Select the two correct statements out of the four (a-d) given below about lac operon:

a:	Glucose or galactose may bind with the repressor and inactivate it.
b:	In the absence of lactose, the repressor binds with the operator region.
c:	The z-gene codes for permease.
d:	It was explained by Francois Jacob and Jacque Monod.

The correct statements are:

1.	(b) and (c)
2.	(a) and (c)
3.	(b) and (d)
4.	(a) and (b)

Keel is characteristic of the flowers of:
1. Gulmohur
2. Cassia
3. Calotropis
4. Bean

The kind of epithelium which forms the inner walls of blood vessels is:
1. cuboidal epithelium
2. columnar epithelium
3. ciliated columnar epithelium
4. squamous epithelium

Which one of the following has its own DNA?
1. Mitochondria
2. Dictyosome
3. Lysosome
4. Peroxisome

Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:

1. xenogamy

2. geitonogamy

3. karyogamy

4. autogamy

The genotype of a plant showing the dominant phenotype can be determined by:

1. test cross

2. dihybrid cross

3. pedigree analysis

4. back cross

PGA as the first CO₂ fixation product was discovered in photosynthesis of:
1. Bryophyte
2. Gymnosperm
3. Angiosperm
4. Algae

Study the four statements (a–d) given below and select the two correct ones out of them:

The two correct statements are:
1. a and d
2. a and b
3. b and c
4. c and d

Seminal plasma in human males is rich in:

1. fructose and calcium

2. glucose and calcium

3. DNA and testosterone

4. ribose and potassium

ABO blood groups in humans are controlled by the gene I. It has three alleles – I^A I^B and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?

1. Three

2. One

3. Four

4. Two