Good vision depends on adequate intake of carotene rich food. 
Select the best option from the following statements: 

i.	Vitamin A derivatives are formed from carotene
ii.	The photopigments are embedded in the membrane discs of the inner segment
iii.	Retinal is a derivative of Vitamin A
iv.	Retinal is a light-absorbing part of all the visual photopigments

 

1. (i),(iii) and (iv)

2. (i) and (iii)

3. (ii), (iii) and (iv)

4. (i) and (iv)

The DNA fragments separated on an agarose gel can be visualized after staining with:

1. Acetocarmine

2. Aniline blue

3. Ethidium bromide

4. Bromophenol blue

The hepatic portal vein drains blood to the liver from:
1. Stomach
2. Kidneys
3. Intestine
4. Heart

The vascular cambium normally gives rise to:

1. Primary Phloem

2. Secondary xylem

3. Periderm

4. Phelloderm

Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement:

The genotypes of a husband and wife are I^AI^B and I^Ai respectively. Among the blood types of their children, how many different genotypes and phenotypes are possible?

1. 3 genotypes; 4 phenotypes

2. 4 genotypes; 3 phenotypes

3. 4 genotypes; 4 phenotypes

4. 3 genotypes; 3 phenotypes

Which of the following facilitates opening of stomatal aperture?

In Bougainvillea thorns are the modifications of:

1. Adventitious root

2. Stem

3. Leaf

4. Stipules

Which one of the following is related to Ex-situ conservation of threatened animals and plants?

1. Biodiversity hot spots

2. Amazon rainforest

3. Himalayan region

4. Wildlife safari parks

Root hairs develop from the region of:

1. Elongation

2. Root cap

3. Meristematic activity

4. Maturation