Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Biology

Distinguish between Afferent neurons and efferent neurons.

All living organisms are linked to one another because ______.

Which of the following is a defining characteristic of living organisms?

Amoeba multiplies by mitotic cell division. Is this phenomena growth or reproduction? Explain.

Define metabolism.

A ball of snow when rolled over snow increases in mass, volume and size. Is this comparable to growth as seen in living organisms? Why?

Properties of cell organelles are not always found in the molecular constituents of cell organelles. Justify.

What is meant by living? Give any four defining features of life forms.

Metabolism is a defining feature of all living organisms without exception. Isolated metabolic reactions in vitro are not living things but surely living reactions. Comment.

Do you consider a person in coma-living or dead?

What is the similarity and dissimilarity between “whole moong daal” and “broken moong daal” in terms of respiration and growth? Based on these parameters classify them into living or nonliving?

Some of the properties of tissues are not the constituents of its cells. Give three examples to support the statement.

The male and female reproductive organs of several pteridophytes and gymnosperms are comparable to floral structures of angiosperms. Make an attempt to compare the various reproductive parts of pteridophytes and gymnosperms with reproductive structures of angiosperms.

The placenta is attached to the developing seed near the ______.

A typical angiosperm flower consists of four floral parts. Give the names of the floral parts and their arrangements sequentially.

How can you differentiate between free central and axile placentation?

The following terms has some anatomical significance. What do these terms mean? Explain with the help of line diagrams.

Middle lamella

Common name of some animals are given in Column A, write their scientific name in Column B.

What structural and functional attributes must a cell have to be called a living cell?

It is said that elemental composition of living organisms and that of inanimate objects (like earth’s crust) are similar in the sense that all the major elements are present in both. Then what would be the difference between these two groups? Choose a correct answer from among the following: