Biology Class 12th Practical Viva Questions with Answers in English Medium

Biology Practical Questions

Q1. How many types of proteins are there?

Ans: Protein is the basic component of living cells and is made of carbon, hydrogen, oxygen, nitrogen, and one or more chains of amino acids. There

 three types of proteins one is fibrous, globular, and membrane.

Q2. What are enzymes?

Ans: Enzymes are the substance that catalyzes all aspects of cell metabolism.

Q3. What is a nucleic acid?

Ans: Nucleic acids are biomolecules, that are essential to all known forms of life. The term nucleic acid is the overall name for DNA and RNA.

Q4. Examples of High Protein Foods in biology?

Ans: Monkfish, Pumpkin seeds, Cod, Eggs, Coconut, Bananas.

Q5. What are monosaccharides?

Ans: The sugar units Glucose and fructose are monosaccharides.

Q6. Full form of DNA?

Ans: Deoxyribonucleic acid.

Q7. Full form of RNA?

Ans: Ribonucleic acid.

Q8. Why is meiosis called reduction division?

Ans: Meiosis is called reduction division because the number of chromosomes is halved in the cell after the meiotic division. The number of chromosomes gets halved in the first meiotic division so it is called reduction division.

Q9. Name any 2 xerophytic plants.


a. Ephemeral Annuals: These plants are also called as drought evaders or drought escapers. They are annuals and complete their life cycle within a very short period. They do not withstand dry seasons but actually avoid them. Argemone mexicana, Solatium xanthocarpum.

b. Succulent:

These plants grow in habitats with less or no water. They store water whenever it is available. They have succulent and fleshy organs like stems, leaves and roots which serve as water storage organs and accumulate large amounts of water during the brief rainy seasons. Euphorbia and Opuntia.

Q10: List the contrasting traits that Mendel studied in pea plant.

Ans: Seven pairs of contrasting characters in pea plants were studied by Mendel in his experiments. They were:

a. form of seed;

b. color of cotyledons;

c. color of seed coat;

d. form of pod;

e. color of pod;

f. position of flower;

g. height of plant (length of stem).

Q11. What are mendelian laws ?


  1. The law of inheritance was proposed by Gregor Mendel after conducting experiments on pea plants for seven years.
  2. The Mendel’s laws of inheritance include law of dominance, law of segregation and law of independent assortment.

Q12. What does pollen grain look like under microscope?

Ans: Pollen Grains Under Microscope. Birch tree pollen is transported by the wind, and so is light with a smooth, non-sticky surface to aid its dispersal over distances of thousands of kilometres. A false-colour scanning electron micrograph of an alder tree pollen grain, a major cause of hay fever.

Q17. Who invented the term mitosis?

Ans: In 1873, the German zoologist Otto Bütschli published data from observations on nematodes. A few years later, he discovered and described mitosis based on those observations. The term “mitosis”, coined by Walther Flemming in 1882, is derived from the Greek word μίτος (mitos, “warp thread”).

Q18. Explain Meiosis?

Ans: Meiosis is the process in which a single cell divides twice to form four haploid daughter cells. These cells are the gametes – sperms in males and egg in females. The process of meiosis is divided into 2 stages. Each stage is subdivided into several phases.

Q19. Name two plants and animals found under aquatic conditions?

Ans: For instance, lilies and water hyacinth are aquatic plants. These types of aquatic plants are rooted in the water’s floor. Most of the vegetation of this plant is found underwater. They have thin and narrow leaves.

Aquatic Animals

  1. Seal
  2. Octopus
  3. Turtle
  4. Cuttlefish

Q20. How do hibiscus flowers pollinate?

Ans: Hibiscus pollen germinates on the stamen, the male part of the plant. Then from stamen, it is transferred to the stigma pads of the pistil, the female parts of the plant.

Q21. What are 5 ways to keep the male reproductive system healthy?

Ans: Eat a balanced diet full of fiber, Drink plenty of water, Get enough sleep, Avoid using tobacco, alcohol, or other drugs.

Q22. What are the 4 types of diseases?

Ans: Infectious diseases, deficiency diseases, hereditary diseases, physiological diseases.

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