Transportation

Free sample questions

Transportation — sample Science questions with answers

1. Question 1

   What is the main function of xylem in plants?

   • ATransports water and mineral salts from roots to leaves
   • BTransports food from leaves to all parts of the plant
   • CSupports plant structure with thick cell walls
   • DStores excess water for use during drought

   Answer: A. Transports water and mineral salts from roots to leaves

   Xylem is a vascular tissue responsible for transporting water and mineral salts from roots to leaves through root pressure and transpiration pull.

2. Question 2

   The process of water loss in the form of vapor from the leaf surface is known as:

   • ATranspiration
   • BTranslocation
   • CGuttation
   • DPhotosynthesis

   Answer: A. Transpiration

   Transpiration is the process of water loss in the form of water vapor through stomata on leaves. This process helps pull water from roots to leaves.

3. Question 3

   Which of the following factors increases the rate of transpiration EXCEPT:

   • AHigh temperature
   • BHigh air humidity
   • CStrong wind
   • DBright sunlight

   Answer: B. High air humidity

   High air humidity reduces the concentration gradient of water vapor between the leaf and the air, thus decreasing the rate of transpiration.

4. Question 4

   The part of the heart that receives oxygenated blood from the lungs is:

   • ALeft atrium
   • BRight atrium
   • CLeft ventricle
   • DRight ventricle

   Answer: A. Left atrium

   The left atrium receives oxygenated blood from the lungs via the pulmonary vein. The blood is then pumped to the left ventricle for distribution to the entire body.

5. Question 5

   Blood flowing in the pulmonary artery contains:

   • ALow oxygen content and high carbon dioxide content
   • BHigh oxygen content and low carbon dioxide content
   • CSame oxygen and carbon dioxide content as venous blood
   • DPlasma only without blood cells

   Answer: A. Low oxygen content and high carbon dioxide content

   The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for gas exchange. This blood is rich in carbon dioxide and poor in oxygen.