If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of _____.

1. 1. Rate of reaction is indirectly proportional to substrate concentration at this point
   2. Enzymes get denatured at higher substrate conc
   3. All the active sites on enzyme molecule are occupied
   4. None of these

Hydra has_____.

1. 1. Brain
   2. Neuron-cells
   3. Nerves
   4. None of these

During anaerobic respiration the final electron acceptor in electron transport chain is_____.

1. 1. Sulfate
   2. Molecular oxygen
   3. NADP+
   4. water

A structure formed by groups of similar cells organized into loose sheetsor bundles performing similar functions is called as_____.

1. 1. An organ
   2. An organism
   3. A Cell
   4. A Tissue

In planaria, numerous small branches which end blindly are called as_____.

1. 1. Hepatic caeca
   2. Intestinal caeca
   3. Both b & c
   4. Digestive tract

Mantle in molluscs is present over_____.

1. 1. Dorsal visceral region
   2. Head
   3. Ventral muscular foot
   4. None of these

Which of the following animal has a hydrostatic skeleton?

1. 1. Round worm
   2. Tape worm
   3. Earthworm
   4. Pin worm

A bacterium with tuft of flagella at both poles is called_____.

1. 1. Lophotrichus
   2. Amphitrichous
   3. Monotrichous
   4. Peritrichous

The one which is present in all living things is _____.

1. 1. Cell membrane
   2. Cell nucleus
   3. Vacuole
   4. DNA or RNA

S-band locomotion is characteristically seen in_____.

1. 1. Bony fish
   2. Fish like mammals
   3. Cartilaginous fish
   4. All fishes