Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:
1. Growth response
2. Defence action
3. Effect on reproduction
4. Nutritive value
By which method was a new breed 'Hisardale' of sheep found by using Bikaneri ewes and Marina rams?
1. Mutational breeding
2. Crossbreeding
3. Inbreeding
4. Outcrossing
The infectious stage of plasmodium that enters the human body is:
1. Sporozoites
2. Female gametocytes
3. Male gametocytes
4. Trophozoites
The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and early morning is:
1. Root pressure
2. Imbibition
3. Plasmolysis
4. Transpiration
From his experiments, S.L. Miller produced amino acids by mixing which of the following in a closed flask:
1.
2.
3.
4.
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
1. | Gross primary productivity is always more than Net primary productivity. |
2. | Gross primary productivity and Net primary productivity are one and the same. |
3. | There is no relationship between Gross primary productivity and Net primary productivity. |
4. | Gross primary productivity is always less than net primary productivity. |
The sequence that controls the copy number of the linked DNA in the vector is termed as :
1. | Ori site | 2. | Palindromic sequence |
3. | Recognition site | 4. | Selectable marker |
Cuboidal epithelium with brush border of microvilli is found in :
1. Ducts of salivary glands
2. Proximal convoluted tubule of nephron
3. Eustachian tube
4. Lining of intestine
The body of the ovule is fused within the funicle at :
1. | Micropyle | 2. | Nucellus |
3. | Chalaza | 4. | Hilum |
In light reaction, plastoquinone facilitates the transfer of electrons from:
1. Cytb6f complex to PS-I
2. PS-I to NADP+
3. PS-I to ATP synthase
4. PS-II to Cytb6f complex