• Biology,  Botony

    MCQ ON PLANT REPRODUCTION

    1. Formation of gametophyte directly from sporophyte without meiosis is (a) apospory (b) apogamy (c) parthenogenesis (d) amphimixis. Answer and Explanation: 1. (a): Formation of gametophyte directly from sporophyte without meiosis and spore formation is apospory. The gametophyte has a diploid number of chromosomes such gametophyte may form viable gametes which fuse to form tetraploid sporophyte. Apogamy is the development of sporophyte directly from gametophytic tissue without fusion of gametes. Amphimixis is normal sexual reproduction. Parthenogenesis is the development of an embryo from an egg without fertilization. 2. Parthenogenesis is (a) development of an embryo without fertilization (b) development of fruit without fertilization (c) development of fruit without hormones (d) development of…

  • Biochemistry

    Meiosis

    Meiosis is the type of cell division by which gametes (eggs or sperm) are formed. It involves two divisions and results in four different daughter cells that have 23 chromosomes. This ensures that, when an egg and a sperm unite during fertilization, the resulting embryo will have 46 chromosomes – the normal number for a human. The first meiotic division is called Meiosis I, and the second meiotic division is called Meiosis II. Meiosis I Meiosis one is identical to the stages of mitosis. The only difference is that each stage ends with an “I” to identify it is occurring during Meiosis I. please click here for mitosis Meiosis II…

  • Biology,  Cell biology,  Genetics

    CELL DIVISION

    Every living body is composed of the cell. Some living bodies are made of only one cell. They are called unicellular organism, e.g. Bacteria, Amoeba, Plasmodium, some Fungi and some Algae. Some living bodies are made of more than one cell. These are called the multicellular organism. There are many living bodies, which are made of millions of cells. Living bodies like a human. beings or mango tree etc. are composed of millions of cells. Unicellular organisms increase their number (multiple) by cell division. In this process, one cell divides into two, two to four and so on. In multicellular organisms, a large body consisting of millions of cells develops…

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