8. How is clot formed?A. Clot is produced as an action of platelets during any external injury to prevent

excessive loss of blood.

Q9.What is the main function of heart?A. Heart is the main pumping organ for blood to be circulated as blood is required to be

sent to all the parts of the body so as carry on all the important functions of body.

Q10. Why is it necessary to excrete waste products?

A. During various activities which are performed within body, certain by products are

produced. Some of these products are toxic and are required to be thrown out.

Q11. What is transpiration? How is it useful to plants?

A. It is the process of removal of extra water in the form of water vapours through

stomata in plants. This process helps in eliminating extra water and keeping plant cooler.

Q12. What is meant by excretion?

A. It is the process of removal of toxic substances from the body.


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Q13. Why is blood needed by all the parts of the body?A. Blood helps in transport of various material such as, digested food from the intestine,

oxygen and carbon dioxide from their respective sites, watses material for excretion.

These are to be transported to ensure proper functioning in the body.

Q14. Why do plants absorb a large quantity of water from the soil?

A. Plants remove lots of water by the process of transpiration. This is why plants requireto absorb large quantity of water from the soil.

Q15. Differentiate between:

1. arteries and veins

Arteries Veins

They carry blood away from heart They carry blood towards heart.

They carry oxygenated blood exceptpulmonary artery

They carry deoxygenated blood exceptpulmonary vein

They are thick walled and deeply

seated

They are thin walled and superficially

located beneath skin

They lack valves They have valves to prevent backflow

of blood.

2. atrium and ventricle

Atrium Ventricle

They are the upper chambers of heart They are the lower chambers of heart.

They receive blood from various body

parts

They distribute blood to various parts

of the body

They are thin walled They are thick walled

3. RBC and WBC

RBC WBC

They are red in colour They are colourless

They have hemoglobin They lack hemoglobin

They help in transport of gases They help in fighting against germs

and infection

4. xylem and phloemXylem Phloem

It transports water and minerals It transports food

It has unidirectional movement. It has multidirectional movement.


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Q16. Why do sponges and hydra not have blood?

A. Animals such as sponges and hydra do not possess any circulatory system. The water

in which they live brings food and oxygen as it enter their body the water carries awaywaste materials and carbon dioxide as it moves out.

Q17. Why valves present in veins?A. Valves are present in veins to prevent backflow of blood in tissues.

Q18. Draw the diagram of human heart and label all the parts.

A.

.Q19. Enlist the functions of blood.

A. It transports substances like digested food from the small intestine to the other parts.It carries oxygen and carbon dioxide to their respective organs and tissues

It transports wastes for removal from the body.

Q20. Describe the circulation of blood through heart and body.

A. The blood vessels (arteries, veins, and capillaries) are responsible for the delivery of

oxygen and nutrients to the tissue. Oxygen-rich blood enters the blood vessels through

the heart's main artery called the aorta. The forceful contraction of the heart's left

ventricle forces the blood into the aorta which then branches into many smaller arterieswhich run throughout the body. The inside layer of an artery is very smooth, allowing the

blood to flow quickly. The outside layer of an artery is very strong, allowing the blood to

flow forcefully. The oxygen-rich blood enters the capillaries where the oxygen and

nutrients are released. The waste products are collected and the waste-rich blood flows


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into the veins in order to circulate back to the heart which further goes to lungs forpurification.

Q21. Name the types of blood vessels and their functions.A. There are three varieties of blood vessels: arteries, veins, and capillaries. During bloodcirculation, the arteries carry blood away from the heart. The capillaries connect the

arteries to veins. Finally, the veins carry the blood back to the heart.

Q22. Explain the process of urine formation in man.A. During circulation, blood passes through the kidneys in order to deposit used and

unwanted water, minerals, and a nitrogen-rich molecule called urea. The kidneys filterthe wastes from the blood, forming a liquid called urine. The kidneys funnel the urine

into the bladder along two separate tubes called ureters. The bladder stores the urine until

muscular contractions force the urine out of the body through the urethra. Each day, your

kidneys produce about 1.5 liters of urine. All of it needs to be removed from your system.This occurs through urination.

Q23. Draw a well labeled diagram of human excretory system and discuss the functions

of all the parts.

A.


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Q24. Discuss the flow of blood through heart.

A. The heart pumps oxygenated blood to the body and deoxygenated blood to the lungs.

In the human heart there is one atrium and one ventricle for each circulation, and withboth a systemic and a pulmonary circulation there are four chambers in total: left atrium,left ventricle, right atrium and right ventricle. The right atrium is the upper chamber of

the right side of the heart. The blood that is returned to the right atrium is deoxygenated(poor in oxygen) and passed into the right ventricle to be pumped through the pulmonary

artery to the lungs for re-oxygenation and removal of carbon dioxide. The left atriumreceives newly oxygenated blood from the lungs as well as the pulmonary vein which is

passed into the strong left ventricle to be pumped through the aorta to the different organsof the body.

transportation in animals class7 sci t2

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