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Bt. Recombinant DNA technology (rDNA) is a technique used for manipulating the genetic material of an organism to obtain the desired result. They maintain a constant body temperature. When the inactive toxin protein is ingested by the insect, it gets activated by the alkaline pH of the gut. Fishes, amphibians, and reptiles are ectothermal animals. They bear thick cuticles and sunken stomata on the surface of their leaves to reduce transpiration. Recombinant DNA technology (rDNA) is a technique used for manipulating the genetic material of an organism to obtain the desired result. What are transgenic bacteria? 1. Gene therapy is a technique for correcting a defective gene through gene manipulation. Why or why not? How do you describe this interaction between the orchid and the mango tree? This results in the lysis of epithelial cell and eventually the death of the insect. Predation is a biological interaction between the predator and the prey, whereby the predator feeds on the prey. For example, golden rice is a transgenic variety in rice, which is rich in vitamin A. e.g. However, this variety of rice has faced a significant opposition from environment activists. NCERT Solutions for Class 12 Science Biology Chapter 12 Biotechnology And Its Applications are provided here with simple step-by-step explanations. It could be a permanent cure of ADA deficiency. Question6. Thus, major problem to be encountered is the action of digestive enzymes. List any three important characteristics of a population and explain. The production of genetically modified (GM) or transgenic plants has several advantages. Correlate the applications with the current scenario. Hibernation or winter sleep is a resting stage where in animals escape winters (cold) by hiding themselves in their shelters. Phenotypic adaptation involves changes in the body of an organism in response to genetic mutation or certain environmental changes. also. are well adapted to their habitat. Name an organism that produces it. Question10. A population can be defined as a group of individuals of the same species, residing in a particular geographical area at a particular time and functioning as a unit. In some children ADA deficiency can be cured by bone marrow transplantation. These responsive adjustments occur in an organism in order to cope with environmental conditions present in their natural habitats. (In some plants, the margins of their leaves are spiny or have sharp edges that prevent herbivores from feeding on them. Also, animals found in Polar regions have thick layers of fat below their skin and thick coats of fur to prevent the loss of heat. Since beta-carotene is a precursor of pro-vitamin A, it is introduced into the rice variety to fulfill the shortage of dietary vitamin A. Archaebacteria (Thermophiles) are ancient forms of bacteria found in hot water springs and deep sea hydrothermal vents. Question10. Animals also undergo adaptations to suit their natural habitats. For example, desert plants have thick cuticles and sunken stomata on the surface of their leaves to prevent transpiration. Get access to NCERT Solutions for Class 12 Biology Chapter 11 – Biotechnology: Principles and Processes. Water enters their body due to the hypotonic environment outside. NCERT Solutions for Class 12 Biology NCERT Solutions for class-12 Biology Chapter-12 Biotechnology And Its Applications is prepared by entrancei senior teacher team, primary focus while solving these questions of class-12 in NCERT textbook, Do read theory of this Chapter while going before solving the NCERT questions. It has the ability to concentrate its urine to conserve water. CLEAR EXAM has taken up the baton to provide the students with the solutions of all the chapters of NCERT Class 12th Biology book. The first step involves the extraction of lymphocyte from the patient’s bone marrow. What Policies Can Help Students Affected by COVID-19? Since beta-carotene is a precursor of provitamin A, it is introduced into the rice variety to fulfil the shortage of dietary vitamin A. Question9. Consult internet and find out how to make orally active protein pharmaceutical. Question18. Also, genetically modified crops are affecting human health. Cry proteins are encoded by cry genes. Certain endotherms (warm-blooded animals) such as birds and mammals escape cold and hot weather conditions by hibernating during winters and aestivating during summers. Cry Protein: The insecticidal protein which is produced by Bacillus thuringiensis. This is because beta-carotene pigment helps in the process of photosynthesis while photosynthesis does not occur in endosperm. Similar burrowing strategy is seen in other desert animals. Solution : They are highly resistant to unfavourable abiotic conditions. These proteins are toxins, which are produced by Bacillus thuringiensis bacteria. They escape the winter season by entering a state of inactivity by slowing their metabolism. Similar burrowing strategies are exhibited by other desert animals. These variations in temperature affect the distribution of animals on the Earth. However, the oral administration of these peptides or proteins has some problems related to it. The logistic population growth curve is commonly observed in yeast cells that are grown under laboratory conditions. toxin protein exists as inactive pro-toxins, but once an insect ingest this inactive toxin, it is converted into active form of toxin due to the alkaline pH of the gut which solubilize the crystal. Solution : This results in the lysis of epithelial cell and eventually the death of the insect. But, there are certain controversies regarding the use of genetically modified crops around the world. However, as the temperature begins to rise, the lizard burrows itself inside the sand to escape the scorching sun. This is because beta-carotene pigment helps in the process of photosynthesis while photosynthesis does not occur in endosperm. Water scarcity is another factor that forces animals to undergo certain adaptations to suit their natural habitat. Also, they can cause genetic pollution in the wild relatives of the crop plants. Bears and squirrels inhabiting cold regions are examples of animals that hibernate during winters. Therefore, the relationship between a mango tree and an orchid is an example of commensalisms, where one species gets benefited while the other remains unaffected. Cry Gene: The Bt toxins are coded by a gene named Cry. The rice plant naturally produces betacarotene pigment in its leaves. These adaptations present in the behaviour of an organism to escape environmental stresses are called behavioural adaptations. The rice plant naturally produces beta-carotene pigment in its leaves. Solution : all rights reserved. Biotechnology essentially deals with industrial scale production of biopharmaceuticals and biologicals. It has to be made digestible for the digestive system and also protect it from the degradation of HCl present in stomach so it is coated by a film that is resistant to protein degrading enzymes. Average temperature on the Earth varies from one place to another. Using rDNA, one can obtain oilless seeds by preventing the synthesis of either glycerol or fatty acids. It involves silencing of a specific mRNA due to complementary double stranded RNA. Question8. Free PDF download of NCERT Solutions for Class 12 Biology Chapter 12 - Biotechnology and its Applications solved by Expert Teachers as per NCERT (CBSE) textbook guidelines. (d) bacteria encloses toxin in a special sac. These ncert book chapter wise questions and answers are very helpful for CBSE board exam. Class 12 Biology Biotechnology and its Applications – Get here the Notes for Class 12 Biotechnology and its Applications. Substituting these values in the formula, we get: Hence, the intrinsic rate of increase for the above illustrated population is 0.2311. The kangaroo rat found in the deserts of Arizona never drinks water in its life. These treated lymphocytes containing ADA gene are then introduced into the patient’s bone marrow. Bt. Distinguish between the following: Solution : Their temperature varies with their surroundings. It involves the delivery of a normal gene into the individual to replace the defective gene, for example, the introduction of gene for adenosine deaminase (ADA) in ADA deficient individual.

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