Which element is essential for the synthesis of chlorophyll and is often taken up as a divalent cation?
Calcium
Potassium
Magnesium
Iron
Related Questions
The process by which plants accumulate mineral ions against their concentration gradient, requiring energy, is called:
Passive transport
Diffusion
Osmosis
Active transport
Certain plant species can thrive in soils with high concentrations of heavy metals like nickel. These plants often exhibit modified transport proteins. How might these modified proteins contribute to heavy metal tolerance?
By increasing the influx of nickel into the cytoplasm
By facilitating the efflux of essential nutrients to compensate for nickel toxicity
By converting nickel into less toxic forms
By sequestering nickel into vacuoles, reducing its cytoplasmic concentration
Mycorrhizae aid in mineral uptake primarily by increasing the:
Rate of photosynthesis
Rate of transpiration
Surface area for absorption
Concentration of minerals in the soil
Which of the following processes requires energy to transport ions from a region of lower concentration to a region of higher concentration across a membrane?
Simple diffusion
Facilitated diffusion
Osmosis
Active transport
The movement of ions against their concentration gradient across a cell membrane is achieved through:
Diffusion
Osmosis
Facilitated diffusion
Active transport
Which of the following is a micronutrient required for nitrogen fixation in legumes?
Magnesium
Calcium
Molybdenum
Potassium
Iron deficiency in plants often leads to interveinal chlorosis. This is primarily due to the role of iron in:
Cell wall formation
Stomatal regulation
Synthesis of chlorophyll
Potassium uptake
The initial uptake of mineral ions by root hairs is primarily through:
Active transport
Diffusion
Osmosis
Bulk flow
Which of the following is NOT a factor affecting the uptake of mineral ions by plants?
Soil pH
Concentration of mineral ions in the soil
Presence of chlorophyll
Root hair density
Which of the following is NOT a mechanism by which mycorrhizae enhance mineral uptake in plants?
Increasing the surface area for absorption
Producing chelating agents that solubilize minerals
Directly converting atmospheric nitrogen into usable forms for the plant
Improving the plant's access to phosphorus
