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

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

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Question: What is the significance of “Lac”
Answer: “Lac” is short for the genus Lactobacillus. Many species of Lactobacillus are important in food production, as they are involved in the fermentation process to produce various dairy products, such as yogurt, cheese, and kefir. These bacteria also act as probiotics, providing health benefits to the consumer. Additionally, certain species of Lactobacillus are used in biotechnology to produce lactic acid and other compounds.

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Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (HSEIIRKON1—-15321-A) 

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Write a short note on ‘MTP’.
Answer: MTP (Mixed Tissue Proteins) are proteins found in multiple tissues of the body. These proteins are involved in various functions such as cell signaling, metabolism, and other cellular processes. They are also involved in the cell-to-cell communication network.

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

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Question: Define Immunity. Name its types.
Answer: Immunity is the ability of the body to protect itself from foreign substances, organisms, or toxins.
The three types of immunity are innate immunity, adaptive immunity, and passive immunity.

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Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Paper code (SEIIRKO-13-81020-Q) 

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Question: Define Fertilization. Briefly enlist the events that take place during Fertilization.
Answer: Fertilization is the fusion of a sperm cell and an egg cell to form a single cell that has genetic material from both the egg and the sperm.
Events that take place during Fertilization:
1. Sperm binds to the egg and penetrates its outer layer.
2. The sperm and egg nuclei fuse, forming a single nucleus.
3. The egg is activated and begins the process of cell division.
4. The zygote begins to divide into two cells, then four cells, and so on.
5. The zygote starts to travel down the fallopian tube towards the uterus.

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Botany: Solved Previous Year’s Question Paper for NCERT/CBSE  Class 12th Botany Paper Code (RKDO18 —–20303-X)

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Question: (i)What is primary productivity ?
(ii) Why does it vary in different ecosystems ?
(ii) State the relationship between gross and primary productivity.
Answer: (i) Primary productivity is the rate at which energy is converted into organic matter by living organisms such as plants within an ecosystem.
(ii) It varies in different ecosystems due to the availability of resources, environmental factors such as temperature and light intensity, and the presence of other organisms.
(iii) The relationship between gross and primary productivity is that gross productivity is the total amount of energy produced by an ecosystem, while primary productivity is the amount of energy converted into organic matter. Gross productivity is the sum of all primary production, as well as respiration processes such as decomposition and consumption.

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Zoology: Solved Previous Year Question Paper for NCERT/ CBSE  Class 12th Zoology Paper code (HSEIIRKO– 13) 

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What are Biosafety issues?
Ans: The steps taken to assure the safe use, handling, and disposal of biological materials are referred to as biosafety issues. These concerns include the safe handling of genetically modified organisms, the containment of potentially infectious agents in laboratory settings, and adequate biological waste disposal. It also entails safeguarding the environment, lab workers, and other people from potentially dangerous chemicals.

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Zoology: Solved Previous Year Question Paper for NCERT/ CBSE  Class 12th Zoology Paper code (HSEIIRKO–1) 

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Humans have been producing silk using the silkworm, an insect, for thousands of years. A luxurious material, silk is used to create a variety of products, including clothing, bedding, and drapes. The silkworm is a crucial insect for human prosperity as it gives silk producers a vital source of revenue and aids in the creation of jobs in the textile sector. Since the silkworm is a crucial link in the food chain, it also contributes to the preservation of biodiversity. Numerous birds and other animals consume silkworm larvae, providing a natural food source. The silkworm is a significant pest control tool since it also produces a pesticide that is naturally occurring. The silkworm is a beneficial insect that plays a significant role in human welfare.

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