Looking for the perfect guide to ace your biology viva questions in the 12th class? Well, look no further! We’ve got you covered with the most comprehensive collection of viva questions of biology 12th class. Whether you’re preparing for an upcoming exam or simply want to deepen your understanding of key concepts, this article will provide you with the much-needed assistance. From discussing the intricacies of cellular respiration to exploring the wonders of genetics, each section is designed to simplify complex topics and help you excel in your biology viva. So, let’s dive right in and unravel the fascinating world of biology together!
Viva Questions of Biology 12th Class
Introduction
Biology is a fascinating subject that explores various aspects of life and living organisms. For students studying biology in the 12th class, viva examinations play a crucial role in assessing their understanding and knowledge of the subject. To help you prepare for your biology viva, this article will provide a comprehensive list of potential questions that you might encounter.
Cell Biology
In this section, we will cover viva questions related to cell biology, which is the study of cells and their functions.
1. What is the basic unit of life?
- Answer: The basic unit of life is a cell.
2. Define cell membrane.
- Answer: The cell membrane is a thin, semi-permeable barrier that surrounds the cell and regulates the movement of substances in and out of the cell.
3. What are the different types of cell transport mechanisms?
- Answer: The different types of cell transport mechanisms are passive transport (diffusion and osmosis) and active transport (endocytosis and exocytosis).
4. Explain the process of photosynthesis.
- Answer: Photosynthesis is the process by which green plants convert sunlight, carbon dioxide, and water into glucose and oxygen, using chlorophyll in their chloroplasts.
5. Name the organelle responsible for protein synthesis.
- Answer: The organelle responsible for protein synthesis is the ribosome.
Genetics
In this section, we will cover viva questions related to genetics, which is the study of genes, heredity, and variation.
1. What is a gene?
- Answer: A gene is a segment of DNA that carries the information for a specific trait or function.
2. Explain the difference between genotype and phenotype.
- Answer: Genotype refers to the genetic makeup of an individual, while phenotype refers to the physical characteristics or traits that are expressed.
3. What is a Punnett square used for?
- Answer: A Punnett square is a tool used to predict the probability of offspring inheriting certain traits based on the genotypes of the parents.
4. What is the difference between dominant and recessive traits?
- Answer: Dominant traits are expressed when at least one allele is dominant, while recessive traits are only expressed when both alleles are recessive.
5. Define genetic mutation.
- Answer: Genetic mutation refers to a permanent change in the DNA sequence of a gene, which can lead to variations in traits.
Ecology
In this section, we will cover viva questions related to ecology, which is the study of the interactions between organisms and their environment.
1. Define ecosystem.
- Answer: An ecosystem is a community of living organisms (biotic factors) interacting with the non-living components of their environment (abiotic factors).
2. Explain the concept of food chains and food webs.
- Answer: A food chain shows the flow of energy from one organism to another in a linear sequence, while a food web consists of interconnected food chains and represents a more complex feeding relationship in an ecosystem.
3. What is the difference between a habitat and a niche?
- Answer: A habitat refers to the physical location where an organism lives, while a niche refers to the role or function of an organism within its ecosystem.
4. Describe the process of nitrogen fixation.
- Answer: Nitrogen fixation is the conversion of atmospheric nitrogen gas into a usable form, such as ammonia, by certain bacteria in the soil or root nodules of leguminous plants.
5. Discuss the concept of biodiversity.
- Answer: Biodiversity refers to the variety of life forms present in an ecosystem, including the diversity of species, genes, and ecosystems. It is important for the stability and functioning of ecosystems.
Plant Physiology
In this section, we will cover viva questions related to plant physiology, which is the study of how plants function and respond to their environment.
1. What is transpiration?
- Answer: Transpiration is the loss of water vapor from the aerial parts of a plant, mainly through the stomata in the leaves.
2. Explain the process of photosynthesis in plants.
- Answer: Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen, using chlorophyll in their chloroplasts.
3. What is the role of auxins in plant growth?
- Answer: Auxins are plant hormones that promote cell elongation, regulate apical dominance, and control tropic responses such as phototropism and gravitropism.
4. How do plants adapt to different environmental conditions?
- Answer: Plants have various adaptations such as drought tolerance, shade tolerance, and specific root structures to help them survive and thrive in different environmental conditions.
5. What is the role of gibberellins in plant growth?
- Answer: Gibberellins are plant hormones that promote stem elongation, seed germination, and flowering in plants.
By familiarizing yourself with these viva questions, you can enhance your preparation and boost your confidence when facing your biology viva examination. Remember to study and understand the concepts thoroughly to provide accurate and concise answers. Good luck!
Biology Class 12th Viva Questions – #3 | Biology Practical Viva के टॉप 15 Questions | Exams with MS
Frequently Asked Questions
What is the structure and function of DNA?
DNA, or deoxyribonucleic acid, is a double-stranded molecule found in the nucleus of cells. It consists of two long chains made up of nucleotides. The structure of DNA resembles a twisted ladder, with the nucleotides forming the ladder’s steps and the sugar-phosphate backbone forming the sides. The functions of DNA include storing and transmitting genetic information, providing instructions for protein synthesis, and controlling various cellular processes.
What are the different types of biomolecules?
There are four main types of biomolecules: carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates provide energy and serve as structural components in cells. Lipids are involved in energy storage, insulation, and forming cell membranes. Proteins perform various functions in cells, including enzymatic activity, structural support, and cell signaling. Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Explain the process of photosynthesis.
Photosynthesis is the process by which green plants and some other organisms convert sunlight, carbon dioxide, and water into glucose (a sugar) and oxygen. It occurs in chloroplasts, specifically in the chlorophyll-containing cells of leaves. During photosynthesis, chlorophyll absorbs light energy, which is used to split water molecules into hydrogen and oxygen. The hydrogen is then combined with carbon dioxide to form glucose, while oxygen is released as a byproduct. The glucose produced serves as a source of energy for the plant and is also used for growth and other metabolic processes.
Final Thoughts
In conclusion, the viva questions of biology for 12th class are an important aspect of the examination. These questions test the in-depth understanding of various biological concepts and their practical implications. Students should be well-prepared to confidently answer questions related to topics such as cell structure, genetics, evolution, and ecological interactions. It is crucial to have a clear understanding of the underlying principles and mechanisms in biology to excel in these viva examinations. By practicing and revising these viva questions thoroughly, students can enhance their knowledge and perform well in their biology exams.
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