PART - 1 - Unit III : CH - 10 Cell Cycle and Cell Division — BIOLOGY STD 11 Science — Question

What is cardiac cycle? Write the difference between right ventricle and left ventricle.

Mention the distinctive characters of cyanobacteria.

Name the scientists who proposed the cell theory. Also, list its main postulates.

Ankit, a Xl class student was continuously listening to his sister and her friend's discussion about the growth of plant. They were discussing that plant growth involves three phenomena, i.e., differentiation, dedifferentiation and redifferention. Listening this Ankit interrupted them in between and asked her sister to elaborate the things in detail and the basic phenomenon behind it. As the topic was the part of the Ankit's syllabus also. Her sister explained him that the cells in plant undergo differentiation to attain a maturity in order to perform specific functions.

1. What is dedifferentiation? Name two tissues formed by this process phenomenon.
2. What is redifferentiation?
3. What value is learnt from the Ankit's character as an ideal biology student.

When a freshly collected Spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size:

1. What is this phenomenon called?
2. What will happen if the filament is replaced in distilled water?

Describe in proper sequence, the steps involved in pulmonary respiration in human beings.

Distinguish between the following: Stele and vascular bundle.

Draw a diagram showing comparison of diploblastic and triploblastic organization.

Differentiate between obligate categories and intermediate categories. Demonstrate with the help of a flowchart.

Find out and make a list of proteins used as therapeutic agents. Find other applications of proteins (e.g., Cosmetics etc.)