How has man exploited this protein to his benefit? (d) One organism is benefited, other is affected. Vedantu.com - No.1 online tutoring company in India provides you Free PDF download of NCERT Solutions for Class 12 Biology Chapter 12 - Biotechnology and its Applications solved by Expert Teachers as per NCERT (CBSE) Book guidelines. What Policies Can Help Students Affected by COVID-19? A population grows exponentially if sufficient amounts of food resources are available to the individual. It enables the stomata to remain closed during the day to reduce the loss of water through transpiration. In some children ADA deficiency can be cured by bone marrow transplantation. Cry proteins are encoded by cry genes. When the inactive toxin protein is ingested by the insect, it gets activated by the alkaline pH of the gut. The kangaroo rat found in the deserts of Arizona never drinks water in its life. Then, a functional gene for ADA is introduced into lymphocytes with the help of retrovirus. Solution : Solve previous years’ questions to gather an insight into the pattern of questions. It includes five phases: the lag phase, positive acceleration phase, exponential phase, negative acceleration phase, and stationary phase. Also, they can cause genetic pollution in the wild relatives of the crop plants. also. Hence, the predators regulate the population of preys in a habitat, thereby helping in the management of pest insects. Illustrate using the example of adenosine deaminase (ADA) deficiency. 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. are well adapted to stay in their habitat. These adaptations occur in desert animals to prevent the loss of water. The adenosine deaminase enzyme is important for the normal functioning of the immune system. Fishes and snails are examples of organisms aestivating during summers. The individual suffering from this disorder can be cured by transplantation of bone marrow cells. These adaptations in the behaviour of an organism are called behavioural adaptations. 5. NCERT Solutions 2020-21 and Offline Apps are based on latest NCERT Books 2020-21 following the new academic CBSE Curriculum. Certain endotherms (warm-blooded animals) such as birds and mammals escape cold and hot weather conditions by hibernating during winters and aestivating during summers. to protect against temperature variations. Diapause is a stage of suspended development to cope with unfavourable conditions. It is a technique of inserting genes into the cells and tissue of an individual to treat a hereditary disease. This means that they do not have a temperature regulatory mechanism to escape temperature variations. 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. However, it is absent in the endosperm of the seed. Solution : Give one example. Lymphocytes from the blood of patient are grown in a culture. A functional ADA cDNA is then introduced into these lymphocytes using retroviral vector. Plants respond to changes in intensity of light during various seasons to meet their photoperiodic requirements for flowering. This bacterium contains these proteins in their inactive from. 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. Question18. For example, this technology is used for removing oil from seeds. (a) Adaptations of desert plants and animals: Plants found in deserts are well adapted to cope with harsh desert conditions such as water scarcity and scorching heat. Its exponential growth can be calculated by the following integral form of the exponential growth equation: From the above equation, we can calculate the intrinsic rate of increase (r) of a population. Desert lizards and snakes bask in the sun during early morning and burrow themselves in the sand during afternoons to escape the heat of the day. 3. The rice plant naturally produces beta-carotene pigment in its leaves. Hence, it is affecting our natural environment. Solution : Name an organism that produces it. Bt. Question4. The use of genitically modified crops decreases the post harvesting loss of crops. As the temperature begins to increase, the lizard burrows itself inside the sand to escape the scorching sun. The constituents of oil are glycerol and fatty acids. Bears and squirrels inhabiting cold regions are examples of animals that hibernate during winters. Solution : This is the reason for the proteins to be injected directly into the target site. 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. NCERT solutions for class 12 biology chapter 12 biotechnology and its applications: Through b iotechnology, human produces several products by using microbes, plant, animals and their metabolic machinery. Since beta-carotene is a precursor of provitamin A, it is introduced into the rice variety to fulfil the shortage of dietary vitamin A. Biotechnology and Its Applications- CBSE Notes for Class 12 Biology NCERT Solutions Maths Physics Chemistry Biology Science Biotechnological Applications in Agriculture and Medicine: 1. 4. Question5. 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. Plants have an extensive root system to tap underground water. Parasitism is an interaction between two species in which one species (parasite) derives benefit while the other species (host) is harmed. What is the ecological principle behind the biological control method of managing with pest insects? They are manipulated to express the desirable gene for the production of various commercially important products. List any three important characteristics of a population and explain. Bt. However, this variety of rice has faced a significant opposition from environment activists. (a) Hibernation and Aestivation. List the attributes that populations but not individuals possess. Archaebacteria (Thermophiles) are ancient forms of bacteria found in hot water springs and deep sea hydrothermal vents. Water scarcity is another factor that forces animals to undergo certain adaptations to suit their natural habitat. These organisms contain specialized thermo-resistant enzymes, which carry out metabolic functions that do not get destroyed at such high temperatures. This results in the swelling up of the body, eventually leading to the death of the marine fish. Golden rice is a genetically modified variety of rice, Oryza sativa, which has been developed as a fortified food for areas where there is a shortage of dietary vitamin A. When the inactive toxin protein is ingested by the insect, it gets activated by the alkaline pH of the gut. This is possible only when you have the best CBSE Class 12 Biology Notes, study material, and a smart preparation plan. Find out from internet what is golden rice. Solution : Transgenic bacteria contain foreign gene that is intentionally introduced into its genome. Consult internet and find out how to make orally active protein pharmaceutical. It contains a precursor of pro-vitamin A, called beta-carotene, which has been introduced into the rice through genetic engineering. A Verhulst−pearl logistic curve is also known as an S-shaped growth curve. Light also plays an important role in generating photoperiodic responses occurring in plants. Question10. Solution : Solution : Custom Essay Writing Services: How to Choose the Right One? As a result, the process of pollination by honey bees would be affected. For example, all human beings living at a particular place at a particular time constitute the population of humans. The kangaroo rat found in the deserts of Arizona never drinks water in its life. (d) bacteria encloses toxin in a special sac. Aestivation is a state of reduced activity in some organisms to escape desiccation due to heat in summers. If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or why not? Gene therapy is a technique for correcting a defective gene through gene manipulation. 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. For example, desert lizards are ectotherms. If a functional gene is Introduced into a bone marrow cells at early embryonic stage. These responsive adjustments occur in an organism in order to cope with environmental conditions present in their natural habitats. Cactus leaves (Opuntia) are modified into sharp spines (thorns) to deter herbivores from feeding on them. Compare and contrast the advantages and disadvantages of production of genetically modified crops.

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