Science (English Medium) Class 11 - CBSE Question Bank Solutions

Justify the following statements on the basis of external features

Underground parts of a plant are not always roots

Justify the following statements on the basis of external features

Flower is a modified shoot

Differentiate between Fibrous root and adventitious root

What is the following and where do you find them in animal body?

Ciliated epithelium

Describe various types of epithelial tissues with the help of labelled diagrams

Distinguish between Simple epithelium and compound epithelium

What is the average cell cycle span for a mammalian cell?

Distinguish cytokinesis from karyokinesis.

Describe the events taking place during interphase.

What is G₀ (quiescent phase) of cell cycle?

Why is mitosis called equational division?

Name the phase of the cell cycle at which the following event occurs:

Crossing over between homologous chromosomes takes place.

Analyse the events during every stage of cell cycle and notice how the following two parameters change.

1. Number of chromosomes (N) per cell
2. Amount of DNA content (C) per cell

Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

What is the significance of step-wise release of energy in respiration?

Define the term growth.

Why is not any one parameter good enough to demonstrate growth throughout the life of a flowering plant?

Answer briefly: 

Why are villi present in the intestine and not in the stomach?

What are the basic layers of the wall of alimentary canal?

Given the dental formula of human beings