NEB Class 11 Science Biology Question Paper 2078

Identify the correct bonding between nitrogen bases in DNA molecule from given pair.

Miller and Urey designed an experiment to recreate the environment of primitive earth to support the theory of biochemical origin of life. Which composition did he use to produce simple amino acids?

Which habitat is needed for xerophytic plants to survive?

"Red rust is one of the destructive diseases in tea plants which results adverse effect on tea yield. It is caused by a type of algae." Which discipline of Biology is related to explain the above statement?

Which of the following is a practice of in-situ conservation of biodiversity?

Which one statement of the following tells the favor of prop root?

Forelimbs (wings) of Dragon fly, Pteranodon, Hawk and Bat are given. What type of organs are these?

Which is the nearest ancestor of modern man?

In the given figure, X denotes an organ of the frog which produces a particular sound. What does that sound indicate?

Trichocysts is an important organelle in Paramecium. Which activities does it associate for?

IUCN noticed the one-horned rhino restricted in Chitwan national park of Nepal as a high-risk group. Its population has declined due to habitat loss, excessive poaching, low rate of breeding, human encroachment and other factors. According to this description, in which risk group does the one-horned rhino of Nepal fall?

Write any five characteristics of Chlorophyceae.

'Gymnosperm is an advanced group than Pteridophyta'. Justify this statement with any five points.

OR

Compare between simple fruit and multiple fruit in two points. How can fruit play an important role for continuity of generation in plant life? $(2\times2+1)$

How can ecological factors influence in pond ecosystem? Discuss it with suitable examples with respect to its structural and functional aspects. $(2+1+2)$

Explain any five ways how microorganisms play an important role in the field of medicine.

The excessive and unbalanced use of pesticides is a prominent environmental issue in Nepal. Mention any three consequences of overuse of pesticides in your locality and suggest an awareness campaign that you would follow in two points. $(3+2)$

What is transverse binary fission? Write its process in Paramecium. $(1+2+2)$

How can pancreas of a frog play an important role in digestion? Explain it in reference to physiology of intestinal digestion. $(2+3)$

OR

Describe with suitable diagram, how copulation and cocoon formation takes place in earthworm. $(2+2+1)$

How does Darwinism explain the theory of organic evolution? Clarify your answer. $(5)$

Why is sexual reproduction important in lower grade plant like fungi? Explain it with respect to sexual reproduction of Yeast along with diagram. $(2+2\times3)$

OR

Explain the diagnostic floral characters of family Solanaceae with floral formula and floral diagram. Write the botanical name of any two plants of this family regarding medicinal and edible values. $(4+1+1+2)$

How is excretion performed in earthworm? Explain in analytical approach of the structure of septal nephridia of earthworm with labeled diagram. $(1+4+3)$

Meiosis cell division maintains chromosomal stability in offspring through reduction and disjunction of homologous chromosomes. Two successive steps within this process are given.

a. In reference to disjunction, what changes do you find between Fig-1 & Fig-2? Describe it. $(4)$

b. What had happened in chromosomal stability if changes did not occur from Fig-1 to Fig-2? $(1)$

c. Draw the diagram of the successive next one step after Fig-2 with two distinguishing features. $(1+2)$