Absorption By Roots Class 10 ICSE MCQ Quiz With Answers

Centriole is not found in a plant cell. Centrioles are small, cylindrical structures that are typically found in animal cells and are involved in cell division. They play a crucial role in organizing the microtubules during cell division, forming the spindle apparatus. Plant cells do not have centrioles, instead, they rely on other structures like the microtubule organizing centers to perform similar functions during cell division.

When the onion epidermal cells are soaked in a 20% salt solution, they lose water and become plasmolyzed, resulting in a shrunken appearance. To return the cells back to their turgid state, they need to be transferred to a solution with a lower salt concentration. The 5% salt solution is the best option because it has a lower salt concentration compared to the 20% salt solution. This lower concentration will cause water to move into the cells by osmosis, resulting in the cells becoming turgid again.

Both red blood cells and root hair cells have a high surface area to volume ratio. This means that they have a large surface area relative to their volume, which is beneficial for their specific functions. In the case of red blood cells, the high surface area allows for efficient exchange of oxygen and carbon dioxide. In root hair cells, the high surface area increases the absorption of water and nutrients from the soil.

The structures that are present only in a plant cell are I, II, and IV. Structure I refers to the cell wall, which is a rigid layer surrounding the plant cell and providing support and protection. Structure II refers to the chloroplasts, which are responsible for photosynthesis in plant cells. Structure IV refers to the large central vacuole, which plays a role in maintaining cell turgidity and storing water and nutrients. These structures are unique to plant cells and are not found in animal cells.

The spiral structure X in the xylem vessel is responsible for the transport of water and nutrients from the roots to the rest of the plant. It helps in maintaining a continuous flow of fluids throughout the plant by providing support and preventing the collapse of the vessel. This spiral structure aids in the efficient movement of water and nutrients, ensuring that they reach all parts of the plant for various physiological processes.

The liquid level in the thistle funnel increased after an hour, indicating that water moved from the beaker to the thistle funnel through osmosis. Osmosis is the movement of water from an area of lower solute concentration to an area of higher solute concentration through a semi-permeable membrane. Therefore, the thistle funnel must have had a lower solute concentration than the beaker, which means it contained distilled water. The beaker, on the other hand, must have had a higher solute concentration, so it contained a solution with 5% sucrose.

Long protoplasmic extensions, also known as root hairs, help root hair cells to take up water. These extensions increase the surface area of the root hair cells, allowing for more efficient absorption of water and nutrients from the soil. The long protoplasmic extensions have thin cell walls, which further facilitate the movement of water into the root hair cells. The vacuole, thick cell wall, and contractile fibers do not directly aid in the uptake of water by root hair cells.

Active transport is a process that requires energy to move molecules or ions against their concentration gradient, from an area of lower concentration to an area of higher concentration. The presence of mitochondria is necessary because they are the powerhouse of the cell, producing ATP which provides the energy needed for active transport. The presence of a concentration gradient is also necessary as it provides the driving force for the movement of molecules or ions. Therefore, the correct answer is the presence of mitochondria and concentration gradient.

Both plant and animal cells have partially permeable membranes, meaning that they allow certain substances to pass through while restricting others. Both types of cells also depend on osmosis for water, as they regulate water balance through the movement of water across their membranes. Additionally, both plant and animal cells can contain food reserves, such as starch in plants and glycogen in animals. However, the statement that both plant and animal cells can expand and burst in water is not true. Plant cells have a rigid cell wall that provides support and prevents them from bursting, while animal cells do not have a cell wall but have a flexible cell membrane that allows them to withstand changes in volume without bursting.

Cytoplasm is present in both plant and animal cells and is the substance that fills the cell, holding the organelles in place and allowing various cellular processes to occur.

The process that caused the water in the beaker to turn red is diffusion. Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. In this case, the red substance in the tubing diffused into the water in the beaker, causing it to turn red.

The correct answer is A because when a strip of potato is placed in distilled water, it will undergo osmosis. Osmosis is the movement of water molecules from an area of higher water concentration to an area of lower water concentration through a semi-permeable membrane. In this case, the potato strip acts as the semi-permeable membrane. As a result, water will enter the potato cells, causing them to swell and increase in length. This increase in length is reflected in the graph, which shows a gradual increase in the length of the potato strip over time.

The chloroplast is an organelle found in plant cells, where light energy is trapped and converted into chemical energy through the process of photosynthesis. It contains chlorophyll, which is responsible for capturing the light energy. The chloroplast is indeed a double-membrane organelle, with an outer membrane and an inner membrane. However, it is not located in the nucleus but in the cytoplasm of the cell. Additionally, while glucose is produced during photosynthesis, it is not specified that a large amount of glucose is produced.