Gaseous Exchange With Answers

Gaseous Exchange

Sr. # Questions Answers Choice
1 How do the cells of plant roots primarily obtain the oxygen required for cellular respiration? Directly from the atmosphere through lenticels on roots Through diffusion from air spaces in the soil Transported from leaves via phloem Produced during photosynthesis in root cells
2 The turgor pressure within guard cells directly controls which aspect of stomatal function? Rate of transpiration Size of the stomatal pore Production of glucose Absorption of water from roots
3 During periods of intense photosynthesis, what is the net gaseous exchange of a plant leaf with its environment? Takes in O2, releases CO2 Takes in CO2, releases O2 Releases both O2 and CO2 Takes in both O2 and CO2
4 Lenticels are small pores found on the surface of which plant structures, enabling gaseous exchange? Young leaves Flower petals Woody stems and roots Fruit skins
5 After entering stomata, through which pathway do gases primarily reach the mesophyll cells in a plant leaf? Vascular bundles Intercellular air spaces Xylem vessels Phloem tubes
6 Which of the following is considered the leading cause of lung cancer and other chronic respiratory diseases? Exposure to cold weather Excessive consumption of sugary drinks Smoking tobacco Lack of physical exercise
7 What is the main characteristic of pneumonia, a lung infection? Permanent dilation of bronchi Inflammation of the lining of the lungs and fluid accumulation in alveoli Spasms of the bronchial tubes Destruction of the cilia in the trachea
8 In which respiratory disorder do the walls of the alveoli break down, leading to a reduction in the surface area for gas exchange? Asthma Bronchitis Pneumonia Emphysema
9 Chronic bronchitis is primarily caused by prolonged exposure to which of the following? Viral infections Bacterial infections Air pollution and smoking Genetic predisposition
10 Which respiratory disorder is characterized by inflammation and narrowing of the airways, often triggered by allergens or exercise? Emphysema Bronchitis Asthma Pneumonia
11 What structural feature prevents the trachea from collapsing and ensures a continuous airway? Smooth muscles Elastic ligaments C-shaped cartilaginous rings Bone plates
12 Which gas diffuses from the alveoli into the blood capillaries during the process of gaseous exchange? Carbon dioxide Oxygen Nitrogen Methane
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