Origin and Evolution of Life — BIOLOGY STD 12 Science — Question

With the help of a schematic diagram, explain the location and the role of the following in a transcription unit:
Promoter, Structural gene, Terminator.

Sketch and label – Graafian follicle.

1. What are transgenic animals?
2. Name the transgenic animal having the largest number amongst all the existing transgenic animals.
3. Mention any three purposes for which these animals are produced.

Describe the process of Parturition in humans.

Give an account of poultry diseases.

How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?
Or
How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidogyne incognita?

Complete the table of mineral nutrition of plants.

Mineral element		Where required	Role	Deficiency symptom
(1) Magnesium		Leaves, developing seeds	Activator of enzymes Chlorophyll maintains ribosome structure	Activates certain enzymes carboxylases
(2) Manganese		__________	Chlorosis and grey spots	__________
(3) Molybdenum	__________		Slight retardation of growth	__________

Given below are pairs of diseases and causative organisms. Which out of these is not a matching pair and why?
Filariasis: Wucheraria
Ringworm: Ascaris
AIDS: Human Immuno Virus
Malaria: Plasmodium

Seeing a crowd of students in one corner of the school, the principal rushed to see the matter and found some children beating and chasing a small lizard. On seeing the principal, all the children fled to their classes except Alok who requested the principal to arrange for some medical assistance for the injured animal. The principal rewarded Alok for his attitude to save guard our biodiversity.

1. Mention the factors resulting in loss of biodiversity
2. Was Alok an indisciplined boy, who did not run to the class on seeing the principal? What values does the act promote?

What are the preventive measures against Global warming?