Question

Which of these best describes the gametophyte in the alternation of generations life cycle?

A. generation that produces the gametes

B. the diploid generation

C. generation that produces the spores

D. generation that has vascular tissue

E. uses meiosis within structures called sporangia

Plants have a/an _________ life cycle.

	A.	alternation of generations
	B.	asexual-only
	C.	sexual-only
	D.	diplontic
	E.	haplontic

Which of these are gymnosperms?

	A.	all of the above
	B.	cycads
	C.	ginkgo--the maidenhair tree
	D.	conifers

In plants, the dominant generation is _________.

	A.	the larger and more conspicuous generation
	B.	the smaller and less conspicuous generation
	C.	the parent
	D.	dependent upon which plant is discussed
	E.	shorter lived

Answer 1

1) E. uses meiosis within structures called sporangia

The gametophyte is the haplontic phase of the life cycle of plants which is involved in meiosis for the formation of male and female gametes. The sporophyte is the diplontic phase and is usually more prominent during the life cycle of vascular plants.

2) A. alternation of generation

In plants, the gametophyte and sporophyte stages occur alternatively during the life cycle. Gametophyte stage is haplontic and sporophyte stage is diplontic. Most plants are capable of both asexual as well as sexual reproduction.

3) A. All of the above.

Cycads, Ginkgo and conifers are all classified as gymnosperms.

4) A. The larger and most conspicuous generation.

In plants, the generation that occupies the largest part of the life cycle is known as the dominant generation. In angiosperms, the sporophyte is the dominant stage, while is bryophytes etc., the gametophyte is dominant.