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Changes in NCERT Biology 2022 Book for Class 11th and 12th – There is always some potensial changes in NCERT Book. In recent latest publication og biology book in 2022, there have been some changes in the book. We have listed down all the changes with their older version. We have also marked the changed text for easy refrence. This is a important information mostly for a NEET aspirant who is seeking for right information. As NTA focuses on NCERT so it’s important to know the changes which have occured.
Below we have listed 20 changes of text or diagrams in Biology NCERT 2022 Book with refrence to the older versions. Please kindly have a look on these points. It’s not wise to buy a new one and go threw all the content for the sake of some minute changes (Not in context with importance but only quantity). So, it’s also advised to mark down the changes in your old book if you are not having a one.
CLASS 11th
Chapter- 2 Biological Classification (Pg. 17)
Old NCERT
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New NCERT
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Chapter- 2 Biological Classification (Pg. 26)
Old NCERT
The name virus that means venom or poisonous fluid was given by Pasteur. D.J. Ivanowsky (1892) recognised certain microbes as causal organism of the mosaic disease of tobacco. These were found to be smaller
New NCERT 2022 Changes
Virus means venom or poisonous fluid. Dmitri IVanowsky (1892) recognised certain microbes as causal organism of the mosaic disease of tobacco (Figure 2.6a). These were found to be smaller than bacteria
Chapter- 4 Animal Kingdom (Pg. 49)
Old NCERT
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New NCERT 2022 Changes
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Chapter- 8 Cell : The unit of life (Pg. 131)
Old NCERT
hydrophobic tails towards the inner part. This ensures that the nonpolar tail of saturated hydrocarbons is protected from the aqueous environment (Figure 8.4). The lipid component of the membrane mainly consists of phosphoglycerides.
New NCERT 2022 Changes
the inner part.This ensures that the nonpolar tail of saturated hydrocarbons is protected from the aqueous environment (Figure 8.4). In addition to phospholipids membrane also contains cholesterol.
Chapter- 8 Cell : The unit of life (Pg. 134)
Old NCERT
In Amoeba the contractile vacuole is important for excretion. In many cells, as in prolists, food vacuoles are formed by engulfing the food particles.
New NCERT 2022 Changes
In Amoeba the contractile vacuole is important for osmoregulation and excretion. In many cells, as in protists, food vacuoles are formed by engulfing the food particles.
Chapter- 8 Cell : The unit of life (Pg. 136)
New NCERT 2022 Changes
Chapter- 8 Cell : The unit of life (Pg. 136)
Old NCERT
An elaborate network of filamentous proteinaceous structures present in the cytoplasm is collectively referred to as the cytoskeleton. The
New NCERT 2022 Changes
An elaborate network of filamentous proteinaceous structures consisting of microtubules, microfilaments and intermediate filaments present in the cytoplasm is collectively referred to as the cytoskeleton. The
Chapter- 8 Cell : The unit of life (Pg. 137)
Old NCERT
The axoneme usually has nine pairs of doublets of radially arranged peripheral microtubules, and a pair of centrally located microtubules.
New NCERT 2022 Changes
The axoneme usually has nine doublets of radially arranged peripheral microtubules, and a pair of centrally located microtubules. Such an
Chapter- 9 Biomolecules (Pg. 153)
Old NCERT
them. For example, the blood concentration of glucose in a normal healthy individual is 4.5-5.0 mM, while that of hormones would be nanograms/mL. The most important fact of biological systems is that all living
New NCERT 2022 Changes
them. For example, the blood concentration of glucose in a normal healthy individual is 4.2 mmol/L—6.1 mmol/L, while that of hormones would be nanograms/mL. The most important fact of biological systems is that
Chapter- 10 Cell Cycle & Cell Division (Pg. 164)
Old NCERT
In animals, mitotic cell division is only seen in the diploid somatic cells. Against this, the plants can show mitotic divisions in both haploid and diploid cells. From your recollection of examples of alternation of
New NCERT 2022 Changes
in, animals, mitotic cell division is only seen in the diploid somatic cells. However, there are few exceptions to this where haploid cells divide by mitosis, for example, male honey bees. Against this, the plants can show mitotic divisions in both haploid and diploid cells. From your
Chapter- 15 Plant growth and development (Pg. 248)
Old NCERT
extract, coconut milk or DNA. Skoog and Miller, later identified and crystallised the cytokinesis promoting active substance that they termed kinetin.
