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

Differentiate between Apoplast and Symplast pathways of water movement. Which of these would need active transport?

Give the location of casparian strip and explain its role in the water movement.

Correct the statements:

Most of the water flow in the roots occurs via the symplast.

Minerals absorbed by the roots travel up the xylem. How do they reach the parts where they are needed most? Do all the parts of the plant get the same amount of the minerals?

Water is indispensable for life. What properties of water make it useful for all biological processes on the earth?

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

What will happen if the filament is replaced in distilled water?

Mitochondria are called powerhouses of the cell. Which of the following observations support this statement?

Explain the term “Energy Currency”. Which substance acts as energy currency in plants and animals?

If a person is feeling dizzy, glucose or fruit juice is given immediately but not a cheese sandwich Explain.

When a substrate is being metabolized, why does not all the energy that released in one step. It is released in multiple steps.What is the advantage of step-wise release?

Respiration requires O₂. How did the first cells on the earth manage to survive in an atmosphere that lacked O₂?

It is known that red muscle fibres in animals can work for longer periods of time continuously. How is this possible?

RuBP carboxylase, PEP carboxylase, Pyruvate dehydrogenase, ATPase, cytochrome oxidase, Hexokinase, Lactate dehydrogenase.

Select/choose enzymes from the list above which are involved in

1. Photosynthesis
2. Respiration
3. Both in photosynthesis and respiration

How does a tree trunk exchange gases with the environment although it lacks stomata?

Which of the following cells does not exhibit phagocytotic activity?

One of the common symptoms observed in people infected with Dengue fever is ______.

Which one of the following types of cells lack nucleus in humans?

Which one of the following blood cells is involved in antibody production?

The cells involved in inflammatory reactions are ______.

Complete the missing word in the statement given below:

______ and monocytes are phagocytic cells.