CBSE Class 12 Biology Daily Practice Questions 10 October 2023

CBSE Class 12 Biology Daily Practice Questions 10 October 2023: Solving CBSE Class 12th Biology daily practice questions can help students brace up their preparation, and attain great results in the examination. Furthermore, it helps in retaining learned concepts, and also for thorough revision. The theory examination will be of 80 marks, and solving DPPs will help students test their exam preparation, and enhance problem-solving skills. Hence, CBSE Class 12 Biology Daily Practice Questions 10 October 2023 has been provided here. Students can try answering them to understand where their preparation lies. Additionally, students can also checkCBSE Class 12 Biology Topic-Wise Weightage 2023-24 to know which topics are important to cover for the test. 

CBSE Class 12 Biology Daily Practice Questions 10 October 2023

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

Question 1: Multiple-Choice Questions

Which one of the following processes results in the production of recombinants in future generations? 

(i) Mutation 

(ii) Independent assortment during meiosis I 

(iii) Independent assortment during meiosis II 

(iv) Crossing over of bivalents 

(a) (iv) only 

(b) (ii) and (iv) 

(c) (i), (ii) and (iii) 

(d) (i), (ii), (iii) and (iv) 

Question 2: Very Short Answer Type Question

(a) From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower?
(b) State the fate of the male nuclei present in the pollen tube.

Question 3: Short Answer Type Question

1. Write the characteristics of stem cells.
2. From where can one obtain it in humans? 
3. State any two applications of stem cells in curing human diseases. 

Question 4: Case-Based Question

Gene expresses itself in a cell system as a protein/enzyme. How does an expression of a gene occur in a cell system when does it need to occur, and how the gene expression regulated in a prokaryotic cell system were studied by the combined efforts of Jacque Monod, the biochemist, and Francois Jacob, the geneticist. For their work on lactose metabolism in E. coli a lac they were awarded the Nobel Prize in 1965.

1. Why is lac operon said to be a transcriptionally regulated system? 
2. It is said that the lac operon has to be operational at a very low level in the bacterial cell all the time. Justify.
3. Why is the regulator gene in lac? 
4. (d) Draw a schematic diagram of the lac operon in the absence of an inducer in the culture medium of the bacteria.

Question 5: Long Answer Type Question

(i) Why is the consumption of smack considered an abuse? 

(ii) Name the source plant and one effect of the following drugs on the human body: 

1. Marijuana 
2. Cocaine 
3. Morphin

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