What are the changes in Biology NCERT 2022 for class 11th and 12th

 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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Changes in NCERT Biology 2022 Book for Class 11th and 12th

 New NCERT

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Changes in NCERT Biology 2022 Book for Class 11th and 12th

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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Changes in NCERT Biology 2022 Book for Class 11th and 12th

 New NCERT 2022 Changes

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Changes in NCERT Biology 2022 Book for Class 11th and 12th

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

Changes in NCERT Biology 2022 Book for Class 11th and 12th


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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Changes in NCERT Biology 2022 Book for Class 11th and 12th

 New NCERT 2022 Changes

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Changes in NCERT Biology 2022 Book for Class 11th and 12th

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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