Kitab Nagri

Internal Structure of Brassica Root   A) Morphology:   It is an underground part of plant. It arises from radical of seed. It has following types:-   i) The root which arises from radical of seed is called primary root.   ii) The root which arises from primary root is called secondary root.   iii)…

External Morphology of Mustard Plant   This plant can be seen in winter season. It produces seeds and dies. It consists of roots, stem, branches, leaves and flowers. On functional basis it is divided into two parts:   i) Vegetative parts:   These parts do not take part in sexual reproduction e.g. root, stern, branches…

Why Cell Division is Necessary   i) Unicellular organism reproduce by cell division.   ii) Cell division is important for growth of multicellular organism.   iii) Cell division is important for replacement of damaged cell.   Most likely, we will have a mixed type of education, which will successfully absorb the advantages of the two…

Mitosis and Meiosis Comparison   Mitosis:   i) It is a type of cell division in which chromosomes remains the same.   ii) One cell gets divided into two cells.   iii) All the somatic cells such as skin cells bone cells, muscle cells, blood cells etc divide by mitosis.   iv) There is no…

Note on Meiosis   Meiosis can be divided into two parts:   i) Meiosis-I ii) Meiosis-II   Meiosis-I:   It has following stages:   Prophase-I:   i) It is very lengthy and important phase.   ii) It is divided into 5 more sub-phases.   iii) Its important process in Synapsis in which homologous chromosomes begins…

Note on Mitosis   Mitosis is a process by which a cell divides into two cells. All organisms grow by cell division. It takes place in all parts of plants and animals.   It has two parts:   A) Karyokinesis (Division of Nucleus) B) Cytokinesis (Division of Cytoplasm)     A) Kagokinesis:   It is…

Short Note on Amoeba   i) Amoeba is simple unicellular organism found in fresh water.   ii) It cannot be seen with naked eye and can only be seen through microscope.   iii) It keeps on changing its shape due to thin flexible cell membrane.   iv) Cytoplasm consists of two parts ectoplasm and endoplasm.…

What is Cell Cycle   All the changes during the formation of daughter cells from a parent cell are called cell cycle.   Then the Chinese authorities banned the activities of such training centers, in which more than fifty percent of the assets belonged to foreign capital. In short, the beginning of the “pandemic” in…

Difference Between Prokaryotes & Eukaryotes   Prokagotic Cell:   i) The organism of prokaryotic cells are called prokaryotes e.g. bacteria.   ii) Chromosomes are present in cytoplasm.   iii) Membrane bounded ceII organelles are not present.   iv) Ribosomes are of small size and freely scattered in cytoplasm.   v) Cell wall is composed of…

Plasmids and what do they do   It is present in leaves, petals, fruits and roots etc.   Colour:   The colour of plastids may vary e.g. Green (chlorophyll), red, blue, yellow, purple and white etc.   Structure:   It is in the form of semi-fluid matrix called stroma. It is composed of protein and…