The genetic defect-Adenosine Deaminase (ADA) deficiency may be cured permanently by:

1.	periodic infusion of genetically engineered lymphocytes having functional ADA cDNA
2.	administering adenosine deaminase activators
3.	introducing bone marrow cells producing ADA into cells at early embryonic stages
4.	invitro cell culture therapy

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:

1. maturing

2. elongating

3. widening

4. differentiating

In barley stem, vascular bundles are:

1. open and scattered

2. closed and scattered

3. open and in a ring

4. closed and radial

Sickle cell anaemia is:

If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is:

1. excretory fluid

2. coelomic fluid

3. haemolymph

4. slimy mucus

There is no DNA in:

Point mutation involves:

1. insertion

2. change in single base pair

3. duplication 

4. deletion

Which one of the following has maximum genetic diversity in India?

1. Teak

2. Mango

3. Wheat

4. Tea

In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?

1. R-repolarisation of ventricles

2. S-start of systole

3. T-end of diastole

4. P-depolarisation of the atria

Study the pedigree chart given below:

What does it show?