Important Questions for CBSE Class 7 Science Chapter 11 – Transportation in Animals and Plants

Class 7 Science Chapter 11 Extra Question Answer – Transportation in Animals and Plants

Science is an extensive subject with a variety of different topics covering Physics, Chemistry and Biology subjects. So to excel in this subject, students must go through the chapter and understand the underlying concept to get a good understanding of the chapter.. The more students are able to relate to real-life examples of science and understand the foundational concepts, the more effectively they can retain the topic.

Transportation in plants and animals class 7 extra questions and answers is an essential chapter in Class 7 Science. This chapter highlights the importance of circulatory and excretory systems in humans and their processes. It is also one of the chapters in which it’s easier for students to score full marks. Students will learn about the following topics in this chapter:

• The circulatory system in humans
• Excretory system in humans
• The transportation system in plants

Students struggle to score good marks in exams as they do not care to understand the concepts and learn chapters in haste. . To help students with their studies, Extramarks, a leading educational platform, provides high-quality educational resources.

For well-rounded preparations for exams, students are advised to solve class 7 science chapter 11 extra questions. It’s also helpful for students to study Chapter 11 from the NCERT textbook and NCERT exemplar. To score good marks in exams, students should also practice CBSE past years’ question papers along with Chapter 11 Class 7 Science Important Questions. We have all the answers to your queries. This encourages the students to master the topic and increases their confidence in achieving a high grade.

Class 7 Science Chapter 11 Important Questions with Solutions

Science is considered to be a bit of a challenging subject involving a lot of complex theories. Sometimes it requires solving chapter-end problems, and revisions for students to remember the concept. To make the process of question-solving easier and more efficient, the Extramarks team have curated questions from various sources and collated them in our question bank Science Class 7 Chapter 11 Important Questions. These questions are from NCERT textbook, exemplar, past years’ questions, etc.

Following are some of the questions and their solutions from   Chapter 11 Important Questions for Class 7 Science prepared by in-house subject experts of Extramarks.

Question 1: Why is the transport of materials necessary in a plant or in an animal? Explain.

Answer 1: Transporting minerals to every cell in plants and animals is important as all the cells require specific nutrients and a regular supply of oxygen for releasing energy through respiration.

The food we intake is broken down into smaller components for easy absorption by cells.

The oxygen we breathe also is transported to all the cells of the body. Organisms also require the execution of constant removal of waste materials such as carbon dioxide, urea and uric acid.

For the transportation of materials, humans have a very complex and specialized system, and in plants, transportation of water and minerals is performed through a vascular tissue system.

Question 2: What will happen if no platelets are in the blood?

Answer 2: Absence of platelets or lack of platelets in blood results in the blood being unable to clot. Blood clots are because platelets are present in the blood, which are responsible for releasing a few chemicals which clot the blood. Hence, if there are no platelets present in the blood, the blood will not clot and will not be able to prevent further bleeding.

Question 3: 

Fill in the blanks.

(i) The blood from the heart is transported to all parts of the body by the _____________ .

(ii) Haemoglobin is present in _____________ cells.

(iii) Arteries and veins are joined by a network of _____________ .

(iv) The rhythmic expansion and contraction of the heart is called _____________.

(v) The main excretory product in human beings is _____________.

(vi) Sweat contains water and _____________ .

(vii) Kidneys eliminate the waste materials in the liquid form called _____________ .

(viii) Water reaches great heights in the trees because of suction pull caused by _____________ .

Answer 3: 

i) The blood from the heart is transported to all parts of the body by the

(ii) Haemoglobin is present in red blood cells.

(iii) Arteries and veins are joined by a network of capillaries.

(iv) The rhythmic expansion and contraction of the heart is called the heartbeat.

(v) The main excretory product in human beings is urea.

(vi) Sweat contains water and salts.

(vii) Kidneys eliminate the waste materials in the liquid form called urine.

(viii) Water reaches great heights in the trees because of suction pull caused by transpiration.

Question 4: What are stomata? Give two functions of stomata.

Answer 4:  Tiny pores on the lower side of the leaf’s surface are known as stomata.

The functions of stomata are 

1. Stomata help in the exchange of gases necessary for the respiration of the plant.
2. Evaporation of water from the surface of the leaf to the atmosphere also occurs through stomata. This process is also known as transpiration.

