Bio 1 cell biology

• What is osmosis?


  Osmosis is the diffusion of water molecules from a region of higher water concentration to a region of lower water concentration.
• How does osmosis relate to diffusion?

  Osmosis is a special case of diffusion specifically involving water molecules.
• What happens to water molecules during osmosis?

  Water molecules naturally pass through a semi-permeable membrane during osmosis.
• What is the effect of a higher concentration of solute on water movement?

  Water moves from an area of lower solute concentration to an area of higher solute concentration.
• What is the process of osmosis in relation to sugar solutions and plant tissues?

  • Place potato cylinders in different sugar solutions.
  • Measure the mass before and after immersion.
  • Observe changes in mass due to water movement.
  • Higher sugar concentration leads to water loss from potato.
• How can you demonstrate the effect of sugar solutions on plant tissue?

  You can place potato cylinders in various sugar solutions and measure the mass changes after 24 hours.
• What should you do before placing potato cylinders in sugar solutions?

  You should measure the mass of the potato cylinders.
• What is the dependent variable in the experiment with potato cylinders and sugar solutions?

  The dependent variable is the change in mass of the potato cylinders.
• What must be kept constant in the osmosis experiment to ensure fairness?

  All other variables such as volume of solution, temperature, and type of sugar must be kept the same.
• What errors might occur during the osmosis experiment with potato cylinders?

  Errors may arise if potato cylinders are not fully dried or if water evaporates from the beakers.
• How can you reduce the effect of errors in the osmosis experiment?

  You can repeat the experiment and calculate the mean percentage change at each concentration.
• What is the main takeaway about osmosis from the study material?

  Osmosis is simply the diffusion of water molecules.
• What happens to a piece of potato added to a concentrated salt solution?

  The mass of the potato will decrease as water moves out of the potato into the salt solution.
• What are the key concepts related to active transport in cells?

  • Active transport moves substances against their concentration gradient.
  • It requires energy, usually from ATP.
  • It is essential for nutrient uptake and waste removal.
• What is the role of root hairs in plants?

  Root hairs increase the surface area for water and nutrient absorption.
• Why is it important to understand osmosis in the context of cell biology?

  Understanding osmosis is crucial for comprehending how cells maintain homeostasis and manage nutrient uptake.
• How does osmosis contribute to the overall health of a plant?

  Osmosis helps maintain turgor pressure, which is essential for plant structure and growth.
• What is the significance of the concentration gradient in osmosis?

  The concentration gradient drives the movement of water molecules during osmosis.