Evolution — BIOLOGY STD 12 Science — Question

Mention one significant difference between ontogeny and phylogeny.

Draw a digrammatic sketch of a dicot embryo and label any four parts including the reduced suspensor.

Suryakant had banana plantation in his field. Quality of the fruit was excellent but the yield suffered due to infection of the plants by a virus. Suggest a fast and efficient method to get healthy and a large number of plants in the next generation without compromising on the existing quality. Justify the selection of your method.

What is a broad spectrum antibiotic? Name a broad spectrum antibiotic and source organism.

What measures will you take to prevent the spread of water borne diseases?

Mention any four applications of DNA fingerprinting?

Distinguish between heterochromatin and euchromatin. Which of the two is transcriptionally active?

Certain attributes of innate immunity are given in the table below. Identify A, B, C, D, E and Frespectively in it.

S.No.	Type of barrier	Example of the barrier	Function
(і)	А	B	Prevent microbial growth
(ii)	C	Polymorpho nuclear leucocytes	D
(iii)	Cytokine	E	F

What is mutualism? Mention any two examples where the organisms involved are commercially exploited in agriculture.

1. What precaution(s) would you recommend to a patient requiring repeated blood transfusion?
2. If the advise is not followed by the patient there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body.

Explain with the help of schematic diagram only how the immune system would get affected and destroyed.