11.

Ergot of rye is caused by a species of

• Phytophthora

• Uncinula

• Ustilago

• Ustilago

Which one of the follwing mammalian cells is not capable of metabolising glucose to carbon-dioxide aerobically?

• White blood cells

• Unstriated muscle cells

• Liver cells

• Liver cells

Feeling the tremors of an earthquake a scared resident of the seventh floor of a multistoryed building starts climbing down the stairs rapidly. Which hormone initiated this action?

• Thyroxin

• Adrenaline

• Glucagon

• Glucagon

The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?

• Deletion of non-essential genes

• Super-coiling in nucelosomes

• DNAse digestion

• DNAse digestion

The wavelength of light absorbed by P_r form of phytochrome is

• 640 nm

• 680 nm

• 720 nm

• 720 nm

Which one of the following is not a constituent of cell membrane?

• Cholesterol

• Glycolipids

• Proline

• Proline

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result

• there is no change in success rate of fertilization

• there is high degree of sterility

• one can conclude that the plant is apomictic

• one can conclude that the plant is apomictic

'Foolish seedling' disease of rice led to the discovery of

• GA

• ABA

• 2, 4-D

• 2, 4-D

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is

• cytochrome

• iron-sulphur protein

• ferredoxin

• ferredoxin

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change?

• First negative, then positive and again back to negative.

• First positive, then negative and continue to be negative

• First negative, then positive and continue to be positive

• First negative, then positive and continue to be positive