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 submerged aquatic plants primarily exchange gases with their surrounding water environment? Through specialized stomata on their leaves Via lenticels present on their stems Across their general body surface and cell membranes By means of root hairs absorbing dissolved gases
2 In young stems and leaves, the epidermal cells are covered with a waxy layer called the cuticle. What is its primary function concerning gaseous exchange? To absorb gases more efficiently. To prevent excessive water loss, thereby limiting non-stomatal gas exchange. To increase the surface area for gas exchange. To facilitate the entry of carbon dioxide.
3 Which gas is continuously required by plants for the process of cellular respiration, day and night? Carbon dioxide Nitrogen Oxygen Methane
4 The primary role of guard cells in plant leaves is to: Carry out photosynthesis. Absorb water from the atmosphere. Regulate the opening and closing of stomata. Provide structural support to the leaf.
5 How do submerged aquatic plants primarily exchange gases with their environment? Through specialized stomata on their leaves. Via lenticels present on their stems. Across their entire general body surface. Only through their root hairs.
6 What happens to the stomata in most plants during the night? They open wider to release excess oxygen. They remain unchanged, irrespective of light. They close to conserve water and prevent gas loss. They partially open to allow minimal gas exchange.
7 The opening and closing of stomata are regulated by specialized cells known as: Epidermal cells. Mesophyll cells. Guard cells. Xylem cells.
8 At night, when photosynthesis is not occurring, what is the net gaseous exchange between a plant and its environment? Plants take in CO2 and release O2. Plants take in O2 and release CO2. Plants take in both CO2 and O2. There is no gaseous exchange.
9 How do root hair cells primarily obtain oxygen for respiration from the soil? Through direct absorption from atmospheric air. By diffusing from air spaces present in the soil. By actively transporting oxygen from water. By producing their own oxygen through photosynthesis.
10 Which of the following conditions generally causes stomata to open in most plants during the day? Low light intensity. High internal CO2 concentration. High turgor pressure in guard cells. Dry atmospheric conditions.
11 In leaves, what is the primary function of the air spaces between spongy mesophyll cells regarding gaseous exchange? To store excess water. To facilitate the diffusion of gases throughout the leaf. To produce chlorophyll for photosynthesis. To provide structural support to the leaf.
12 The movement of gases like oxygen and carbon dioxide across the cell membranes in plants primarily occurs by the process of: Active transport Osmosis Diffusion Facilitated diffusion
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