Question

For following question, two statements are given one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below: (i) Both A and R are true and R is correct explanation of the assertion (ii) Both A and R are true but R is not the correct explanation of the assertion (iii) A is true but R is false (iv) A is false but R is true 1) Assertion: Eukaryotic cells have more DNA than Prokaryotic cells. Reason: Eukaryotes are genetically more complex than prokaryotes. 2) Assertion : Cell membrane is semipermeable. Reason: The solvent molecules can move freely through the membrane. 3) Assertion : Mitochondria and chloroplast are semi autonomous organelles. Resson: They are formed from the pre-existing organelles and they contain their own DNA. 4) Assertion: Lysosomes are capable to digest carbohydrates, proteins, lipids and nucleic acids. Reason: Lysosomes have basic enzymes. QI. Multiple Choice Questions: 1. Which of these options are not a function of Ribosomes? (i) It helps in manufacture of protein molecules (ii) It helps in manufacture of enzymes (iii) It helps in manufacture of hormones (iv) It helps in manufacture of starch molecules (a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (iv) and (i) 2. Which of these is not related to endoplasmic reticulum? (a) It behaves as a transport channel for proteins between nucleus and cytoplasm (b) It transports materials between various regions in cytoplasm (c) It can be the site of energy generation (d) It can be the site for some biochemical activities of the cell 3. Following are a few definitions of osmosis. Read carefully and select the correct definition (a) Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane (b) Movement of solvent molecules from its higher concentration to lower concentration (c) Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane (d) Movement of solute molecules from lower concentration to a higher concentration of solution through a semipermeable membrane 4. Find out the correct sentence (a) Enzymes packed in lysosomes are made through RER (rough endoplasmic reticulum) (b) Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively (c) Endoplasmic reticulum is related to the destruction of plasma membrane (d) Nucleoid is present inside the nucleoplasm of eukaryotic nucleus 5. Select the odd one out: (a) The movement of water across a semi-permeable membrane is affected by the amount of substances dissolved in it. (b) Membranes are made of organic molecules like proteins and lipids (c) Molecules soluble in organic solvents can easily pass through the membrane. (d) Plasma membranes contain chitin sugar in plants 6. You must have observed that a fruit when unripe is green but it becomes beautifully coloured when ripe. According to you what is the reason behind this colour change. (a) Chloroplasts change to chromosplasts (b) Chromosplasts change to chromosomes (c) Chloroplasts change to chromosomes (d) Chromosplasts change to chloroplasts QII. Answer the following Assertion: reason questions: For following question, two statements are given one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below: (i) Both A and R are true and R is correct explanation of the assertion (ii) Both A and R are true but R is not the correct explanation of the assertion (iii) A is true but R is false (iv) A is false but R is true 1) Assertion: Extracellular materials are important for cell. Reason: Intercellular materials surround the cells and bind them together. 2) Assertion: DNA is associated with proteins. Reason: DNA binds around the histone proteins that forms strings and beeds structure. 3) Assertion: Equational Division maintains the genetic similarity of the somatic cells. Reason: Chromosomes do not undergo crossing over. 4) Assertion: Karyokinesis is followed by cytokinesis. Reason: The cytoplasm should divide first in all types of cell.

Answer 1

1 ) (i)

2 ) (i)

3 ) (i)

4 ) (i)