NEET aspirants are time and again advised to study biology, physics, chemistry from NCERT books. NEET 2019, AIIMS, JIPMER MBBS Entrance Exams by and large frame questions based on books by the CBSE prescribed organizations. Recently, NCERT biology books have undergone some revisions.
Chandigarh based Dr Arvind Goyal had filed a petition pointing out errors in NCERT class 11 and 12 biology books. Punjab and Haryana High Court had, in view of petition, directed NCERT to look into it. National Council of Educational, Research and Training accepted 11 mistakes as per newspaper report in March 2018.
Dr Arvind Goyal was invited by NCERT to discuss errors in the month of February. NCERT thereupon worked on them, and, in a letter they highlighted accepted errors with correction and marked rest as correct. Revised edition of NCERT has some changes and remaining changes will be incorporated in next edition.
Students who are preparing for NEET 2019 or NEET 2020 want to know how changes in NCERT biology book will impact their preparation for NTA NEET exam. This article will throw light upon changes and their impact.
Changes In NCERT Biology Book
The most authentic source for finding out exact changes in NCERT book is its errata. However, errata is not yet available on official website of council.
Upon searching several places for changes, so that we can tell you about them here, we came across two useful documents. There is one TOI news report dated 23 March 2018 which enlists 7 changes in NCERT class 11 and 12 biology books. Another is a PDF document uploaded by Dr Goyal that has 44 changes.
We are providing both to you here. You can go through both and note down corrections in NCERT books. However if you are already using the new books then you see revisions in it.
Changes in NCERT biology book as per news paper report
NCERT Class 11 Biology Book Changes
|Biomolecules||145||Skeletal structure of cholesterol given in Fig 9.1 is not correct.||Correct figure updated.|
|Mineral Nutrition||202||“Examples of free-living nitrogen-fixing aerobic microbes are Azotobacter and Beijernickia while Rhodospirillum is anaerobic and Bacillus free-living.” This statement seems incomplete. All bacteria in it are free living.||Sentence reframed|
|Structural Organization In Animal||109||Figure 7.11 showing closed circulatory system of earthworm has incorrect labelling for sub-neural vessel. Vessel with label sub-neural vessel is ventral vessel. Sub-neural vessel is one below vessel in figure.||Arrow placed correctly.|
|Cell||127, 128||Page 127 says that size of bacteria is 3-5 μm. Page 128 says size of bacteria is 1-2 μm.||Corrected|
|137||“The axoneme usually has nine pairs of doublets of radially arranged peripheral microtubules” should be “The axoneme usually has nine doublets (and not nine pairs of doublets) of radially arranged peripheral microtubules”||Corrected|
NCERT Class 12 Biology Book Changes
|Environmental Issues||273||Table 16.1 indicates mass emission standards in India. in light of SC implementation of BS IV norms from 1 Apr 2017, this needs updation.||Concern considered.|
|284||“By the end of the century, forest cover shrunk to 19.4%.” Ministry of Environment and Forest Report 2015 shows that total forest cover has increased 24.16%||Information was as per details available at time of writing book. Issue considered.|
Changes in NCERT biology book as per PDF uploaded by Dr Arvind Goyal
NCERT Class 11 Biology Book Changes
|The Living World||4||unicellular organisms grow by cell division.||Unicellular organisms multiply by cell division.|
|Fungi||24||Many members like morels and buffles are edible.||Many members like morels and truffles are edible.|
|Plant Morphology||79||In the family Fabaceae, the floral diagram shows valvate aestivation of Calyx, while in the theory it is mentioned that Calyx has imbricate aestivation||Calyx in Fabaceaea has Valvate / Imbricate aestivation. Since diagram is specifically of Pisum sativum so valvate shown in that.|