New NCERT 2022 Changes
extract, coconut milk or DNA. Miller et al. (1955), later identified and;crystallised the cytokinesis promoting active substance that they termed kinetin
Chapter- 15 Plant growth and development (Pg. 248)
Old NCERT
Cousins conlirmed the release of a volatile substance from ripened oranges that hastened the ripening of stored unripened bananas. Later this volatile substance was identified as ethylene, a gaseous PGR.
New NCERT 2022 Changes
H.H. Cousins (1910) confirmed the release of a volatile substance from ripened oranges that hastened the ripening of stored unripened bananas. Later this volatile substance was identified as ethylene, a gaseous PGR.
Chapter- 17 Breathing & Exchange of gases (Pg. 273)
Old NCERT
to that of O,. The diffusion membrane is made up of three major layers (Figure 17.4) namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them. However, its total thickness is much
New NCERT 2022 Changes
to that of O,. The diffusion membrane is made up of three major layers (Figure 17.4) namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries) in between them.
Chapter- 17 Breathing & Exchange of gases (Pg. 273)
Old NCERT
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New NCERT 2022 Changes
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Chapter- 21 Neural Control & Coordination (Pg. 321)
Old NCERT
passess through the midbrain. The dorsal portion of the midbrain consists mainly of four round swellings (lobes) called corpora quadrigemina. Midbrain and hindbrain form the brain stem.
New NCERT 2022 Changes
passess through the midbrain. The dorsal portion of the midbrain consists mainly of four round swellings (lobes) called corpora quadrigemina.
Chapter- 21 Neural Control & Coordination (Pg. 321)
Old NCERT
provide the additional space for many more neurons. The medulla of the brain is connected to the spinal cord. The medulla contains centres which control respiration, cardiovascular reflexes and gastric secretions.
New NCERT 2022 Changes
order to provide the additional space for many more neurons. The medulla of the brain is connected to the spinal cord. The medulla contains centres which control respiration, cardiovascular reflexes and gastric secretions.
Three major regions make up the brain stem; mid brain, pons and medulla oblongata. Brain stem forms the connections between the brain and spinal cord.
CLASS 12th
Chapter- 1 Reproduction in organisms (Pg. 5)
Old NCERT
organisations. In Protists and Monerans, the organism or the parent cell divides into two to give rise to new individuals (Figure1.2). Thus, in these organisms cell division is itself a mode of reproduction.
New NCERT 2022 Changes
organisations. In Protists and Monerans, the organism or the parent cell divides by mitosis into two to give rise to new individuals (Figure1.2). Thus, in these organisms cell division is itself a mode of reproduction.
Chapter- 14 Ecosystem (Pg. 248)
Old NCERT
consumer. The three ecological pyramids that are usually studied are (a) pyramid of number; (b) pyramid of biomass and (c) pyramid of energy. For detail (see Figure 14.4 a, b, c and d).
New NCERT 2022 Changes
producers or the first trophic level while the apex represents tertiary or top level consumer. The three types of ecological pyramids that are usually studied are (a) pyramid of number; (b) pyramid of biomass and (c) pyramid of energy. For detail (see Figure 14.4 a, b, c and d).
Chapter- 15 Biodiversity and Conservation (Pg. 259)
Old NCERT
According to the IUCN (2004), the total number of plant and animal species described so far is slightly more than 1.5 million, but we have no clear idea of how many species are yet to be discovered and described. Estimates
New NCERT 2022 Changes
According to the International Union for Conservation of Nature and Natural Resources (IUCN) (2004), the total number of plant and animal species described so far is slightly more than 1.5 million, but we have no
Chapter- 16 Environmental issues (Pg. 284)
Old NCERT
the twentieth century, forests covered about 30 per cent of the land of India. By the end of the century, it shrunk to 19.4 per cent, whereas the National Forest Policy (1988) of India has recommended 33 per cent forest cover for the plains and 67 per cent for the hills.
New NCERT 2022 Changes
the twentieth century, forests cgvered about 30 per cent of the land of India. By the end of the cent shrunk to 21.54 per cent, whereas the National Forest Policy (1988) of India has recommended 33 per cent forest cover for the plains and 67 per cent for the hills.
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