B. Short answer questions :
1. Define the term osmosis.
2. What is a semipermeable membrane ?
3. What is the importance of water to plants ?
4. How are root hairs adapted for absorbing water from the soil ?
Answers
Answer:
b.1.ans:-a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
b.2.ans:-Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
b.3.ans:-Water is vital for the life and survival of all plants. Water is also essential for the transportation of nutrients and sugars from the soil to the plants. All plants will suffer from water shortage or drought at some point. This can be fatal in some cases or severely slow the growth of those plants.
b.4.ans:-Plants absorb water from the soil by osmosis. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.
Answer:
I) a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.
ii) Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
iii)Water is vital for the life and survival of all plants.
Water is also essential for the transportation of nutrients and sugars from the soil to the plants. All plants will suffer from water shortage or drought at some point. This can be fatal in some cases or severely slow the growth of those plants. Plants suffering from a prolonged drought can be left susceptible to secondary infection by pests and pathogens.
iv) Plant leaves are adapted for photosynthesis and gas exchange. Roots absorb water and mineral ions through root hair cells and are transported up the plant by the xylem......