|Plant Morphology||81||Fabaceae floral diagram shows perianth to be gamophyllous, theory says perianth – tepal six ( 3+3), often unified into tube. Wheeras floral formula shows perianth to be polyphyllous. Also androecium floral diagram shows stamens to be free and epiphyllous (united to tepals). Wheeras in floral formula they are shown as A3+3 meaning to be free and not attached to perianth. Theory indicates Androecium is stamen six, (3+3), which also means they are fused.||Floral formula corrected to P(3+3) ; Androceium is 3+3 and in floral diagram corrected to 3+3 and made Epitepalous|
|Animal Morphology||108||Typhlosole extends between 26 – 35 segments in the intestine of Earthworm||Typhlosolar region lies after 26th segment except the last 23rd -25th segments .|
|110||Labelling of spermiducal funnels and testis is wrong.||Corrected|
|115, 121||female cockroach produces 9 – 10 ootheca. However summary at pg 121 says female cockroach produces 10 – 40 ootheca.||Now both text says female cockroach produces 9 – 10 ootheca.|
|110||Fig 7.13 prostate gland in earthworm has been shown to be lying in 17th to 19th segments.||Now shown to be lying in 17th to 20th segments|
|114, 121||Ovaries in cockroach are present in 2 nd to 6th abdominal segments. Whereas pg. no. 121 says it is mentioned that ovaries in cockroach are present in 4th, 5th and 6th abdominal segments.||Now both texts say Ovaries in cockroach are present in 2nd to 6th abdominal segments.|
|114, 121||Testes in cockroach are present in 4 th to 6th abdominal segments. Whereas pg. no. 121 says it is mentioned that testes in cockroach are present in 4th, 5th abdominal segments.||Now both texts say Testes in cockroach are present in 4th to 6th abdominal segments.|
|Cell||136||Size of chloroplast – length – 5 – 10mm and widt – 2 – 4mm||Size of chloroplast – length – 5 – 10mm and widt – 2 – 4mm|
|127-128||All prokaryotes have a cell wall surrounding the cell membrane. Whereas pg no. 20 says Mycoplasma are organisms that completely lack a cell wall. As Mycoplasma are prokaryotic organisms kept under Monera by NCERT itself, the fact given on pg No. 127-128 should be rectified.||All prokaryotes have a cell wall surrounding the cell membrane except in mycoplasma.|
|149||Exoskeletons of arthropods have a complex polysaccharide called chitin. These complex polysaccharides are heteropolymers.||Homopolymers|
|150||:Structure of glutamic acid||Extra-CH2 group deleted, and so Glutamic acid is C5H9NO4|
|160, 147||Pg 160 – There are 21 types of amino acids
Pg 147 – There are 20 types of amino acids
|There are 20 types of amino acids|
|Plant Physiology||198||Pg 198 – Deficiency symptoms of relatively immobile elements appear first in young leaves – e.g.,Sulphur& calcium
Pg 190 – Elements most readily mobilized are phosphorus, sulphur, nitrogen and potassium. Some elements that are structural components like calcium are not remobilized.
|Sulphur is mobile and Calcium is an immobile element , at both places in the book.|
|Digestion And Absorption||259||Duodenum is ‘u’ shaped||Duodenum is ‘c’ shaped|
|264||Fructose is absorbed with the help of the carrier ions like Na+ .||Substances are absorbed with the help of the carrier ions like Na+ .They have deleted the statement that Fructose is absorbed with the help of the carrier ions like Na+ .|
|Body Fluids And Circulation||283||Heart diagram – pulmonary vein is actually pulmonary trunk (pulmonary artery).||Corrected|
|Excretory System||298||Our lungs remove large amounts of CO2(18 litres/day)||Our lungs remove large amounts of CO2(approximately 200 mL/ minute)|
|294||Reabsorption is minimum in Henle’s loop||Reabsorption is minimum in its ascending limb.|
|Neural Control And Coordination||325||There are wax secreting sebaceous glands in the skin of the pinna and the meatus.||There are wax secreting glands in the skin of the pinna and the meatus.|
NCERT Class 12 Biology Book Changes
|Reproduction In Organisms||164||Pg 13 – Haploid chromosome number (n) in Onion is given as 16
Pg 164 – onion cells have 14 chromosomes.
|Haploid chromosome number (n) in Onion is 8 and Diploid is 16.|
|5||Pg 5 – when offspring is produced by a single parent with or without the involvement of gamete formation, the reproduction is asexual.
