CBSE class 12 students are provided with some important 2 marks questions here. The questions are designed according to the latest CBSE curriculum and updated pattern. These 2 marks questions can help to analyze the current preparation level and then strategize accordingly for the CBSE Class 12 Board Exam.
Before moving to the questions, here are a few important pointers.
- 10 questions are asked from 2 marks section with 1 question having a choice.
- 2 marks questions should be written maximum in 2 to 3 lines i.e. 30 to 40 words.
- The answer needs to be a bit explanatory but should not include too many details.
- The board gives step markings for the answers i.e. for diagrams, terms, etc.
- It should be noted that the examiners might not consider additional or irrelevant points if the answer exceeds the word limit by a huge margin.
Students preparing for class 12 board exams are also suggested to check the important questions for Class 12 biology to get chapter-wise biology sample questions for the board exam.
Important 2 marks Biology Questions For Class 12 Exam
The human male and female bird are heterogametic while the human female and male bird are
homogametic. Why are they called so?
What is an allergy? Name the antibody responsible for it. Also, mention two chemicals released from the mast cells during an allergic reaction.
Fed up of a large family, a couple wanted to adopt a terminal method of contraception. Describe the process conducted by the doctor in either of the cases (male / female partner).
Mention the role of histone proteins in the packaging of DNA to form the structure of chromatin fibre.
(a) Grazing food chain and detritus food chain.
(b) Primary and secondary productivity.
How do the following help in cancer treatment?
(a) alpha Interferon
(a) Differentiate between zoospore and zygote.
(b) Which parts of flower develop into perisperm and pericarp?
State any three advanced methods of ex- situ conservation. In which way, do you think, is the advanced methods better than the traditional ex- situ methods?
What are the latest methods of detection of cancer?
State the microbes which help in the commercial production of the following products:
(b) Citric acid
(d) Butyric acid
Suggest two practices giving one example of each, that help protect rare or threatened species.
Give the binomials of two types of yeast and the commercial bioactive products they help to produce.
Differentiate between the genetic codes given below :
(a) Unambiguous and Universal
(b) Degenerate and Initiator
List the two methodologies which were involved in the human genome project. Mention how they were used.
Explain the following phases in the menstrual cycle of a human
(a) Menstrual phase
(b) Follicular phase
What is an ecological pyramid? Write any two limitations of ecological pyramids.
Name the phenomenon, in which a single gene product produces more than one phenotypic effect. Give an example of it, one each from plants and human.
Differentiate between male and female heterogamety.
Many freshwater animals can not survive in the marine environment. Explain.
Explain brood parasitism with the help of an example.
Name the two special types of lymphocytes in humans. How do they differ in their roles in immune response?
Name the bacterium that causes typhoid. Mention two diagnostic symptoms. How is this disease transmitted to others?
State the reasons for the following
(a) The human testes are located outside the abdominal cavity.
(b) Some organisms like honey-bees are called parthenogenetic animals.
Write the cellular contents carried by the pollen tube. How does the pollen tube gain its entry into the embryo sac?
How does culturing Spirulina solve the food problems of the growing human population?
Why are small birds like hummingbirds not found in polar regions?
Name the product of fertilization that forms the kernel of the coconut. How does the kernel differ from coconut water?
Describe the role of lymph nodes in providing immunity.
What happens to corpus luteum in the human female if the ovum is
(b) not fertilized
Mention one application for each of the following :
(a) Passive immunization
List the events that reduce the Biological Oxygen Demand (BOD) of a primary effluent
during sewage treatment.
Discuss the role the enzyme DNA ligase plays during DNA replication.
Why is reproduction essential for organisms?
Distinguish between monohybrid and dihybrid.
Define phenotypic adaptation.
Distinguish between primary and secondary sewage treatment?
What is biodiversity?
What are the structure and functions of the ecosystem?
List out the applications of Biotechnology in agriculture and medicines.
Distinguish between food chain and food web.