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

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Write one example the following in the space provided.

Cold blooded animal ______.

Give an example of the following:

Fish possessing poison sting

Give the characteristic features of the following citing one example.

Chondrichthyes and ostichthyes

Name

A cold blooded animal

Give an example for the following:

A fish possessing a poison sting

Give an example for the following:

A fish possessing an electric organ 

How are prosthetic groups different from co-factors?

Cut pieces of beetroot do not leave colour in cold water but do so in hot water. Explain.

Minerals are present in the soil in sufficient amounts. Do plants need to adjust the types of solutes that reach the xylem? Which molecules help to adjust this? How do plants regulate the type and quantity of solutes that reach xylem?

Explain the process of secondary growth in stems of woody angiosperm with help of schematic diagrams. What is the significance?

Find out a qualitative test for proteins, fats and oils, amino acids and test, any fruit juice, saliva, and urine for them.

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.

Give an example for the following:

An organ, which regulates buoyancy

In conifers fibres are likely to be absent in ______.

What constitutes the cambial ring?

A transverse section of the trunk of a tree shows concentric rings which are known as growth rings. How are these rings formed? What is the significance of these rings?

Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiological or anatomical abnormality? Explain in detail.

Write the function of:

Interfasicular cambium

Deciduous plants shed their leaves during summer or in autumn. This process of shedding of leaves is called abscission. Apart from physiological changes what anatomical mechanism is involved in the abscission of leaves.