Which of the following pair is characterised by swollen lips, thick pigmented skin of hands and legs and irritability ?

• Iodine - Goitre

• Protein - Kwashiorkor

• Thiamine - Beri-beri

• Nicotinamide- Pellagra

Phytochrome occurs in two forms. In which form it promotes the germination of seeds of some species ?

• P_fr forms

• P_r forms

• Both forms

• None of these

Tetradynamous stamens are found in :

• Chrysanthemum

• Zinnia

• Poppy

• Brassica

Mutations which alter nucleotide sequence within a gene are :

• frame shift mutations

• base pair substitutions

• both 'a' and 'b'

• none of these

The molecular structure of insulin was first described by :

• Korenberg

• Swaminathan

• Richardson

• Sanger

Which organism was used by Beadle and Tatum to proposed one gene-one enzyme hypothesis ?

• E. coli

• Nostoc

• Drosophila

• Neurospora

Insect resistance transgenic cotton has been produced by inserting a piece of DNA from:

• an insect

• a bacterium

• a wild relative of cotton

• a virus

Human immuno deficiency virus causes

• Acquired immuno deficiency syndrome

• Anthrax

• Tuberculosis

• Polio

When a tall plant with rounded seeds (TTRR) is crossed with a dwarf plant with wrinkled seeds (ttrr), the F₁ generation consists of tall plants with rounded seeds. How many types of gametes an F₁ plant would produce ?

• One

• Three

• Four

• Eight

Diadelphous stamens are the characteristic features of :

• Ranunculaceae

• Fabaceae

• Poaceae

• Malvaceae