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

Mention the function of the following - Malpighian tubules

How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not, then how are these transported across the membrane?

Differentiate between for Osmotic Pressure and Osmotic Potential

Even though a very few cells in a C₄ plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?

Discuss “The respiratory pathway is an amphibolic pathway."

Why do we call our heart myogenic?

Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why?

Naked cytoplasm, multinucleated and saprophytic are the characteristics of ______.

Cardiac activity could be moderated by the autonomous neural system. Tick the correct answer:

Suppose you accidentally find an old preserved permanent slide without a label. In your effort to identify it, you place the slide under microscope and observe the following features:-

1. Unicellular
2. Well defined nucleus
3. Biflagellate–one flagellum lying longitudinally and the other transversely.

What would you identify it as? Can you name the kingdom it belongs to?

The embryo sac of an Angiosperm is made up of ______.

If the diploid number of a flowering plant is 36. What would be the chromosome number in its endosperm ______.

Explain why sexual reproduction in angiosperms is said to take place through double fertilization and triple fusion. Also draw a labelled diagram of embryo sac to explain the phenomena.

Match the following and choose the correct option from below

Identify the simple tissue system from the following.

What is present on the surface of the leaves which helps the plant prevent loss of water but is absent in roots?

Below is a list of plant fibres. From which part of the plant these are obtained

Cotton

Epidermal cells are often modified to perform specialized functions in plants. Name some of them and the function they perform.

Plants require water for their survival. But when watered excessively, plants die. Discuss.

The stomatal pore is guarded by two kidney shaped guard cells. Name the epidermal cells surrounding the guard cells. How does a guard cell differ from an epidermal cell? Use a diagram to illustrate your answer.