Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Botany

Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (RKDO18 20304-X) 

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Color blindness, also known as color vision deficiency, is the inability to distinguish certain colors in the visible light spectrum. It affects around 8% of men and 0.5% of women, with the most common type being red-green color blindness.
Color blindness can be caused by genetic factors or acquired through injury or disease.
Symptoms include difficulty distinguishing between colors, difficulty identifying colors, and difficulty seeing color in low light or bright light.
Treatment for color blindness is not available, but people with the disorder can often find ways to adapt, such as using color-coded objects or specialized lenses.

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Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (SEIIRKON17-15321-A) 

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Dairy farming is the practice of raising dairy animals for the production of milk and other dairy products, such as cheese, butter, and yogurt. Dairy farming involves a variety of activities, such as breeding, feeding, and milking the animals, as well as caring for them and managing the overall operation of the farm. It also includes processing, packaging, and marketing of the dairy products.

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Botany: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Botany Paper Code (HSEIIRKON17—–15320-A)

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Question: With the help of a flow diagram explain the flow of energy in an Ecosystem.
Ans: → Solar Energy from Sun → Plants (Photosynthesis) → Consumers (Herbivores) → Consumers (Carnivores) → Decomposers (Bacteria and Fungi) → Nutrients (Carbon Dioxide, Nitrogen, etc.) → Plants (Respiration) → Consumers (Herbivores) → Consumers (Carnivores) → Decomposers (Bacteria and Fungi) → Nutrients (Carbon Dioxide, Nitrogen, etc.) → Solar Energy from Sun

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Botany: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Botany Paper Code (HSEIIRKN15 6418-Y)

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Question: Do you think microbes can also be used as a source of energy? If yes, how? 

Ans: Yes, microbes can serve as a source of energy. Biomass may be used by microbes to produce biofuels like ethanol and biodiesel that can replace fossil fuels.

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Botany: Solved Previous Year’s Question Paper for NCERT/ CBSE  Class 12th Botany Paper Code (HSEIIRKN15—-6418-X) 

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Point out any three advantages of the tissue culture technique
Ans: 1. Rapid Multiplication: Tissue culture is a method for the quick growth of plants and can quickly multiply thousands of plants.
2. Disease-Free Plants: Tissue culture also aids in the production of disease-free, highly pest- and disease-resistant plants.
3. Quality Control: Tissue culture can be used to control plant quality. It assists in preserving the plants’ intended traits.

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Botany: Solved Previous Year’s Question Paper for   NCERT/ CBSE  Class 12th Botany Paper Code (HSEIIRKO14-1703-Z)

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Mutualism is a sort of symbiotic connection in which both species gain from their association. The relationship between bees and flowers is an illustration of mutualism. The bees gather nectar from the flowers, which gives them sustenance, while the blooms gain from pollination.
Commensalism is a sort of symbiotic interaction in which one organism gains while the other is unaffected. The interaction between barnacles and whales is an illustration of commensalism. The whales are unaffected as the barnacles adhere to them and eat the food scraps they churn up while swimming.

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Botany: Solved Previous Year’s Question Paper for NCERT/CBSE Class 12th Botany

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Question: In a Pisum sativum, the pods may be inflated (I. dominant) or constricted (i. recessive). What proportion of the offspring in the following crosses would be expected to be inflated?
(a) II x ii
(b) li x ii .
(c) II x II
Ans: (A) It would be assumed that all of the offspring would be inflated (100%).
(b) It would be assumed that 50% of the offspring would be inflated.
(c) It would be assumed that all of the offspring would be inflated (100%).

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Botany: Solved Previous Year’s Question Paper for   NCERT/ CBSE  Class 12th Botany Paper Code (SEIIKPJXII-34019-A)

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Why a need is felt to conserve biodiversity?
Ans: The preservation of biodiversity is crucial for the survival of our planet and the well-being of our environment, our economy, and ourselves. Clean air, clean water, and a stable climate are all made possible by biodiversity, which is the variety of life that exists within ecosystems. Additionally, it offers us other necessities for our survival, such as food, medication, and other resources. By protecting species and habitats that are necessary for a healthy world and ecosystem, we are guaranteeing that future generations can continue to take advantage of these crucial resources.

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Botany: Solved Previous Year’s Question Paper for  NCERT/ CBSE  Class 12th Botany Paper Code (HSE2KROXI)

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What kind of threats to biodiversity may lead to its loss?
Ans: Threats to biodiversity that can result in its extinction include habitat loss, pollution, invasive species, climate change, over-exploitation, and environmental changes brought on by humans.
1. Habitat Loss: Human activities like urbanisation, deforestation, and agricultural development are serious threats to biodiversity because they destroy and fragment ecosystems.
2. Climate Change: Climate change is affecting species’ life cycles, producing a shift in their ranges, and altering their abundance and distribution.
3. Pollution: Pollution, such as that in the air, water, and ground, can harm or destroy habitats and result in the extinction of species.
4. Invasive Species: These non-native species have the potential to outcompete native species for resources, reducing biodiversity.
5. Overharvesting: Taking too many species for commercial purposes might result in population decreases and put species in jeopardy.

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