Biology-Objective Related Question Answers
201. The vacuole is bounded by a single membrane called?
Tonoplast
202. The small hair like outgrowths of the cell membrane is known as?
Cilia
203. Comparatively longer hair like outgrowths of the plasma membrane is?
Flagella
204. Nucleus of the cell was discovered by?
Robert Brown
205. The semi-fluid substance inside the nuclear membrane is called?
nucleoplasm or karyolymph
206. The spherical body made up of proteins; rRNAs and r DNAs is found inside the nucleus. It is known as?
Nucleolus
207. Numerous thread like structures which forms the skeleton of the nucleus; is known as?
Chromatin network
208. Nucleus contains?
Nuclearmembrane; Nucleoplasm; Nucleolus; Chromatin threads
209. Who discovered Micro Organism?
Anton Van Leeuwenhoek (1675)
210. First microscope was designed by?
Anton Van Leeuwenhoek
211. Who observed Bacteria at first?
Anton van Leeuwenhoek (1676).
212. Name the scientist who discoved the chromosomes during cell division?
Strasburger
213. The organism carrying highest number of chromosomes is a pteridophyte. It is known as ......?
Ophioglossum regalis (1262)
214. Robert Hooke who discovered cell; published his findings in .......?
Micrographia CELL DIVISION
215. Who proposed that cells always arises from pre-existing cells?
Rudolf Virchow
216. Bovery and Flemming observed mitosis in animal cells. Then who first observed mitosis in plant cell?
Strasburger
217. The cell division that brings growth in multicellular organisms is known as............?
Mitosis
218. The correct sequence of mitosis is?
Prophase Metaphase ?
219. The longest stage of mitosis is.....?
Prophase
220. In the shortest phase of mitosis the separation of newly formed chromosomes occurs. Which is that phase?
Anaphase
221. Which stage is known as reverse of prophase?
Telophase
222. Which cell division helps to maintain the chromosome number of a species?
Meiosis
223. What is MITOSIS?
It is a process of cell division which results in the production of 2 daughter cells from a single parent cell. The daughter cells are identical to one another and also to the original parent cell
224. STEPS IN MITOSIS?
Prophase 1) Formation and doubling of chromosomes 2) Break down of nuclear envelope 3) Disappearance of nucleolus 4) Movement of centrioles to opposite poles Metaphase 1) Chromosomes lie at the equator 2) Formation of spindle fibers 3) Spindle fibers get attached to the chromosomes. Anaphase 1) Separation of newly formed chromosomes towards opposite poles Telophase 1) Chromosomes elongate and overlap to form chromatin 2) Nucleolus begins to reappear 3) Nuclear envelope forms around each group of
225. Mitosis occurs in which type of cells?
Vegetative cell ( Body cells)
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