CBSE Class 12 Biology Daily Practice Questions 14 October 2023

CBSE Class 12 Biology Daily Practice Questions 14 October 2023: For all candidates preparing for the upcoming CBSE Class 12 examination, here are daily practice questions from the Biology segment. The CBSE Class 12 Biology Daily Practice Questions have been taken from last year’s question paper. Candidates can try to solve the following questions to test their preparation for the examination and improve their chances of securing the highest marks among their peers.  

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CBSE Class 12 Biology Daily Practice Questions 14 October 2023

Students can analyze their CBSE Class 12 Biology preparation by solving daily practice questions provided below: 

Question 1: Multiple-Choice Question

The first gene-sequenced crop is: 

(a) Wheat 

(b) Tobacco 

(c) Rice 

(d) Cotton

Question 2: Very Short Answer Type Question

Explain the process by which a bacterial cell can be made ‘competent’ to take up foreign DNA from its surroundings, using divalent cations and temperature treatment.

Question 3: Short Answer Type Question

With the help of a schematic diagram only, show in three steps, the formation of recombinant DNA by the action of restriction endonuclease EcoRI and DNA ligase.

Question 4: Case-Based Question

The diagram shows the life cycle of a pathogenic protozoan.

1. Name the parasitic stage that is being transferred from host ‘X’ to host ‘Y’.
2. Write the changes the parasite undergoes in the liver.
3. Trace the changes the parasite undergoes when the host ‘X’ takes its blood meal from infected host ‘Y’. OR At which stage during the life cycle of the pathogen does the host ‘Y’ experience the symptoms of the disease? Name the disease and the toxic substance responsible for these symptoms.

Question 5: Long Answer Type Question

Observe the diagram given below showing the menstrual cycle of a normal human female and answer the questions that follow:

(i) What are the suitable technical terms used for the following?

1. Days 1 - 7
2. Days 8 - 12
3. Days 16 - 28
4. Days 13 - 15 

(ii) Explain the role of ovarian and pituitary hormones during the following time periods:

1. Days 8 - 12
2. Days 13 - 15
3. Days 16 - 28 

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