Access to the AP 7th Class Science Study Material 7th Lesson Transportation in Animals and Plants Questions and Answers are aligned with the curriculum standards.
AP 7th Class Science 7th Lesson Transportation in Animals and Plants Questions and Answers
AP Board Solutions Class 7 Science Chapter 7 Transportation in Animals and Plants
Exercise
Question 1.
Match structures given in Column -I with functions given in Column – II.
| Column -I | Column -II |
| i) Stomata | a) Absorption of water |
| ii) Xylem | b) Transpiration |
| iii) Root hairs | c) Transport of food |
| iv) Phloem | d) Transport of water |
| e) Synthesis of carbohydrates |
Answer:
| Column -I | Column -II |
| i) Stomata | b) Transpiration |
| ii) Xylem | d) Transport of water |
| iii) Root hairs | a) Absorption of water |
| iv) Phloem | c) Transport of food |
Question 2.
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:
i) Arteries
ii) Red blood
iii) Capillaries
iv) Heart beat
v) Urine
vi) Urea
vii) Urine
viii) Transpiration.
Question 3.
Choose the correct alternative :
a) In plants, water is transported through ?
i) Xylem
ii) Phloem
iii) Stomata
iv) Root hair
Answer:
i) Xylem
b) Water absorption through roots can be increased by keeping the plants ?
i) in the shade
ii) in dim light
iii) under the fan
iv) Covered with a polythene bag’
Answer:
ii) in dim light
Question 4.
Why is transport of materials necessary in a plant or in an animal? Explain.
Answer:
Transport of materials is necessary for plants or animals because due to it the nutrients and oxygen are made available to all the parts of the body. If the transport of necessary nutrients and oxygen does not takes place in the body, the body will not be able to survive.
Question 5.
What will happen if there are no platelets in the blood?
Answer:
The blood platelets are responsible for the clotting of the blood. In case of any injury, a dark red clot is formed because of platelets. If there are less platelets, the blood will keep on flowing leading to tremendous blood loss.
Question 6.
What are stomata? Give two functions of stomata.
Answer:
Stomata are the tiny pores present on the surface of the leaf.
Functions of stomata :
- It helps in the transportation of water.
- It helps in gaseous exchange.
Question 7.
Does transpiration serve any useful function in the plants? Explain.
Answer:
It helps to enhance the absorption of water and dissolved minerals by creation of a suction pull. It helps in getting rid of the excess water. It helps in the transportation of water and minerals to leaves and leaves use the water for photosynthesis. It produces a cooling effect on the plant.
Question 8.
What are the components of blood?
Answer:
The components of blood are:
- Plasma : It is a sticky liquid part of the blood which is pale yellow in colour. It contains 90% water and 3.5% common salt. It also contains enzymes, food, proteins, and other wastes.
- Red blood cells : They are disc shaped cells containing a red coloured pigment called haemoglobin in it. Haemoglobin helps in the transportation of oxygen.
- White blood cells: These are the fighting cells and are also called as warrior cells which protects us from infections caused by bacteria and foreign materials.
- Platelets : They help in clotting of the blood.
Question 9.
Why is blood needed by all the parts of a body?
Answer:
Blood is needy by all the parts of a body because:
- It helps in carrying oxygen from the lungs to the cells of the body.
- It carries digested food to various parts of the body for absorption.
- It helps in the transportation of waste for removal from the body.
- It contains platelets which helps in the clotting of the blood.
Question 10.
What makes the blood look red?
Answer:
A red pigment called haemoglobin gives the blood its red colour. This pigment helps in carrying oxygen to various parts of the body by blood.
Question 11.
Describe the function of the heart.
Answer:
The right auricle and ventricle receive blood with carbon dioxide from all parts of the body. The collected blood is then pumped to the lungs for the purification. In the lungs, the exchange of gases takes place and purified blood is sent back to left auricle. It pumps it to the left ventricle which in turn pumps off the purified blood to all parts of the body through arteries.
Question 12.
Why is it necessary to excrete waste products?
Answer:
It is necessary to excrete waste products because they are toxic. If these toxic materials are not removed from the body, they get mixed with the blood and can damage the cells of the body.
Question 13.
Draw a diagram of the human excretory system and label the various parts.
Answer:
Question given in the lesson
Page No. 144
Question 1.
Why is the colour of blood red ?
Answer:
The colour of the blood is red, due to the presence of respiratory pigment called haemoglobin.
Question 2.
I am confused! I have learnt that an artery always carries oxygen-rich blood.
Answer:
Pulmonary artery carry carbon dioxide rich blood from the heart to the lungs whereas arteries carry oxygen rich blood from the heart to the all body parts. Both are different. Similarly pulmonary veins carry oxygen rich blood from lungs to the heart whereas veins carry carbon dioxide rich blood from all parts of body to the heart.
Page No. 146
Question 3.
Paheli wonders which side of the heart will have oxygen-rich blood and which side will have carbon dioxide-rich blood.
Answer:
Left side of heart has blood rich in oxygen and right side of heart has blood rich in carbon dioxide.
Page No. 152
Question 4.
Paheli wants to know whether other animals also urinate?
Answer:
Yes, the mammals (animals like pigs, cow, cat, sheep, horse, etc. that have mammary glands) also urinate.
Page No. 154
Question 5.
Boojho thinks that plants may have pipes to transport water to the entire plant like we have in our homes for the supply of water.
