Class 11 Biology - Chapter Cell: The Unit of Life NCERT Solutions | How do neutral solutes move across the p
How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?
Plasma membrane is the outermost covering of the cell and regulates the movement of substances into the cell and out from it. It allows the entry of only some substances and prevents the movement of other materials. Hence, the membrane is selectively-permeable.
Movement of neutral solutes across the cell membrane – Neutral molecules move across the plasma membrane by simple passive diffusion. Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.
Movement of polar molecules across the cell membrane – The cell membrane is made up of a phospholipid bilayer and proteins. The movement of polar molecules across the non-polar lipid bilayer requires carrier-proteins. Which are integral protein particles having certain affinity for specific solutes. As a result, they facilitate the transport of molecules across the membrane.
More Questions From Class 11 Biology - Chapter Cell: The Unit of Life
- Q:-
Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.
- Q:-
Multicellular organisms have division of labour. Explain.
- Q:-
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
- Q:-
Cell is the basic unit of life. Discuss in brief.
- Q:-
What is a mesosome in a prokaryotic cell? Mention the functions that it performs.
- Q:-
Which of the following is correct:
(a) Cells of all living organisms have a nucleus.
(b) Both animal and plant cells have a well defined cell wall.
(c) In prokaryotes, there are no membrane bound organelles.
(d) Cells are formed de novo from abiotic materials. - Q:-
Both lysosomes and vacuoles are endomembrane structures, yet they differ in terms of their functions. Comment.
- Q:-
Describe the structure of the following with the help of labelled diagrams.
(i) Nucleus
(ii) Centrosome - Q:-
What are nuclear pores? State their function.
- Q:-
What are the characteristics of prokaryotic cells?
Popular Questions of Class 11 Biology
- Q:- Why are living organisms classified?
- Q:- Discuss how classification systems have undergone several changes over a period of time?
- Q:- What is the basis of classification of algae?
- Q:- What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
- Q:- What is meant by modification of root? What type of modification of root is found in the (a) Banyan tree (b) Turnip (c) Mangrove trees
- Q:- State the location and function of different types of meristem.
- Q:- Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworm? (iii) What is the position of ovaries in the cockroach? (iv) How many segments are present in the abdomen of cockroach? (v) Where do you find malphigian tubules?
- Q:- What are macromolecules? Give examples.
- Q:- What is the average cell cycle span for a mammalian cell?
- Q:- What are the factors affecting the rate of diffusion?
Recently Viewed Questions of Class 11 Biology
- Q:- Describe the evolutionary change in the pattern of heart among the vertebrates.
- Q:- Differentiate between the following:-
(i)red algae and brown algae
(ii) liverworts and moss
(iii) homosporous and heterosporous pteridophyte
(iv) syngamy and triple fusion - Q:- What is the difference between direct and indirect development?
- Q:- Match the following:
(a) Operculum (i) Ctenophora
(b) Parapodia (ii) Mollusca
(c) Scales (iii) Porifera
(d) Comb plates (iv) Reptilia
(e) Radula (v) Annelida
(f) Hairs (vi) Cyclostomata and Chondrichthyes
(g) Choanocytes (vii) Mammalia
(h) Gill slits (viii) Osteichthyes - Q:- How are the minerals absorbed by the plants?
- Q:- What are the different types of movements exhibited by the cells of human body?
- Q:- Differentiate between
(a) Racemose and cymose inflorescence
(b) Fibrous roots and adventitious roots
(c) Apocarpous and syncarpous ovary - Q:-
Define a taxon. Give some examples of taxa at different hierarchical levels.
- Q:- List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.
- Q:-
Bile juice contains no digestive enzymes, yet it is important for digestion. Why?
10 Comment(s) on this Question
Thanku it is very useful Anshu
Thnkue
Thankyou for helping me
Yaah helpful, saved me...
A helpful site
Nice question and useful also
good Q
Liked it
Good question
It\'s very necessary....and useful also
- All Chapters Of Class 11 Biology
- All Subjects Of Class 11