10th Class Biology English Medium Online Test For Full Book With Answers

10th Class Biology English Medium Online Test For Full Book

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 Some plants, known as halophytes, have specialized adaptations to regulate salt levels in their bodies when growing in saline environments. Which of the following is a common adaptation for salt excretion in some halophytes? Increased water absorption Production of more chlorophyll Presence of salt glands Rapid leaf shedding throughout the year
7 The maintenance of turgor pressure within plant cells is essential for structural support and various physiological processes. This is primarily achieved through the process of: Diffusion Active transport Osmosis Plasmolysis
8 Stomata play a crucial role in homeostasis by regulating the exchange of gases and the loss of water. Which cells primarily control the opening and closing of stomata? Epidermal cells Palisade cells Guard cells Xylem cells
9 Which of the following is a common method used by plants to excrete metabolic waste products, particularly when they accumulate in older, senescent parts? Active transport into the soil Storing them in vacuoles and shedding leaves Converting them into useful nutrients Releasing them through root hairs
10 What is the primary process by which plants regulate their internal temperature and water balance by losing water vapor from their aerial parts? Photosynthesis Respiration Transpiration Absorption
11 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
12 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
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