Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Plant embryo develops from.
In plants, the embryo develops from the zygote. The zygote is formed after the fertilization of the egg cell by a sperm cell. The zygote then undergoes multiple cell divisions and differentiation to form the embryo.
Embryo of flowering plant is always -
The embryo of a flowering plant is always diploid (2n). This is because it develops from the zygote, which is formed by the fusion of a haploid (n) sperm cell with a haploid (n) egg cell, resulting in a diploid (2n) cell.
Plant embryo is a mass of -
Stamen is a modification of
The stamen is a modification of the microsporophyll. The microsporophyll is a leaf-like structure that bears microsporangia, where microspores are produced. In the context of flowering plants, the stamen is the male reproductive part that produces pollen, which contains the male gametes.
A microspore is a
A microspore is the first cell of the male gametophyte. In the life cycle of plants, the microspore undergoes mitotic division to form the male gametophyte, which will eventually produce the male gametes (sperm cells).
An anther consists of
An anther typically consists of four microsporangia. Each microsporangium is a site where pollen (containing microspores) is produced. These microsporangia are grouped in pairs in the anther, making a total of four.
Cells of nucellus are always
The nucellus is the central part of an ovule in seed plants. The cells of the nucellus are diploid (2n) because they are part of the sporophytic tissue. This means they carry a full set of chromosomes, one from each parent.
The embryo sac is produced from
The embryo sac in flowering plants is produced from a megaspore. Through a process called megasporogenesis, one of the four megaspores produced undergoes three rounds of mitotic division to form the embryo sac, which is the female gametophyte.
An egg-apparatus contains
An egg-apparatus in the embryo sac of an angiosperm consists of one egg cell and two synergids. The synergids help in guiding the pollen tube to the egg cell for fertilization.
In angiosperm the endosperm nucleus is
In angiosperms, the endosperm nucleus is formed by the fusion of one sperm nucleus with two polar nuclei, making it triploid (3n). This triploid endosperm provides nourishment to the developing embryo.
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