Class 11 Biology - Chapter Biological Classification NCERT Solutions | Diatoms are also called as ‘pearls
Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?
Diatoms are chief procedure of ocean and marine water thus they are known as ‘Pearls of Ocean’.
The cell wall of Diatoms are made of cellulose in which Silica particles are embedded in at various places. Their cell wall have silica in very large quantity, due to this reason cell wall appears hard. Cell wall do not get destroyed after their death, so at the bottom of the sea, accumulation of large deposits of diatoms are formed that forms a siliceous covering is known as “Diatomaceous Earth” or “Diatomite” or “Keiselgurh”.
More Questions From Class 11 Biology - Chapter Biological Classification
- Q:- Describe briefly the four major groups of Protozoa.
- Q:- State two economically important uses of: (a) Heterotrophic bacteria (b) Archaebacteria
- Q:- Discuss how classification systems have undergone several changes over a period of time?
- Q:- What are the characteristic features of Euglenoids?
- Q:- What do the terms phycobiont and mycobiont signify?
- Q:- Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.
- Q:- Give a comparative account of the classes of Kingdom Fungi under the following:
(i) Mode of nutrition
(ii) Mode of reproduction - Q:- Plants are autotrophic. Can you think of some plants that are partially heterotrophic?
- Q:- What is the nature of cell-walls in diatoms?
- Q:-
How are viroids different from viruses?
Popular Questions of Class 11 Biology
- Q:- Why are living organisms classified?
- 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:-
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell. - 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:- What is periderm? How does periderm formation take place in dicot stem?
- Q:- Segmentation in the body is first observed in which of the following:
(a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda - Q:- What are the factors affecting the rate of diffusion?
- Q:- Distinguish between
(a) Simple epithelium and compound epithelium.
(b) Cardiac muscle and striated muscle
(c) Dense regular and dense irregular connective tissues
(d) Adipose and blood tissue
(e) Simple gland and compound gland - Q:- Figure 13.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:
(a) At which point/s (A, B or C) in the curve is light a limiting factor?
(b) What could be the limiting factor/s in region A?
(c) What do C and D represent on the curve?
- Q:- Draw a neat diagram of digestive system of frog.
- Q:- How is respiration regulated?
- Q:- Distinguish between the following
(a) Prostomium and peristomium
(b) Septal nephridium and pharyngeal nephridium - Q:-
Bile juice contains no digestive enzymes, yet it is important for digestion. Why?
- Q:- Mention the function of the following
(a) Ureters in frog
(b) Malpighian tubules
(c) Body wall in earthworm
- All Chapters Of Class 11 Biology
- All Subjects Of Class 11