Life process

Which of the following increases in muscle cell when they are lacking in oxygen?

• Carbon dioxide

• Lactose

• Lactic acid

• Uric acid

In cockroaches, air enters the body through:

• Lungs

• Gills

• Spiracles

• Skin

One of the following does not have a nucleus. This one is:

• Red blood cell

• White blood cell

• Guard cell

• Epidermal cell

The blood leaving the tissue s becomes richer in:

• Carbon dioxide

• Water

• Heamoglobin

• Oxygen

Blood is pumped from the heart to the entire body by the :

• Lungs

• Ventricles

• Atria

• Nerves

Which vein brings clean blood from the lungs into the heart ?

• Renal vein

• Pulmonary vein

• Vena cava

• Hepatic vein

Which blood vessels doesn't carry any carbon dioxide ?

• Pulmonary artery

• Vena cava

• Hepatic vein

• Pulmonary vein

The phloem tissue in plants is responsible for the transport of :

• Water

• Water and minerals

• Sugar

• All of the above

Which of the following has a three chambered heart ?

• Pigeon

• Lizard

• Fish

• Lion

The excretory unit in the human excretory system is called :

• Nephron

• Neuron

• Nephridia

• Kidneys