A plant cell is placed in a solution and it shrinks from water loss. In what type of environment was the cell placed?
Hypertonic.
Plasmolytic.
Hypotonic.
Isosmotic.
Correct Answer : A
When a plant cell is placed in a hypertonic solution, the solution outside the cell has a higher solute concentration than the cytoplasm inside the cell. As a result, water molecules move out of the cell by osmosis, causing the cell to shrink or shrivel due to loss of turgor pressure. In a hypertonic environment, the osmotic pressure of the solution exceeds that of the cytoplasm, leading to a net movement of water molecules from inside the cell to the surrounding solution. This results in dehydration of the cell and a decrease in cell volume. Plant cells rely on turgor pressure, generated by the influx of water into the cell, to maintain their structural integrity and support. When placed in a hypertonic environment, the loss of water causes the cell membrane to detach from the cell wall, leading to wilting and potential damage to the cell. Therefore, a plant cell that shrinks from water loss when placed in a solution is experiencing a hypertonic environment.
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Correct Answer is D
Explanation
Prokaryotic cells are characterized by the absence of a true nucleus. In these cells, the genetic material, usually a single circular chromosome, is not enclosed within a membrane-bound nucleus. Instead, the DNA is found in a region of the cytoplasm called the nucleoid. While prokaryotic cells lack many of the membrane-bound organelles found in eukaryotic cells, they contain other structures such as ribosomes, cell walls (in bacteria), and flagella. Prokaryotic cells are typically smaller and simpler in structure compared to eukaryotic cells and are found in organisms belonging to the domains Bacteria and Archaea. These cells are highly adaptable and are found in a wide range of environments, from deep-sea vents to human intestines. Prokaryotic cells play essential roles in various ecological processes, including nutrient cycling, symbiotic relationships, and human health.
Correct Answer is A
Explanation
Animal cells are eukaryotic cells, characterized by the presence of a true nucleus enclosed within a membrane-bound nuclear envelope. Eukaryotic cells also contain other membrane-bound organelles, such as mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and peroxisomes, which perform specialized functions within the cell. These organelles compartmentalize cellular processes, allowing for greater efficiency and specialization of cellular functions. Eukaryotic cells are typically larger and more structurally complex than prokaryotic cells, which lack a true nucleus and membrane-bound organelles. Animal cells are found in organisms belonging to the kingdom Animalia and are essential building blocks of tissues and organs in multicellular animals. They play diverse roles in processes such as metabolism, growth, reproduction, and cellular communication.
Correct Answer is C
Explanation
Osmosis is the passive movement of water molecules across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration, driven by the osmotic pressure gradient. In osmosis, water molecules move freely through the membrane, while solute particles (e.g., ions, sugars) are restricted by the membrane's selective permeability. The direction and rate of osmosis are determined by the relative concentrations of solute molecules on either side of the membrane. Water molecules diffuse across the membrane from the side with lower solute concentration (hypotonic solution) to the side with higher solute concentration (hypertonic solution) until equilibrium is reached. Osmosis plays a critical role in maintaining osmotic balance and regulating water movement in biological systems. It is essential for cell volume regulation, osmoregulation in multicellular organisms, and the absorption of water and nutrients in plants and animals. Osmosis also influences processes such as urine concentration in the kidneys, root water uptake in plants, and the preservation of food through dehydration.
Correct Answer is C
Explanation
In the taxonomic hierarchy, the family represents a higher-level grouping that includes related genera. In the classification provided, Elephantidae represents the family, encompassing all elephants. The specific epithet "indicus" refers to the Indian elephant, which is a subspecies of the Asian elephant.
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