Class 12 Biology notes and question bank — NEB Exam
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178 questions found

121
Short3mOld Question · 2079Solution available

Draw the given diagram and label the tissues which is responsible for secondary growth. Elaborate the activities of this tissue up to the formation of the cambial ring.

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122
MCQ1mOld Question · 2079Solution available

The given vascular bundle is highly specialised by centripetal protoxylem. What is it called?

null

A

Exarch

B

Endarch

C

Mesarch

D

Centrach

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123
MCQ1mOld Question · 2079Solution available

There are many types of chromosomal disorders in organisms, among them euploidy is very common in the population. Which one of the following conditions is true for euploidy?

A

Addition or deletion of one or more chromosome in diploid chromosome

B

Addition of one or more chromosome in diploid chromosome

C

Deletion of one or more chromosome in diploid chromosome

D

Addition or deletion of one set or more than one set of chromosomes in diploid chromosome

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124
Short1mOld Question · 2079Solution available

Write the main characteristics of the given layer Y.

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125
MCQ1mOld Question · 2079Solution available

When a plant cell is placed in a hypertonic solution, it gets plasmolysed as shown in the diagram. Which of the following occupies the space between the cell wall and the shrunken protoplast in such a plasmolysed cell?

null

A

Water

B

Hypertonic solution

C

Isotonic solution

D

Hypotonic solution

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126
MCQ1mOld Question · 2079Solution available

The formation of two male gametes is a peculiar feature in angiosperm. If the first male gamete is fused to oosphere, in which part does the second male gamete fuse?

A

Synergids

B

Egg cell

C

Polar nuclei

D

Antipodal cell

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127
MCQ1mOld Question · 2079Solution available

Which of the following plants is used as biofertilizer?

A

Ko/vox

B

Funaria

C

Azolla

D

Rhizopus

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128
Long8mOld Question · 2079Solution available

One of the Mendelian inheritances states that ’The alleles of different traits can be segregated during gametogenesis and passed independently’. State and explain the essential pattern of inheritance verifying the statement with examples showing cross up to second filial generation with chart and ratio

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129
Short8mOld Question · 2079Solution available

Draw a labelled drawing of the respiratory system of a human being. Why and how oxygen and carbon dioxide are exchanged rapidly in the lungs? What would happen if a person moves to a high altitude? Write your views on how to solve

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130
Long3+4+1Old Question · 2079Solution available

Draw a labelled diagram of the alimentary canal of a human being. Explain the mechanism of the digestion of foods that a person undertakes. What would happen in the digestion when the pancreas is removed?

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131
Long1+2+3+2Old Question · 2079Solution available

Mention the causative agent, mode of transmission, symptoms and control measures of tuberculosis in the community.

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132
Short4mOld Question · 2079Solution available

Overpopulation is a major issue in the development of the nation. Highlight the socioeconomic problems caused by overpopulation and mention how to solve such problems.

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133
Short3mOld Question · 2079Solution available

Any three differences between A and B are:

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134
Short1mOld Question · 2079Solution available

Label A and B.

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135
Short4mOld Question · 2079Solution available

Describe the various steps applied in poultry farming.

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136
Short4mOld Question · 2079Solution available

Describe the process of fertilization of an egg with reference a frog.

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137
Short4mOld Question · 2079Solution available

Compare and contrast areolar tissue and adipose tissue

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138
MCQ1mOld Question · 2079Solution available

A person suddenly falls down and becomes unconscious. A doctor checked and said that it is due to inadequate blood supply to the brain. What would be the type of disorder?

A

Asthma

B

Syncope

C

Heart attack

D

Oedema

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139
MCQ1mOld Question · 2079Solution available

Blood cells are formed in the bone marrow. What is the process of formation of blood called?

A

Haemopoiesis

B

Haemolysis

C

Lymphopoiesis

D

Erythroblastosis

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140
MCQ1mOld Question · 2079Solution available

What are the main processes involved in gastrulation of a frog?

A

Epiboly, involution, cleavage

B

Epiboly, invagination, Involution

C

Involution, epiboly, invagination

D

Involution, invagination, cleavage.

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