Question 5: Does transpiration serve any useful function in plants? Explain.

Answer 5:  Transpiration is the process of evaporation of water from the plant to the atmosphere through the stomata majorly present on the lower surface of the leaf.

Transpiration is responsible for the loss of water the plants absorb. . Transpiration is also important for plants as it helps in the movement of water throughout the plant. As a result, transpiration helps in the distribution of water throughout the plant body.

It also plays an important role in the cooling of the plant.

Question 6: What are the components of blood?

Answer 6: There are three components of blood those are:

1. Red Blood Cells (RBCs) 2. White Blood Cells (WBCs) 3. Platelets

1. Red Blood Cells (RBCs): Red blood cells in the blood are the most abundant cells present. It contains a red pigment known as haemoglobin that binds with oxygen.  It’s the haemoglobin which carries oxygen and transports it to all parts of the body.
2. White Blood Cells (WBCs): White blood cells are colourless cells without haemoglobin. Their main function is to fight against infections and protect the body from foreign particles like bacteria and viruses.
3. Platelets: Platelets are the smallest cells present in the blood. Their main function is to prevent bleeding.

Question 7: Why is blood needed by all the parts of a body?

Answer 7:  Blood is the main medium of transportation  for the body. It is needed by all body parts as it performs the following important functions:

1. Blood transports oxygen from the lungs to all the cells in our body.
2. It carries carbon-di-oxide from the body back to the lungs so it can be exhaled easily.
3. Blood also regulates heat, thus helping in thermoregulation.
4. Blood contains WBCs responsible for fighting diseases and infections.

Question 8: Describe the function of the heart.

Answer 8: The heart is a muscular organ responsible for pumping blood and keeping a person alive. The human heart has four chambers; the two upper chambers are called the right and left atrium, respectively, and the two lower chambers are called the right and left ventricles. 

The flow of blood in the human heart:

The right atrium receives deoxygenated carbon dioxide-rich blood from the body through the pulmonary artery. Blood from the right atrium is pumped to the right ventricle, which pumps blood to the lungs.

exchanging gases takes place in the lungs, and oxygen-rich blood exits the lungs and reaches the left atrium through the pulmonary vein. Blood is then pumped to the left ventricle, from where blood is pumped to all parts of the body.

Hence, the rhythmic contraction and expansion of the heart transports blood to all parts of the body and also causes the sound of a heartbeat.

Question 9: Why is it necessary to excrete waste products?

Answer 9:  All cells in our body excrete waste while performing their function. This, although present in low quantity, is toxic for our body hence the need to excrete them. . The process of removing waste products produced in the cells of living organisms is called excretion.

Question 10: 

The muscular tube through which stored urine is passed out of the body is called –

(a) kidney

(b) ureter

(c) urethra

(d) urinary bladder

Answer 10:  ( c) Urethra

The waste present in our body is removed by the blood capillaries present in our kidneys. From the kidneys, the urine reaches the urinary bladder through tube-like structures known as ureters. The stored urine is then passed out through a urinary opening at the end of a muscular tube called the urethra.

Question 11: They are pipe-like, consisting of a group of specialised cells. They transport substances and form two-way traffic in plants. Which of the following terms qualify for the features mentioned above?

(a) Xylem tissue

(b) Vascular tissue

(c) Root hairs

(d) Phloem tissue

Answer 11:  (d) Phloem tissue

Phloem tissue consists of a group of specialised cells. Sieve tubes make up the majority of the phloem. They are elongated tubular cells which act as conducting channels of phloem through which food is transported. The contents of the phloem can move upwards and downwards; hence, they form two-way traffic in plants.

Question 12: In which of the following parts of the human body are sweat glands absent?

(a) Scalp

(b) Armpits

(c) Lips

(d) Palms

Answer 12:  ( c) Lips

Sweat glands function for the production of sweat. Lips lack the presence of sweat glands. Therefore lips do not sweat.

Question 13: Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?

Answer 13:Arteries do not have valves. Yet the blood flows in only one direction as opposed to the unidirectional, rapid blood flow found in arteries. 

Question 14: Arrange the following statements in the correct order in which they occur during the formation and removal of urine in human beings.

(a) Ureters carry urine to the urinary bladder.

