Question

Which of the following is true of conifers

a. the sporophytes grow directly from the gametophyte
b. the spores release from the gametophyte
c. the gametophytes grow directly from the sporophyte
d. the spores release from the male cones

Answer 1

The gametophytes grow directly from the sporophyte

Basic Explanation:

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Detailed Explanation:

The life cycles of gymnosperms have distinctive differences from the cycles of mosses and ferns. The most notable difference is the diminished role of haploid spores (1n) in asexual reproduction. For the most part, this stage stays hidden from the world. The adult sporophyte (2n) creates male and female cones (2n) on separate branches of the same plant. These cones are not the gametophytes, as one would guess, since they are male and female. The cones contain the haploid spores of the asexual reproduction cycle. These spores don’t release into the environment and grow into separate gametophytes as they do in mosses. Instead, the male and female gametophytes (1n) grow from the haploid spores (1n) hidden inside the cones. The male gametophytes (pollen) disperse with the wind to the sticky female cones where the female gametophytes are enclosed. The gametes inside the pollen grain are not flagellated sperm, like mosses and ferns. Therefore, a pollen tube grows from the pollen grain, allowing the male gametes to travel to the eggs cells inside the female gametophyte. Once fertilization occurs, a seed (2n) forms that drops to the ground and grows into the sporophyte we recognize as the gymnosperm.

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Answer 2

It is true that the gametophytes grow directly from the sporophyte

Answer: Option C

Step-by-step explanation:

Conifers are distinct by the presence of evergreen needle shaped leaves and seeds that are generally attached to the cone. The conifers are generally pines which grow into tall trees and bonsai varieties are the smallest. They do not produce seeds in the fruits like other trees rather store it in a thick woody cone where it can be protected during forest fires.

In conifers the process from pollination to fertilization takes about a year. The plant in which the gametophyte grows is called as the sporophyte. This sporophyte is where the male and female gametes fuse together to form the first cells the zygote. Then this zygote develops into a seed. This seed is then disbursed through wind and end up forming a new baby plant called the sporophyte.