Answer:
Yes, plants have pipe – like vessels to transport water and nutrients from roots to the leaves.Roots absorb water and nutrients from soil and transport to the all parts of plants through vessels. These vessels are made of special cells and form vascular tissues. These vascular tissues transport water and nutrients in the plants and it is called xylem.
Page No. 156
Question 6.
Paheli says her mother puts ladyfinger and other vegetables in water if they are somewhat dry.;She wants to know how water enters into them.
Answer:
Ladyfinger and other vegetables are put into water to moisture them through the process of osmosis. Osmosis is the movement of water molecule from an area of higher concentration to the lower concentration through semi-permeable membrane.
Question 7.
Boojho wants to know why plants absorb a large quantity of water from the soil, then give it off by transpiration!
Answer:
Because transpiration helps in suction of water.
Extended Learning – Activities and Projects
Question 1.
Find out about blood groups and their importance.
Answer:
Within the ABO group, four major categories and divided into eight common blood types: A,B,O and AB . Here, alphabet A and B refers to certain substances which are present in the red blood cells. The blood group AB contains both A and B substances in the RBCs whereas, both these substances are absent in the blood group 0.
The grouping is very important when it comes to having a blood transfusion. If the blood is given to a patient that has a blood type that is incompatible with the blood type of the blood that the patient refused, it can cause an intravenous clumping in the patient’s blood which can be fatal.
Question 2.
When a person suffers from chest pain, the doctor immediately takes an ECG. Visit a doctor and get information about ECG. You may even look up an encyclopaedia or the internet.
Answer:
An electrocardiogram (ECG) is a medical test that detects cardiac abnormalities by measuring the electrical activity generated by the heart as it a contract.The machine that records the patient’s ECG is called electrocardiograph. The electrocardiograph records the electrical activity of the heart muscle and displays this data as a trance on a screen or on paper.
This data is interpreted by a medical practitioner. The ECG’ from healthy hearts, have a characteristic shape. Any irregularity in the heart rhythm or damage to the heart muscle can change the electrical activity of the heart so that the shape of the ECG is changed. Recommend an ECG for people who may be at risk of a heart disease because there is a family history of the heart disease, or because they smoke, are overweight, or have diabetes, high cholesterol or high blood pressure.
Activities
Activity 7.1 Page No: 142
Question 1.
Place the middle and index finger of your right hand on the inner side of your left wrist (Figure). Can you feel some throbbing movements? Why do you think there is throbbing?
Answer:
Yes, I feel some throbbing movements.The throbbing is called the pulse and it is due to the blood flowing in the arteries.
Question 2.
Record your own pulse beats per minute and those of your classmates. Compare the values you obtained and insert them in Table.
| S.No | Name | Pulse per minute |
| 1) | ||
| 2) | ||
| 3) | ||
| 4) |
Answer:
| S.No | Name | Pulse per minute |
| 1) | Pradeep | 73 |
| 2) | Suma | 70 |
| 3) | Ravi Teja | 71 |
| 4) | Priya | 72 |
| 5) | Dilip | 74 |
Activity 7.2 Page No: 148
Question 3.
Take a small funnel of 6 – 7 cm in diameter. Fix a rubber tube (50 cm long) tightly on the stem of the funnel. Stretch a rubber sheet (or a balloon) on the mouth of the funnel and fix it tightly with a rubber band. Put the open end of the tube on one of your ears. Place the mouth of the funnel on your chest near the heart. Now try to listen carefully. Do you hear a regular thumping sound ? The sound is that of heart beats. How many times did your heart beat in a minute ? Count again after running for 4 – 5 minutes. Compare your observations.
Answer:
Aim : To prepare a simple stethoscope of your own.
Materials required : A glass funnel, rubber tubes and a piece of rubber sheet.
Procedure :
- Take a small funnel of 6 – 7 cm in diameter.
- Fix a rubber tube (50 cm long) tightly on the stem of the funnel.
- Stretch a rubber sheet (or a balloon) on the mouth of the funnel and fix it tightly with a rubber band.
- Put the open end of the tube on one of your ears.
- Place the mouth of the funnel on your chest near the heart.
- Now try to listen carefully.
- Count the heart beats per minute.
- Now run for 4 – 5 minutes and again count your heart beats.
- Your stethoscope is ready.
Observation: We observe that the thumping sound is heartbeat. At resting,’the average heartbeat of an adult person is 72-80 beats per minute. It can also be observed that the heart beat increases after running.
Conclusion : From the activity, we can conclude that the pulse rate of an adult person while resting is 72 to 80 betas per minute. A physical activity demands more oxygen. Hence, heart beats faster.
Activity 7.3 Page No: 156
Question 4.
We would require a glass tumbler, water, red ink, a tender herb (E.g: Balsam), and a blade for this activity.
Pour water to fill one-third of the tumbler. Add a few drops of red ink to the water. Cut the base of the stem of the herb and place it in the glass. Observe it the next day. Does any part of the herb appear red? If yes, how do you think the colour reached there ?
Answer:
Aim : To show that water moves up the stem.
Materials required : glass tumbler, water, red ink, a tender herb (e.g., Balsam).
Procedure :
- Pour water to fill one-third of the tumbler.
- Add a few drops of red ink to the water.
- Cut the base of the stem of the herb and place it in the glass as shown in Figure.
- Observe it the next day.
Observation : We observe a slight red colour appears on the stem. When will cpntest colour is visible inside the stem.
Conclusion : From the above activity, we can conclude that the coloured water moved up in the stem. It implies that stem conducts water. We also analysed that just like red ink moved up the stem, the water with dissolved minerals also get transported through the stem. This transporter is through the narrow tubes called xylem.