Necrosis (die-back) ofthe tip of young leaves is caused due to the deficiency of

• iron

• manganese

• zinc

• copper

Which one of the following enzymes is responsible for the conversion of norepinephrine to epinephrine?

• Catecholamine-O-methyltransferase

• Phenylalanine-N-methyltransferase

• DOPA decarboxylase

• Monoamine oxidase

Medullary rays are tissues made up of

• phloem parenchyma

• xylem parenchyma

• sieve tube

• sclerenchyma

An allosteric inhibitor of the enzyme acts by binding to the

• substrate

• product

• catalytic site of the enzyme

• non-catalytic site of the enzyme

Which one of the following matching pairs is incorrect?

• Mollusca - Pseudocoel

• Cnidaria - Nematocyst

• Annelida - Chloragogen cells

• Echinodermata - Water vascular system 

Which one of the following matching pairs is incorrect?

• Shell fish - Pisces

• Silver fish - Arthropoda

• Cuttle fish - Mollusca

• Star fish - Echinodermata

The hormone that stimulates the release of pancreatic juice is

• secretin

• glucagon

• inhibin

• insulin

Nitrogenase enzyme is a

• magnesium-iron protein

• molybdenum-iron protein

• iron-copper protein

• nickel-iron protein

Guttation is a process of loss of water in

• liquid form containing dissolved minerals

• liquid form without dissolved minerals

• vapour form with minerals

• vapour form without minerals

Which one of the following group of animals is homeothermic?

• Reptiles

• Amphibians

• Birds

• Fishes