CG Board Class 7 Science Transportation in Living Organisms question answers , fill in the blanks , true false etc. for your exams.
Choose the correct answer-
1. Transportation in unicellular animals is
(a) by closed transportation (b) by absorption
(c) by diffusion (d) by distillation
Answer – (c) by diffusion
2. Transportation in human beings is
(a) through water (b) through muscles
(c) through nerves (d) through blood
Answer – (d) through blood
3. Main part of blood transportation system in human beings is
(a) heart (b) Capillaries
(c) Arteries (d) Veins
Answer – (a) heart
4. In non-chordate animals, circulation of blood is
(a) closed circulation (b) open circulation
(c) Both open and closed circulations (d) none of these
Answer – (b) open circulation
5. The meaning of deficiency of blood in the body of a human being is-
(a) deficiency of blood in the body
(b) deficiency of plasma in blood
(c) deficiency of white blood cells in blood
(d) deficiency of haemoglobin in red blood cells
Answer – (a) deficiency of blood in the body
Fill in the blanks:-
1. When we cut the bark of a stem then with it ……………..is also destroyed along with it.[phloem]
2. Blood is a ……………tissue. [connective]
3. …………….help in clotting of blood. [platelets]
4. Oxygenated blood is circulated to all body parts through …………..[arteries]
5. ………………….. blood is brought to the heart from all body parts through veins.[deoxygenated]
Correct the following statements :-
1. Chordate animals have open blood circulation.
Correction: Chordate animals have closed blood circulation.
2. Blood donation is required for saving the life of a healthy man.
Correction: Blood donation is required for saving the life of a person in need, not necessarily a healthy man.
3. Pressure of blood in veins is called blood pressure.
Correction: Blood pressure is the pressure of blood in arteries, not veins.
4. Capillaries join together to make small vessels.
Correction: Capillaries join together to form larger vessels, known as veins.
Answer the following questions
How many types of blood corpuscles are there? Write their functions.
Types of Blood Corpuscles and Their Functions:
Red Blood Corpuscles (RBCs): Function: RBCs, or erythrocytes, contain hemoglobin, which binds with oxygen in the lungs and transports it to various tissues and organs. They also help in the transport of carbon dioxide back to the lungs for exhalation.
b. White Blood Corpuscles (WBCs): Function: WBCs, or leukocytes, play a crucial role in the immune system. They defend the body against infections, bacteria, viruses, and other foreign substances. WBCs are involved in the process of phagocytosis and the production of antibodies.
c. Platelets: Function: Platelets are involved in blood clotting. When there is an injury, platelets adhere to the damaged area, forming a clot to prevent excessive bleeding.
What do you mean by open and closed blood circulation?
In an open circulatory system, the blood directly comes in contact with body tissues and organs. The blood is not always enclosed in vessels. Examples: Insects and some mollusks.
In a closed circulatory system, the blood is enclosed in vessels (arteries, veins, and capillaries) and does not directly contact body tissues. Examples: Humans and other vertebrates.
What do you mean by blood donation?
Blood donation refers to the voluntary act of giving a portion of one’s blood, typically through a blood donation process. The collected blood is used for various medical purposes, including surgeries, treatments, and emergency situations.
What are the differences between veins and arteries ?
What do you understand by pulse rate?
Pulse rate is the number of times the heart beats per minute, typically measured by palpating an artery, often the radial artery in the wrist. It serves as an indicator of heart rate and cardiovascular health. A resting person usually has a pulse rate between 60 and 100 beats per minute.
What is the role of lungs in the blood circulatory system?
Lungs play a important role in the blood circulatory system by exchange of gases. Oxygenated blood from the lungs is transported to the heart, where it is then pumped to various parts of the body. Simultaneously, deoxygenated blood, rich in carbon dioxide, returns from the body to the lungs. In the lungs, carbon dioxide is expelled, and the blood is oxygenated again, ensuring a continuous supply of oxygen to the body.
What will happen if the capacity of the cardiac muscles to contract and relax gets weakened?
If the capacity of the cardiac muscles to contract and relax gets weakened, the pumping efficiency of the heart decreases. This can lead to insufficient blood circulation, resulting in reduced oxygen supply to body tissues and organs. It may cause fatigue, shortness of breath, and, in severe cases, organ damage due to inadequate oxygen and nutrient delivery.
