The question asks about the essential components required by green plants to synthesize organic compounds through photosynthesis. Photosynthesis is a fundamental biological process, and understanding its inputs is key.
C) Light energy and CO₂ — This option correctly identifies both the energy source (light energy) and one of the primary raw materials (carbon dioxide) essential for photosynthesis. Green plants absorb light energy using chlorophyll and take in carbon dioxide from the atmosphere to produce glucose and oxygen.
The question asks to identify the primary site of photosynthesis in higher plants. This requires knowledge of the cell organelles and their specific functions.
Correct Option: C) Chloroplast is the primary site of photosynthesis in higher plants. These organelles contain chlorophyll, the green pigment essential for absorbing light energy, and house all the necessary enzymes and structures for both the light-dependent and light-independent reactions of photosynthesis.
The question asks to identify the primary photosynthetic pigment. Photosynthesis is the process by which plants convert light energy into chemical energy. This process relies on various pigments, but one plays a central and indispensable role.
Correct Option: D) Chlorophyll a is universally recognized as the primary photosynthetic pigment because it directly participates in the light-dependent reactions by absorbing light energy and initiating the electron flow, leading to the production of ATP and NADPH.
This question tests knowledge about the different types of chlorophyll and their characteristic colors. Chlorophylls are pigments essential for photosynthesis, and each type absorbs and reflects light differently, resulting in distinct colors.
Correct Option: A) Blue-green
Chlorophyll a is the main photosynthetic pigment in plants and algae, and it appears blue-green due to its specific light absorption and reflection properties.
The question asks about the primary absorption spectrum of carotenoids, which are accessory photosynthetic pigments. To answer this, we need to recall the role of different photosynthetic pigments and the wavelengths of light they absorb.
D) Blue and violet wavelengths — Carotenoids are known to absorb light most effectively in the blue and violet parts of the visible spectrum. This allows them to capture light energy that chlorophylls might miss, thus expanding the range of light available for photosynthesis.
The question asks about Joseph Priestley's discovery in 1770 regarding plants. This refers to his famous experiments that laid the groundwork for understanding photosynthesis and the role of plants in gas exchange.
Correct Option: B) Restore oxygen to air that has been 'damaged' by burning or breathing
This option accurately describes Joseph Priestley's key finding in 1770. His experiments showed that plants have the ability to replenish the air with a substance (later identified as oxygen) that is consumed during combustion and respiration.