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You Are On Question Answer Bank SET 2303

115151. First microscope was designed by?

Answer: Anton Van Leeuwenhoek

115152. Who observed Bacteria at first?

Answer: Anton van Leeuwenhoek (1676).

115153. Name the scientist who discoved the chromosomes during cell division?

Answer: Strasburger

115154. The organism carrying highest number of chromosomes is a pteridophyte. It is known as ......?

Answer: Ophioglossum regalis (1262)

115155. Robert Hooke who discovered cell; published his findings in .......?

Answer: Micrographia CELL DIVISION

115156. Who proposed that cells always arises from pre-existing cells?

Answer: Rudolf Virchow

115157. Bovery and Flemming observed mitosis in animal cells. Then who first observed mitosis in plant cell?

Answer: Strasburger

115158. The cell division that brings growth in multicellular organisms is known as............?

Answer: Mitosis

115159. The correct sequence of mitosis is?

Answer: Prophase Metaphase ?

115160. The longest stage of mitosis is.....?

Answer: Prophase

115161. In the shortest phase of mitosis the separation of newly formed chromosomes occurs. Which is that phase?

Answer: Anaphase

115162. Which stage is known as reverse of prophase?

Answer: Telophase

115163. Which cell division helps to maintain the chromosome number of a species?

Answer: Meiosis

115164. What is MITOSIS?

Answer: 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

115165. STEPS IN MITOSIS?

Answer: 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

115166. Mitosis occurs in which type of cells?

Answer: Vegetative cell ( Body cells)

115167. Meiosis occurs in which cells?

Answer: Reproductive cell

115168. In which cell division chromosome number is reduced to half?

Answer: Meiosis

115169. The branch of botany which deals with the life processes in plants is known as?

Answer: plant physiology

115170. Father of Plant physiology?

Answer: Stephen Hales

115171. Father of Indian Plant Physiology?

Answer: Sir J.C. Bose

115172. The movement of particles or molecules of a substance from the region of higher concentration to a region of lower concentration is called ........?

Answer: Diffusion

115173. The total water content present in the soil is known as?

Answer: holard

115174. The water available to the plant from the soil is known as .....?

Answer: Chesard

115175. In a plant cell DNA is present in?

Answer: Chromosomes; Mitochondria; Chloroplast

115176. The non - available water in the soil is called?

Answer: echard

115177. Upward conduction of water occurs through which type of plant cells?

Answer: xylem elements

115178. The loss of water in the form of vapour from aerial parts of the stem is called ............?

Answer: transpiration

115179. Transpiration occurs through which plant part?

Answer: stomata

115180. Any substance applied to plants for the purpose of retarding transpiration is known as?

Answer: antitranspirant

115181. A natural antitranspirant in plants?

Answer: CO2

115182. The process of nitrogen fixation in organisms is controlled by which gene?

Answer: Nifgenes

115183. Non - symbiotic N2 - fixation is carried out by bacteria such as .......... and ..........?

Answer: Azotobacter & Clostridium

115184. Symbiotic N2 - fixation is carried out by which bacteria?

Answer: Rhizobium leguminosarum

115185. Name two non - symbiotic N2- fixing blue - green algae (cyanobacteria)?

Answer: Nostoc; Anabaena

115186. The term Nitrogen fixation denotes?

Answer: Conversion of nitrogen into ammonia

115187. Hydroponics is a method of?

Answer: growth of plants in liquid culture medium

115188. Maximum photosynthesis occurs in which light?

Answer: Red light

115189. The loss of water from plants in the form of liquid is known as?

Answer: Guttation

115190. Guttation occurs through specialised pores known as .....?

Answer: Hydathodes

115191. The plants which are green in colour and capable of synthesizing their own food are known as?

Answer: Autotrophic plants

115192. MICRO ELEMENTS means?

Answer: The elements which are required by plants in small amounts are called micro - elements. Eg. Mn; Zn; B; Cu; Mo & Cl. They are involved in the functioning of enzymes.

115193. The major macro- elements are C; H; O; N; S; P; K; Ca; Mg and Fe ganic food. Such plants are called?

Answer: Heterotrophic plants

115194. The heterotrophic plants which totally depends on living plants or animals for their food are known as?

Answer: Parasites

115195. The heterotrophs which depends on dead and rotten organic remains of plants and animals are called?

Answer: Saprophytes

115196. An association of two dissimilar organisms where both members are benefitted is known as?

Answer: Symbiosis

115197. Name the two major steps in photosynthesis?

Answer: (1) Light reaction; (2) Dark reaction

115198. The splitting of water (photolysis) in photosynthesis occurs in which step?

Answer: Light reaction

115199. Explain PHOTOSYNTHESIS?

Answer: It is the process of manufacture of organic compounds from CO2 and H2O in the presence of sunlight as a source of energy. The first step of photosynthesis is light reaction which occurs in the grana of chloroplast. The major process in this step are (1) Photolysis of water and evolution of O2 (2) Photophosphorylation. It is the process of ATP formation from ADP using light energy. The second step is dark reaction; It occurs in stroma of chroloplast. Here CO2 is reduced to carbohydrates; using AT

115200. Explain ANTI TRANSPIRANTS?

Answer: About 98% of water absorbed by plants on land is evaporated from the aerial parts; through transpiration. Due to this the plant has to face several problems. So the rate of transpiration must to reduced. For this certain substances are used to reduce the rate of transpiration. These are known as antitranspirants. eg : colourless plastics; silicone oils; phenyl mercuric acetate
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