Pg 15 – Asexual reproduction does not involve the formation or fusion of gametes.
|Asexual reproduction does not involve the fusion of gametes.|
|Sexual Reproduction In Flowering Plants||25||ovule generally has a single embryo sac formed from a megaspore through reduction division.||ovule generally has a single embryo sac formed from a megaspore.|
|Human Reproduction||54||End of 24 weeks is termed as second trimester||By end of about approximately 24 weeks ( end of second trimester).|
|Principles Of Inheritance And Variations||70||one of the contrasting traits selected in pea plants by Mendel was smooth or inflated pods.||one of the contrasting traits selected in pea plants by Mendel was constricted or inflated pods|
|Molecular Basis Of Inheritance||105||Pg 105 – E.coli divides in 20 minutes
Pg 106 – E.coli completes the process of DNA replication within 38 minutes.
|Pg 105 – E.coli divides in 20 minutes
Pg 106 – E.coli completes the process of DNA replication within 18 minutes.
|112||Short name of Glutamine is given as Gin||Short name of Glutamine is Gln|
|Human Health And Disease||162||AIDS can be transmitted to one’s life partner through sexual contact while hepatitis B is transmitted through infected blood||Both can be transmitted through sexual contact or infected blood.|
|159||Drugs like barbiturates, amphetamines, benzodiazepines, lysergic acid diethyl amides (LSD), and other similar drugs, that are normally used as medicines to help patients cope with mental illnesses like depression and insomnia, are often abused.||LSD deleted|
|Strategies For Enhancement In Food Production||177||Under Tissue Culture somatic hybridisation between protoplasm of tomato and potato resulted in formation of tomato||Tissue culture somatic hybridisation between protoplasm of tomato and potato resulted in formation of pomato|
|Biotechnology Principles And Processes||195||The convention for naming the restriction enzymes is the first letter of the name comes from the genes and the second two from the species.||Genus instead of genes|
|Biotechnology And Applications||211||Fig 12.3 – olour of A peptide should be blue and that of the B peptide should be green after being separated from the ‘C’ peptide.||Correction in colors done.|
|Organisms And Populations||222||>100 percent Salinity of hypersaline lagoons||> 100 parts per thousand|
|245||Chemosynthetic bacteria have been called autotrophs which fix sun’s energy.||Deleted|
|251||In primary succession of water, pioneers are the small phytoplanktons, they are replaced by free floating angiosperms, then by rooted hydrophytes, sedges, grasses and finally the trees.||In primary succession in water, the pioneers are the small phytoplanktons, they are replaced with time by rooted-submerged plants, rooted-floating angiosperms followed by free-floating plants, then reed-swamp, marsh-meadow, scrub and finally the trees. The climax again wouldbe a forest.|
|253||Feg 14.6 – Wrong arrow direction in carbon cycle from burning forests and fuelwood||Corrected|
|Environmental Issues||276||Text – levels of DDT in water are given in units – parts per billion (0.003 ppb)
Image – units – parts per million (0.003 ppm)
|Diagram corrected to parts per billion (0.003 ppb).|
|273||Euro II norms data does not match with data available on internet||According to Euro III Norms, the amount of Sulphur is to be controlled at 350 parts per million in diesel and at 150 ppm in petrol.|
Impact of NCERT Textbook Change In NEET 2019/2020
Changes in NCERT mean that new versions have correct information. So those who have initially studied from an old NCERT can go through new versions and new NCERT solutions. It is important to learn correct facts.
By and large there is no impact on NEET 2019 or NEET 2020. Syllabus of NEET exam shall remain same as before (check here). Candidates should study all topics that are in official NEET exam syllabus.
Qs. Should I study from old NCERTs or new NCERTs?
Ans. Since new NCERTs have corrections, so it is advisable to refer them. However even if you have already studied from old NCERT, do not panic. You can go through new version once and revise changes.
Qs. Will this impact NEET 2019 or NEET 2020?
Ans. No, there will not be any impact on NEET exam. Syllabus shall remain same. Topics from which there will be questions in NTA NEET 2019 shall be same.
If you have any queries about Changes In NCERT Biology Book and Their Impact On NEET 2019/2020, please ask in comments below.