The blood circulatory system of vertebrates consists of

A. heart, arteries, capillaries and veins

B. heart, aorta, capillaries and veins

C. heart, aorta, arteries and veins

D. heart, vena cava, arteries, and veins

A plant tissue that carries water and mineral salts is the

A. cambium

B. xylem

C. cortex

D. phloem

Which of the following helps in the clotting of blood?

A. Red blood cells

B. White blood cells

C. Plasma

D. Platelets

The part of the mammalian skin involved in excretion is the

A. sweat glands

B. malpighian layer

C. sebaceous gland

D. horny layer

Which of the following forms about 55% of the volume of the blood in man?

A. leucocytes

B. platelets

C. plasma

D. erythrocytes

Which of the following is a waste product of an insect?

A. Alkaloids

B. Uric acid

C. Sweat

D. Mucilage

The main structure in vertebrates that supports and protects the body is the

A. skeleton

B. ligament

C. muscle

D. joint

The chitin in the exoskeleton of many arthropods is strengthened by

A. lids

B. proteins

C. calcium compounds

D. organic salt

The transfer of pollen grains from the anther to a sigma is

A. propagation

B. placentation

C. pollination

D. fertilization

The male reproductive organ of a flower is the

A. carpel

B. stamen

C. petal

D. sepal