CBSE Class 12 Biology Respiration Notes

Breathing & Exchange of Gases Introduction • It is a process of oxidation of organic compounds in cell in which energy is released.   • According to scientist G.S. Carter, there are 3 steps in respiration :   1.1 External respiration : Gaseous exchange between environment…

CBSE Class 12 Biology Sexual Reproduction In Flowering Plants Minds Map

    Important Questions for NCERT Class 12 Biology Sexual Reproduction in Flowering Plants Ques. The role of double fertilisation in angiosperms is to produce(a) cotyledons (b) endocarp(c) endosperm (d) integuments. Answer: C Ques. Double fertilisation is characteristic of(…

CBSE Class 12 Biology Reproduction In Organisms Minds Map

  Very Short Answer Questions Question. In yeast and Amoeba the parent cell divides to give rise to two new individual cells. How does the cell division differ in these two organisms? Answer. In Amoeba, binary fission takes place whereas in yeast cell division occurs by…

CBSE Class 12 Biology Principles Of Inheritance And Variation Minds Map

    Important Questions for NCERT Class 12 Biology Principles of Inheritance and Variation   Ques. What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile?(a) Down’s syndrome(b) Turner’s syndrome(c) Klinefelter’s…

CBSE Class 12 Biology Organisms And Populations Minds Map

    Important Questions for NCERT Class 12 Biology Organisms and Populations Ques. Gause’s principle of competitive exclusion states that(a) no two species can occupy the same niche indefinitely for the same limiting resources(b) larger organisms exclude smaller ones through…

CBSE Class 12 Biology Molecular Basis Of Inheritance Minds Map

    Important Questions for NCERT Class 12 Biology Molecular Basis of Inheritance Ques. What would happen if in a gene encoding a polypeptide of 50 amino acids, 25th codon (UAU) is mutated to UAA ?(a) A polypeptide of 24 amino acids will be formed.(b) Two polypeptides of 24…

CBSE Class 12 Biology Evolution Minds Map

    Important Questions for NCERT Class 12 Biology Evolution Ques. Convergent evolution is illustrated by(a) rat and dog(b) bacterium and protozoan(c) starfish and cuttle fish(d) dogfish and whale.  Answer: D Ques. Industrial melanism is an example of(a) drug resistance(b)…

CBSE Class 12 Biology Environmental Issues Minds Map

    Important Questions for NCERT Class 12 Biology Environmental Issues Ques. The zone of atmosphere in which the ozone layer is present is called(a) ionosphere (b) mesosphere(c) stratosphere (d) troposphere.  Answer: C   Ques. Kyoto protocol was endorsed at(a) CoP - 6 (b…