TRANSPORT in animals & plants

Which of these correctly describes the event that occurs during ventricular systole.

• The pressure in the ventricle increases

• The pressure in the aorta increases.

• The bicuspid valve opens up.

• The volume of the ventricle increases

Cardiac muscles are myogenic because

• It requires impulse from the parasymphathetic nerve to increase the heart rate

• It requires impulse from the sympathetic nerve to decreases the heart rate

• It does not require impulse from the central nervous system to start contracting

• Its muscles are branched and connected by intercalated discs.

The graph below shows changes in pressure of left atrium, left ventricle and aorta. At which position do the semi lunar valves of the heart open and close?

• Open - I / Close - II

• Open - I / Close - IV

• Open - II / Close - III

• Open - III / Close - IV

Rate of heartbeat increases when

• Stimulated by sympathetic nerves

• Stimulated by parasympathetic nerves

• Decrease in adrenaline concentration

• Decrease in blood pressure

Translocation may occur due to mass flow. The pressure in the hypothesis comes from

• Root pressure

• Transpiration at leaf

• Capillary action of xylem at stem

• Diffusion of water into sieve tubes at leaves

Which of the following are true about endodermal cell?

I It has the casparian strip on its radial wall and transverse wall

II It allows water to diffuse through its wall and cytoplasm

III It allows water to move across its cytoplasm

IV It helps in producing the root pressure

• I and IV

• II and III

• I, III and IV

• II and IV

The rhythm of heartbeat is started by

• The blood pressure

• Sinoatrial node

• Sympathetic nervous system

• Secretion from adrenal gland

The following structures are found in the heart:

I Bundle of His

II Purkinje tissue

III Atrioventricular node

IV Sinoatrial node

Which of the following shows the correct sequence for impulse conduction in the heart?

• III, IV, I, II

• IV, III, I, II

• III, IV, II, I

• IV, III, II, I

The structures below play a role in translocation in plants except?

I Stomata

II Sieve plates

III Mitochondria

IV Casparian strip

• I and III

• I and IV

• II and III

• II and IV

Which of the following initiates depolarization waves of the heart?

• septum

• Purkinje fibers

• Sinoatrial node

• Atrioventricular node