The class teacher focussed a cell under the high power of a compound microscope. He asked the students to identify the cell Whether it is a prokaryotic or eukaryotic cell. Some students identified it as a prokaryotic cell. Discuss the basis of his conclusion.

In the biological practical class, the teacher asked the students to identify the stage of cell division in a slide of runder the objective of a microscope. Some students identified it as of Metaphase of mitosis while other students identificed it as of Metaphse-I of meiosis. Finally, the teacher told the students that it was of Metaphse-I. What is significance of meiosis?

In the biological practical class, the teacher asked the students to identify the stage of cell division in a slide of runder the objective of a microscope. Some students identified it as of Metaphase of mitosis while other students identificed it as of Metaphse-I of meiosis. Finally, the teacher told the students that it was of Metaphse-I. Enlist the differences between Metaphse-I and Metaphase-II of meisosi.

Give scientific reasons for the following statements: The prokaryotic cells are more versatile than the eukaryotic cells in some respect.

Presence of endomembrane system is peculiar structural property of eukaryotic cells as it is absent from the prokaryotic cells. Discuss the following questions: (b) Why these components are considered as an endomembrane system?

Presence of endomembrane system is peculiar structural property of eukaryotic cells as it is absent from the prokaryotic cells. Discuss the following questions: (a) What are components of endomembrane systemof eukaryotic cell?

Observe the following facts : (1) The distance from the Earth to the Sun is 149,600,000,000m (2)The speed of light is 300,000,000 m/sec. (3) Thickness of class VII Mathematics book is 20mm (4) The average diameter of a Red Blood cell is 0.00007mm. (5) The thickness of human hair is in the range of 0.005 cm to 0.01 cm. (6) The distance of moon from the Earth is 384,467,000 m. (approx.) (7) The size of a plant cell is 0.00001275m. (8) Average radius of the Sun is 695000km. (9) Mass of propellant in a space shuttle solid rocket booster is 503600kg (10) Thickness of a piece or paper is 0.0016cm. (11) Diameter of a wire on a computer chip is 0.000003m. (12) The height of Mount Everest is 8848m. There some large number like 150,000,000,000m and some every small numbers like 0.000007m. Identify very large and very small numbers from the above facts and write them in the adjacent table.