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

What is the basis of classification of algae?

Write a note on the economic importance of algae.

Explain briefly the following term with a suitable example:

Isogamy

Differentiate between the following:

Red algae and Brown algae

Differences between racemose and cymose inflorescence.

Define the term inflorescence. 

Answer the following:

What is the function of nephridia?

How many types of nephridia are found in earthworm based on their location?

Answer in one word or one line.

How many spermathecae are found in earthworm?

Draw a labelled diagram of the reproductive organs of an earthworm

Distinguish between the following - Prostomium and peristomium

Distinguish between the following: Septal nephridium and pharyngeal nephridium

Mention briefly about the circulatory system of earthworm

Mention the function of the following - Body wall in earthworm

Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.

If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?

Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?

Write the differences between open and closed system of circulation

Describe the evolutionary change in the pattern of heart among the vertebrates.

Sino-atrial node is called the pacemaker of our heart. Why?