Which of the following best describes the male and female reproductive structures of an angiosperm? a) angiosperms produce flowers, inside which the male stamens hold the pollen and the female pistil holds the ovule.

b) angiosperms produce male and female cones, and the pollen from a male cone fertilizes the egg inside a female cone.

c) angiosperms produce male and female gametophytes, and the male gametophyte produces spores that fertilize eggs inside the female gametophyte.

d) angiosperms produce sporangia, which release spores that develop into male flowers containing pollen and female flowers containing ovules.

The correct answer is A) Angiosperms produce flowers, inside which the male stamens hold the pollen and the female pistil holds the ovule.

Flowers are the reproductive organ of angiospermic plants. A typical bisexual flowers contains reproductive or essential whorls called androecium and gynoecium. An androecium is made of male reproductive units called stamen. Similarly a gynoecium is made of female reproductive units called  pistil or carpel. Stamens contains anthers which produces pollen grains and a carpel contains ovary within which ovules are present.  

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

answer:   option a) glucagon was secreted by his pancreas before he ate the cookies because blood glucose was low. insulin was secreted after he ate the cookies because his blood glucose was high.

explanation: