Class 7 Science Chapter 11 Ncert solutions
Class 7 Science Chapter 11 Transportation in Animals And Plants Question and Answers / Notes
Q1 :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|
|(iv) Phloem||(c) Transport of food|
|(iii) Root hairs
||(d) Transport of water|
|(e) Synthesis of carbohydrates|
Answers – I – Transpiration , ii – Transport of water , iii – Transport of food , iv – Transport of water
Q2 :Fill in the blanks.
- The blood from the heart is transported to all parts of the body by the______.[arteries]
- Haemoglobin is present in ______ cells. [ red blood]
- Arteries and veins are joined by a network of ______.[capillaries]
- The rhythmic expansion and contraction of the heart is called ___ _ _.[heart beat]
- The main excretory product in human beings is ______.[urea]
- Sweat contains water and ______.[salts]
- Kidneys eliminate the waste materials in the liquid form called ______.[urine]
- Water reaches great heights in the trees because of suction pull caused by ______.[transpiration]
Q3 :Choose the correct option:
(a) In plants, water is transported through
- root hair
(b) Water absorption through roots can be increased by keeping the plants
- in the shade
- in dim light
- under the fan
- covered with a polythene bag
Q4 :Why is transport of materials necessary in a plant or in an animal? Explain.
Both plants and animals require a regular supply of nutrients and oxygen for emitting energy through respiration.Through transpiration, nutrients and oxygen are made available to all parts of the body. It is impossible for the body to survive if it does not transport nutrients and oxygen.
Q5 :What will happen if there are no platelets in the blood?
It is impossible for the blood to clot without platelets. Platelets are responsible for clotting. As a result, they release chemicals that cause the blood to clot. Clotting agents form a clot that prevents bleeding.
Q6 :What are stomata? Give two functions of stomata.
A leaf’s surface has tiny pores called stomata.
Stomata perform the following functions:
- Stomata help in the exchange of gases.
- Stomata allow water to evaporate from the leaf surface.
Q7 :Does transpiration serve any useful function in the plants? Explain.
- It promotes water and mineral absorption
- This helps get rid of excess water.
- Water and minerals are transported to leaves, which use the water for photosynthesis.
- It also helps in cooling the plant.
Q8 : What are the components of blood?
The main components of blood are
Plasma :The blood is composed of a fluid called plasma, in which different types of cells are suspended.
- Red blood cells (RBC): contain a red pigment called haemoglobin. Blood carries oxygen to all parts of the body through hemoglobin. It will be difficult for the body to provide oxygen efficiently to all the cells without haemoglobin. Haemoglobin makes blood appear red.
- White Blood Cells: The blood also has white blood cells (WBC) which fight against germs that may enter our body.
- Platelets are the cells within the blood which cause the clot to form.
Q9 :Why is blood needed by all the parts of a body?
Blood is an essential part of the transport system of our bodies and is needed in all parts of the body. These are some of its important functions:
- It transports oxygen from the lungs to all the cells in the body.
- It allows waste products, such as CO2, to be easily exhaled through the lungs.
- It delivers heat to the body, regulating its temperature.
- It also protects against diseases and infections.
Q10 :What makes the blood look red?
Blood appears red due to haemoglobin, a pigment in red blood cells (RBCs). It carries oxygen through the body and delivers it to all parts.
Q11 :Describe the function of the heart.
The human heart is divided into four chambers. The upper two chambers are called right and left atrium and the lower two chambers are called the right and left ventricles. Hearts pump blood continuously to carry various substances, which include other substances that it transports. Deoxygenated blood is pumped to the lungs for oxygenation, and oxygenated blood is returned to the heart. The heart pumps oxygenated blood to different parts of the body.
Q12 :Why is it necessary to excrete waste products?
Every cell in our body produces waste products. It is toxic for the body to contain these waste products, so they must be excreted. Living organisms eliminate waste products produced in their cells through excretion.
- Class 7 Science Chapter 10 Respiration in Organisms
- Class 7 Science Chapter 9 Soil
- Class 7 Science Chapter 8 Winds Storms and Cyclones.
- Class 7 Science Weather Climate and Adaptation
Transportation in Animals And Plants Extra Questions/ Points