The question asks to identify the scientist who discovered the role of sunlight in purifying air through plant activity. This refers to early experiments in photosynthesis, specifically the understanding that light is essential for plants to release oxygen and "purify" the air.
B) Jan Ingenhousz is credited with demonstrating that sunlight is essential for plants to purify air (release oxygen).
The question asks to identify the primary pigment responsible for photosynthesis. Photosynthesis is the process by which plants convert light energy into chemical energy. This process relies on various pigments, but one plays a central role.
D) Chlorophyll a is the primary photosynthetic pigment because it directly converts light energy into chemical energy and is found in the reaction centers of both photosystems.
The question asks about the specific location within the chloroplast where ATP and NADPH are produced during the light-dependent reactions of photosynthesis. Understanding the structure of the chloroplast and the stages of photosynthesis is key to answering this.
C) Thylakoid membrane — The thylakoid membrane is where the light-dependent reactions occur. Photosystems, electron transport chain components, and ATP synthase are all embedded in this membrane, facilitating the production of ATP and NADPH.
The question asks for the first stable product formed during the Calvin Cycle. This requires knowledge of the initial steps of carbon fixation in photosynthesis, specifically the Calvin Cycle (also known as the C3 cycle).
Correct Option: C) PGA (3-Phosphoglycerate) is the first stable product formed during the Calvin Cycle. It is a three-carbon compound, which is why the Calvin cycle is also known as the C3 cycle.
The question asks about leaf modifications in desert plants to prevent water loss. Desert environments are characterized by scarcity of water, so plants have evolved various adaptations to conserve moisture. We need to evaluate each given statement to determine if it contributes to inhibiting water loss.
All three modifications listed are effective strategies employed by desert plants to inhibit water loss in arid conditions.
D) 1, 2 and 3 — All three statements describe valid leaf modifications that help desert plants conserve water. Hard and waxy leaves reduce evaporation, tiny or absent leaves reduce surface area for transpiration, and thorns (modified leaves) also significantly reduce surface area for water loss.
The question asks to identify the process explained by the Z scheme. The Z scheme is a fundamental concept in photosynthesis, describing the path of electron flow during the light-dependent reactions.
Correct Option: B) Electron transport. The Z scheme explicitly details the path and carriers involved in the transport of electrons from water to NADP\(^+\) during the light-dependent reactions of photosynthesis.