Organisms and Populations — BIOLOGY STD 12 Science — Question

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?

In an E. coli cloning vector pBR 322, state the role of the following genes:

1. Ori gene.
2. Antibiotic resistance gene.
3. Rop gene.

1. Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanation to your answer.
2. Draw the diagram of a pistil where pollination has successfully occurred. Label the parts involved in reaching the male gametes to its desired destination.

Two types of aquatic organisms in a lake show specific growth patterns as shown below, in brief period of time. The lake is adjacent to an agricultural land extensively supplied with fertilisers.

Answer the questions based on the facts given above:

1. Name the organisms depicting the patterns A and B.
2. State the reason for the growth pattern seen in
3. Write the effects of the growth patterns seen above.

Give reasons : Biogas plants are more often built in rural areas.

Discuss the genetic basis of wrinkled phenotype of pea seed.

Describe physiological effect and applications of gaseous hormone in plants.

Within what age group sexually transmitted diseases (STDs) are reported to be very high. Mention three practices to avoid them.

Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process.

1. Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
2. Identify ‘a’, ‘b’ and ‘c’ in the following table:

No.	Crop	Variety	Insect Pests
1.	Brassica	Pusa Gaurav	(a)
2.	Flat bean	Pusa Sem 2, Pusa Sem 3	(b)
3.	(c)	Pusa Sawani, Pusa A-4	Shoot and fruit borer