NEB Question Browser
Explore Class 12 Biology past and model questions by chapter, year, marks and question type.
178 questions found
What kind of enzyme is needed for digestion of milk protein in human beings?
Rennin
Lactase
Pepsin
Sucrase
“Genes are inherited in new combination due to crossing over in the gametes”. Interpret this statement with its mechanism and necessary diagrams. Assess its significance also.
Semi-conservative mode of DNA replication is the most common mode of replication which results in two identical daughter DNA molecules. Explain various enzymes and mechanism involved during this process with necessary diagrams
In frog, coelom is derived from which embryonic layer?
Ectoderm
Mesoderm
Endoderm
Mesoglea
Three German biochemists Embden, Meyerhof and Parnas (EMP) worked out a pathway which involved the formation of pyruvic acid from a glucose molecule. Identify this pathway. Name the site where this pathway takes place in a cell. Construct a step by step pathway developed by them. List the net gain of ATP in this pathway.
Biotechnology is an emerging discipline in this era. Would you think it can be used to mitigate the problem of food scarcity in context to Nepal? Justify your opinion.
Assuming you are provided seeds for germination, which influencing parameters you need to follow for normal germination? What would happen when seeds are kept in low temperature
State the function of part D.
Name the parts A to D.
Identify the given figure.
Define vascular bundle. What type of vascular bundle is present in monocot root? Mention any two functions of vascular bundle.
Which of the following tissue lacks blood supply?
Areolar
Muscular
Bone
Cartilage
What basis would you apply to distinguish a meristematic tissue from a permanent tissue?
Supporting plant
Providing food
Activating cell division
Losing ability of cell division
Which type of mutation is caused by the addition or deletion of a single nitrogenous base?
Transition
Transversion
Frame shift
Substitution
Which one of the following parts is not responsible for transpiration in plants?
Root
Stem
Leaves
All aerial parts
What type of development of an embryo from an unfertilized egg is called?
Parthenocarpy
Parthenogenesis
Polyembryogeny
Polycarpy
A human being usually takes complex foods in her/his diet. However, our body needs its simpler form. Describe how the complex foods are converted into simpler forms within alimentary canal. Draw it with a well labeled diagram of alimentary canal. What would happen in digestion if the gall bladder is removed surgically?
Compare and contrast areolar and adipose connective tissue.