Ques. Who discovered the nucleus?
(A) ROBERT BROWN (B) MANDEL (C) PURKINJIE (D) ARISTOTLE
Ques2. Which is membrane less organelle?
(A) Nucleus (b) mitochondria (c) ribosome (d)plastid
Ques3. Which is haploid cell?
(A) 1n (b) 2n (c)3n (d) half n
Ques4. What provides color to flowers?
(A) Plastid (b) nucleus (c) cell (d) mitochondria
Ques5. Write postulates of cell theory.
Ques6. What do you mean by division of labour?
Ques.7 what are prokaryotic cells? Write some features.
Ques8. What are digestive bags? Give their role
Ques9.what is energy currency of the cell? How is this energy produced?
Ques.10 what do you mean by the chromatin fibers??
Answers
Answer:
1. Ernest Rutherford's
2. mitochondria
3. single set of hormones
4. plastids
5. All living organisms are composed of cells. ii) The structure and functions of the cells are essentially the same. iii) The function of an organism is the result of the activities and interactions of constituents of the cell.
6. Division of labour, the separation of a work process into a number of tasks, with each task performed by a separate person or group of persons. ... It is most often applied to systems of mass production and is one of the basic organizing principles of the assembly line.
7. The characteristics of prokaryotic cells are: Membrane bound cell organelles such as Mitochondria, Golgi apparatus, Chloroplasts are absent. A membrane bound well defined nucleus is absent. Genetic material is circular DNA and occurs naked in the cell cytoplasm. It is attached to the cell membrane and called nucleoid.
8. Lysosomes are called digestive bags and also the suicide bags of the cell. They act like the stomach of the cell. They digest the cell debris, engulfed viruses and bacteria so they are called digestive bags but sometimes they digest the whole cell so they are called suicide bags.