Human Health and Diseases — BIOLOGY STD 12 Science — Question

What is the co-relationship between activeness of organism and complexity of transport system?

Give the full form of CT and MRI. How are they different from each other? Where are they used?

Women are often blamed for producing female children. Consequently, they are ill treated and ostracised. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?

What are the unique features of acquired immunity?

Where is an operator' located in a prokaryotic DNA? How does an operator regulate gene expression at transcription level in a prokaryote? Explain.

1. Write the desirable characters a farmer looks for in his sugarcane crop.
2. How did plant breeding techniques help north Indian farmers to develop cane with desired characters?

The cytological observations made in a number of insects led to the development of the concept of genetic/ chromosomal basis of sex-determination mechanism. Honey bee is an interesting example to study the mechanism of sex-determination. Study the schematic cross between the male and the female honey bees given below and answer the questions that follow:

1. Identify the cell divisions ‘A’ and ‘B’ that lead to gamete formation in female and male honey bees respectively.
2. Name the process ‘C’ that leads to the development of male honey bee (drone).

Two children, A and B aged 4 and 5 years respectively visited a hospital with a similar genetic disorder. The girl A was provided enzyme-replacement therapy and was advised to revisit periodically for further treatment. The girl, B was, however, given a therapy that did not require revisit for further treatment.

1. Name the ailments the two girls were suffering from?
2. Why did the treatment provided to girl A required repeated visits?
3. How was the girl B cured permanently?

What is 'biofortification'?

Global warming is caused by 'greenhouse effect. Justify.