- Tardigrade
- Question
- Biology
- Consider the following four statements whether they are correct or wrong (A) The sporophyte in liverworts is more elaborate than that in mosses (B) Salvinia is heterosporous (C) The life-cycle in all seed-bearing plants is diplontic (D) In Pinus, male and female cones are borne on different trees The two wrong statements together are
Q.
Consider the following four statements whether they are correct or wrong
(A) The sporophyte in liverworts is more elaborate than that in mosses
(B) Salvinia is heterosporous
(C) The life-cycle in all seed-bearing plants is diplontic
(D) In Pinus, male and female cones are borne on different trees
The two wrong statements together are
Solution:
The sporophyte of mosses is more developed than the liverwort. The simplest sporophyte that is found in Riccia (A liverwort) is represented by a capsule. In Funaria, a moss, the most complex sporophyte is found. The sex organs, antheridia and archegonia are formed at the apex of the leafy shoots in sexual reproduction. The zygote develops into a sporophyte after fertilization, that is composed of a foot, seta and capsule. Spores are contained in the capsule. Following meiosis, spores are produced. There is an elaborate spore dispersal mechanism for the mosses. However, due to the presence of intercalary meristem, in Anthoceros (a hornwort), the most advanced sporophyte is found.
Pinus (a gymnosperm) is a monoecious plant that bears male and female cones on various branches of the same plant.
Genera such as Selaginella and Salvinia are known as heterosporous, producing two types of spores, macro (large) and micro (small) spores. The megaspores and microspores, respectively, germinate and give rise to female and male gametophytes.
In diplontic life cycle , gametes undergo meiosis and the dominant and independent phase is diploid sporophyte. Gametes are haploids and are referred to as gametophytes. It is present in all seed bearing plants i.e. Gymnosperms and Angiosperms.
Pinus (a gymnosperm) is a monoecious plant that bears male and female cones on various branches of the same plant.
Genera such as Selaginella and Salvinia are known as heterosporous, producing two types of spores, macro (large) and micro (small) spores. The megaspores and microspores, respectively, germinate and give rise to female and male gametophytes.
In diplontic life cycle , gametes undergo meiosis and the dominant and independent phase is diploid sporophyte. Gametes are haploids and are referred to as gametophytes. It is present in all seed bearing plants i.e. Gymnosperms and Angiosperms.