Q. 95.0( 1 Vote )
Name the phenomenon which helps fresh water unicellular organisms (e.g. Amoeba) continuously gain water in their bodies. Also, name the mechanisms by which these organisms throw out excess of water from their bodies.
(b) Give at least two examples in plants where similar phenomenon in used to gain water.
1. Osmosis helps fresh water unicellular organisms (Amoeba) to gain water in their bodies. 2. Contractile vacuole helps in osmoregulation. It throws out excess of water from their bodies.
(b) (i) Absorption of water by the plant root hairs occurs due to osmosis.
(ii) In plants, cells, tissues and soft organs such as leaves, buds, young shoots, flowers, fruits maintain turgidity due to osmotic absorption of water.
Rate this question :
Why does the skin of your fingers shrink when you wash clothes for a long time?Dr. P.S. Verma & Dr. V.K. Agarwal - Biology
How are chromatin, chromatid and chromosome related to each other.Dr. P.S. Verma & Dr. V.K. Agarwal - Biology
What is the gene? Give its functions.Together with Science
Medical science took a giant step forward when it declared its capability to store stem cells. Stem cells can be used later on to treat certain diseases if need arises. Along with many Western countries. India also has the facility for storage of stem cell and for use of the same for therapy. Scientists’ are trying their best to maximize the benefit from storage of stem cells.
(i) What is the main source of stem cells?
(ii) What are the diseases that can be treated by storing stem cells?
(iii) What value is shown by the scientists?
Together with Science
Which functions are performed by cell wall in plant cells?Together with Science
Which structure of animal cell forms the asters of spindle?Together with Science
Name two factors on which shape of the cell depends.Dr. P.S. Verma & Dr. V.K. Agarwal - Biology
What is endosmosis?Dr. P.S. Verma & Dr. V.K. Agarwal - Biology
Plasma membrane is permeable to water. How does a cell show endosmosis or exosmosis?Dr. P.S. Verma & Dr. V.K. Agarwal - Biology