Absorption, Transport & Water Loss (Transpiration) in Plants : 12th Class Biology Q Ans Lesson 8 – NIOS
INTEXT QUESTIONS 8.1
- Define diffusion.
Ans. Movement of molecules from their region of higher concentration to theregion of lower concentration. - Give one point of difference between osmosis and diffusion.
Ans. A semipermeable membrane is required for osmosis and not necessarily for diffusion. - Name the process because of which crystals of KMnO4 added to water makesit purple.
Ans. Diffusion - If blood cells are placed in salt water what will happen to them ? Based on youranswer state if salt solution is isotonic, hypotonic or hypertonic?
Ans. Water will move out from the blood cells and they will shrink. - When does plasmolysis occur in plant cells?
Ans. When the cell is placed in a hypertonic solution - Name the phenomenon which makes it difficult to close a wooden door aftermonsoon?
Ans. Imbibition
INTEXT QUESTIONS 8.2
- Which part of the plant absorbs water and minerals?
Ans. Root - What are plasmodesmata?
Ans. Cytoplasmic connections between plant cells - How does translocation occur in plants?
Ans. Through the pholem - What is the process of ascent of sap?
Ans. Movement of water and minerals from roots to leaves, that is from the
ground to tip of plant. - Which are three different forms in which water is present in the soil?
Ans. Gravitational, Hygroscopic and capillary
INTEXT QUESTIONS 8.3
- Name the pressure in guard cells responsible for opening and closing of stomata.
Ans. Turgor pressure - Mention the shape of guard cells in monocots and dicots.
Ans. Dicot : Kidney shaped
Monocots : Dumb bell shaped - Give a point of difference between a stoma and a hydathode
Ans. Stomata – are pores on the leaf surface through which water diffuses asvapour
Hydathodes – special pores in leaf margins through which water is lost
as water droplets.
TERMINAL EXERCISES
- Name two types of passive absorption in plants.
- In what ways diffusion is important to a plant ?
- Name various factors that affect osmosis in plants.
- Differentiate between turgor pressure and wall pressure.
- Discuss the mechanism of stomatal opening in dicot plants.
- Explain any four factors that affect transpiration in plants.
- Describe an experiment to demonstrate osmosis by potato osmometer.
- Discuss the cohesion tension theory for uptake of water in plants.
- Describe the mechanism of translocation of solutes. Name the most appropriate
theory for the translocation of solutes in plants. Who proposed this theory ? - Differentiate between symplast and apoplast pathway of water movement in
plants. - Define transpiration.
- Name the holes in the bark through which transpiration in the bark of old
trees takes place ? - Why is transpiration considered to be a necessary evil ?
- Give one way by which desert plants prevent transpiration.
- State one point of difference between transpiration and guttation.
NIOS 12th class biology Q Ans
- Origin and Evolution of Life & Classification : 12th Class Biology Notes – NIOS
- The Kingdoms Monera, Protista & Fungi : 12th Class Biology Notes – NIOS
- Kingdoms Plantae & Animalia : 12th Class Biology Question Answer Lesson 3 – NIOS
- Cell Structure & Function : 12th Class Biology Question Answer Lesson 4 – NIOS
- Tissues & Others Level of Organization : 12th Class Biology Question Answer Lesson 5 – NIOS
- Root System : 12th Class Biology Question Answer Lesson 6 – NIOS
- Shoot System : 12th Class Biology Question Answer Lesson 7 – NIOS
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