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Biology (Objective) (Pages :32)
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181 What are conifers?

Ans : The multicellular plants with well developed tissue. Its leaves are simple; smaller and needle like eg : cedrus; pine
182 What are the two classes of flowering plants?

Ans : They are Monocotyledons or Monocots and Dicotyledons or Dicots CELL
183 The fundamental structural and functional unit of all living organisms is?

Ans : Cell
184 The cell was first observed by?

Ans : Robert Hooke
185 The cell theory was formulated by a german botanist and a british zoologist. Who are they?

Ans : The German botanist is Matthias Schleiden and The British Zoologist is Theodore Schwann. They proposed that “the bodies of animals and plants are composed of cells and products of cells”
186 Name the scientist who modified cell theory by giving the postulate “Omnis cellula-e- cellula”?

Ans : Rudolf Virchow He states that all cells arise from pre-existing cells through cell division.
187 Which are the two types of cells?

Ans : Eukaryotic cell and Prokaryotic cell
188 Which are the important cell organelles?

Ans : Endoplasmic reticulum; Mitochondria; Golgic complex; Lysosome; Microbodies; Vacuoles; and Ribosomes
189 Name the non -membrane bound cell organelle which is present in both eukaryotic and prokaryotic cell?

Ans : Ribosomes
190 The smallest cell is?

Ans : Mycoplasmas /PPLO. (Pluro Pneumonia like Organisms) (0.3 m in length)
191 The largest isolated single cell is?

Ans : The egg of Ostrich
192 Which cell organelle is known as “skeletal system of the cell”?

Ans : Endoplasmic reticulum
193 Which cell organelle is called “power house of the cell”?

Ans : Mitochondria Which cell organelle is called “the suicidal bags”?
194 In all cells the cytoplasm is externally bounded by a semi - permeable membrane. It is known as ..............?

Ans : Cell membrane/Plasma membrane
195 Name the microbodies which are known as enzyme bags?

Ans : Peroxisomes and glyoxysomes
196 The membrane bound space in the cytoplasm is known as?

Ans : Vacuole
197 The vacuole is bounded by a single membrane called?

Ans : Tonoplast
198 The small hair like outgrowths of the cell membrane is known as?

Ans : Cilia
199 Comparatively longer hair like outgrowths of the plasma membrane is?

Ans : Flagella
200 Nucleus of the cell was discovered by?

Ans : Robert Brown
201 The semi-fluid substance inside the nuclear membrane is called?

Ans : nucleoplasm or karyolymph
202 The spherical body made up of proteins; rRNAs and r DNAs is found inside the nucleus. It is known as?

Ans : Nucleolus
203 Numerous thread like structures which forms the skeleton of the nucleus; is known as?

Ans : Chromatin network
204 Nucleus contains?

Ans : Nuclearmembrane; Nucleoplasm; Nucleolus; Chromatin threads
205 Who discovered Micro Organism?

Ans : Anton Van Leeuwenhoek (1675)
206 First microscope was designed by?

Ans : Anton Van Leeuwenhoek
207 Who observed Bacteria at first?

Ans : Anton van Leeuwenhoek (1676).
208 Name the scientist who discoved the chromosomes during cell division?

Ans : Strasburger
209 The organism carrying highest number of chromosomes is a pteridophyte. It is known as ......?

Ans : Ophioglossum regalis (1262)
210 Robert Hooke who discovered cell; published his findings in .......?

Ans : Micrographia CELL DIVISION

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