STPM Biology Sem 2 Introduction

About _____ of CO2 combined with amino group in the protein to form carbaminohaemoglobin.

• 10%

• 20%

• 30%

• 40%

In stomatal __________, the accumulation of K+ ions causes the water potential in the guard cells to be more negative.

• closing

• opening

Cardiac muscles are myogenic and they can generate their own excitatory impulses.

• True

• False

_______________ is a general term describing a group of cardiovascular disorders that have in common, the thickening, hardening and loss of elasticity of arterial walls.

• Atherosclerosis

• Arteriolosclerosis

• Arteriosclerosis

Presynaptic membrane has voltage-gated _____ ion channels while postsynaptic membrane has voltage-gated _____ ion channels.

• Ca2+; K+

• K+; Ca2+

• Ca2+; Na+

• Na+; Ca2+

Gibberellin and __________ are responsible for seed dormancy breaking.

• auxin

• ethene

• cytokinin

• abscisic acid

Which of the following is the correct sequence of the stages in embryonic development?

• Cleavage --> Gastrulation --> Organogenesis

• Cleavage --> Organogenesis --> Gastrulation

• Organogenesis --> Gastrulation --> Cleavage

• Gastrulation --> Cleavage --> Organogenesis

Which of the following graph refers to the change in parameters (such as height, length or mass) against time?

• Absolute growth curve

• Absolute growth rate curve

• Relative growth rate curve

____________________ supplies blood from the gut bringing along most of the digested food to it.

• Hepatic vein

• Hepatic artery

• Hepatic portal vein

• Sinusoid

In Ornithine cycle, argininosuccinate cleaves to form __________ and __________ with the help of argininosuccinate lyase.

• arginine; oxalosuccinate

• fumarate; arginine

• ornithine; citrulline

• ornithine; arginine