(b) Wastes dissolved in water are filtered out as urine in the kidneys.

(c) Urine stored in the urinary bladder is passed out through the urinary opening at the end of the urethra.

(d) Blood containing useful and harmful substances reaches the kidneys for filtration.

(e) Useful substances are absorbed back into the blood.

Answer 14:

(d) Blood containing useful and harmful substances reaches the kidneys for filtration.

(e) Useful substances are absorbed back into the blood.

(b) Wastes dissolved in water are filtered out as urine in the kidneys.

(a) Ureters carry urine to the urinary bladder.

(c) Urine stored in the urinary bladder is passed out through the urinary opening at the end of the urethra.

Question 15: 

Name the process and the organ which helps in removing the following wastes from the body.

(a) Carbon dioxide

(b) Undigested food

(c) Urine

(d) Sweat

Answer 15: 

Question 16: Fill in the blanks of the following paragraph using just two words – arteries and veins.

___(a)___ carry oxygen-rich blood from the heart to all parts of the body, and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___, which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.

Answer 16: 

a)Arteries carry oxygen-rich blood from the heart to all parts of the body, and b)veins carry carbon dioxide-rich blood from all parts of the body back to the heart. c)Veins have thin walls, and d)arteries have thick elastic walls. Blood flows at high pressure in e)arteries. Valves are present in f)veins which allow blood to flow only towards the heart. g)Arteries divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form h)veins.

Question 17: Define pulse.

Answer 17: Throbbing or the rhythmic contraction and dilation that occurs in the arteries resulting from the heartbeat is called a pulse.

Question 18: Define osmoregulation.

Answer 18: Maintaining the osmotic pressure of the body fluids by controlling the amount of water and electrolyte in the body is called osmoregulation.

Question 19: Explain Dialysis.

Answer 19: Dialysis is a medical treatment performed in patients with weak or faulty kidneys. It is an artificial machine containing a tank with a solution of water glucose and salt with a concentration similar to blood. The patient’s blood is taken through the artery and is allowed to pass through the solution for the removal of waste. The purified blood devoid of any impurities is then pumped back to the vein. Dialysis is continued until all the blood has been purified.

Question 20: Why do sponges and hydra lack blood?

Answer 20: Animals such as sponges and hydra do not possess any circulatory system as their habitat, water in which they live brings food and oxygen, and it enters through pores present on their body surface, and the waste is carried out. .

Question 21: Differentiate between Artery and Vein.

Answer 21: The following are the differences between  artery and vein: 

Question 22: Ammonia is excreted in gaseous form by:

• Humans

• Pisces

• Reptiles

• Aves

Answer 22: b) Pisces

Ammonia is excreted in gaseous form in Pisces like fishes as it gets directly dissolved in water.

Animals like snakes and lizards excrete uric acid, which is a semi-solid, white-coloured compound. 

Humans secrete waste in the form of urea.

Benefits of Solving Class 7 Science Chapter 11 Important Questions

Extramarks leaves no stone unturned when it comes to providing the best learning material with unmatchable speed and accuracy for students irrespective of the class and subject. Important Questions Class 7 Science Chapter 11 is created by Extramarks to aid students in scoring good marks in exams. This question bank has been curated to include questions which have a higher likelihood of appearing in exams. Therefore it is extremely critical for students to practice Important Questions Class 7 Science Chapter 11 before taking exams.

Given below are a few benefits of solving Important Questions Class 7 Science Chapter 11: 

1. Question bank for class 7 science chapter 11 question answer is created by subject experts to help students fully revise the chapter while solving the questions. The solutions provided after the questions contain not only the answer but also the explanation of how that answer is achieved.
2. Through solving Important Questions in Class 7 Science Chapter 11, students learn how to apply concepts learnt from the NCERT textbook. Using these questions as a guide, students can improve their understanding of the concept and thus perform well in exams.
3. This list of Important Questions Class 7 Science Chapter 11 contains questions from every  chapter, and covers each and every topic.. This is quite useful for students as they get to revise the whole chapter in one go..
4. The question bank contains questions of all formats, i.e. MCQs, very short answer questions, short answer type questions, and long answer type questions. So students get a real-exam type practice and it helps them to better perform in the actual exam.This encourages the students to master the topic and increases their confidence in achieving a high grade. 

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