| 51 |
A breeder wants to transfer a single disease-resistance gene into an otherwise excellent variety. The most su… |
Agriculture
Plant breeding: history, objectives and methods |
Hard |
| 52 |
Virus-free plants can be obtained through tissue culture of the: |
Agriculture
Plant breeding: history, objectives and methods |
Medium |
| 53 |
The bacterium used as a natural vector to transfer genes into plants is: |
Agriculture
Plant biotechnology |
Easy |
| 54 |
The insect-killing gene in Bt cotton is obtained from: |
Agriculture
Plant biotechnology |
Easy |
| 55 |
Golden Rice was developed to increase the content of: |
Agriculture
Plant biotechnology |
Medium |
| 56 |
Enzymes that cut DNA at specific base sequences are called: |
Agriculture
Plant biotechnology |
Medium |
| 57 |
Selecting plants for a desired gene by testing their DNA rather than their appearance is called: |
Agriculture
Plant biotechnology |
Hard |
| 58 |
What is the pH of a solution whose hydrogen ion concentration is 10⁻⁵ mol/L? |
Agriculture
pH and buffers |
Easy |
| 59 |
A solution of pH 3 has how many times more hydrogen ions than a solution of pH 4? |
Agriculture
pH and buffers |
Medium |
| 60 |
Which pair can form a buffer solution? |
Agriculture
pH and buffers |
Easy |
| 61 |
For an acetic acid buffer (pKa = 4.76), what is the pH when the salt-to-acid ratio is 10? |
Agriculture
pH and buffers |
Hard |
| 62 |
The main buffer system that keeps blood pH near 7.4 is the: |
Agriculture
pH and buffers |
Medium |
| 63 |
Lactose, the sugar of milk, is made of: |
Agriculture
Biomolecules |
Easy |
| 64 |
The bond linking amino acids in a protein is the: |
Agriculture
Biomolecules |
Easy |
| 65 |
Which vitamin is water-soluble? |
Agriculture
Biomolecules |
Medium |
| 66 |
Deficiency of vitamin B₁ (thiamine) causes: |
Agriculture
Biomolecules |
Medium |
| 67 |
Amylase, which breaks down starch using water, belongs to which enzyme class? |
Agriculture
Biomolecules |
Hard |
| 68 |
The main storage carbohydrate in plants is: |
Agriculture
Biomolecules |
Easy |
| 69 |
The fungal cell wall is mainly made of: |
Agriculture
Micro-organisms |
Easy |
| 70 |
Rod-shaped bacteria are called: |
Agriculture
Micro-organisms |
Easy |
| 71 |
The antibiotic streptomycin is obtained from: |
Agriculture
Micro-organisms |
Medium |
| 72 |
Which feature is true of viruses? |
Agriculture
Micro-organisms |
Medium |
| 73 |
Anabaena and Nostoc, which fix nitrogen in rice fields, are best classed as: |
Agriculture
Micro-organisms |
Hard |
| 74 |
Conversion of ammonium to nitrite in soil is carried out by: |
Agriculture
Role of micro-organisms |
Easy |
| 75 |
The products of yeast fermentation of glucose are: |
Agriculture
Role of micro-organisms |
Easy |
| 76 |
Which organism fixes nitrogen while living freely in the soil, without a host plant? |
Agriculture
Role of micro-organisms |
Medium |
| 77 |
Wheat straw added to soil decomposes slowly mainly because it has a: |
Agriculture
Role of micro-organisms |
Hard |
| 78 |
Loss of soil nitrogen as N₂ gas under waterlogged conditions is called: |
Agriculture
Role of micro-organisms |
Medium |
| 79 |
The setting of milk into curd is due to: |
Agriculture
Role of micro-organisms |
Easy |
| 80 |
The single cotyledon of a maize grain is called the: |
Agriculture
Seed structure |
Easy |
| 81 |
In a monocot seed, the sheath that protects the plumule is the: |
Agriculture
Seed structure |
Medium |
| 82 |
The protein-rich outer layer of the endosperm in cereal grains is the: |
Agriculture
Seed structure |
Medium |
| 83 |
The scar on a seed marking where it was attached to the fruit is the: |
Agriculture
Seed structure |
Easy |
| 84 |
In which crop do the cotyledons come above the soil during germination? |
Agriculture
Seed structure |
Hard |
| 85 |
Food in a gram (chickpea) seed is stored mainly in the: |
Agriculture
Seed structure |
Easy |
| 86 |
In flowering plants, the endosperm formed by triple fusion is: |
Agriculture
Reproduction, pollination and fertilisation |
Easy |
| 87 |
Papaya, which commonly has separate male and female plants, is an example of a: |
Agriculture
Reproduction, pollination and fertilisation |
Easy |
| 88 |
In maize, pollen is shed before the silks of the same plant are receptive. This is called: |
Agriculture
Reproduction, pollination and fertilisation |
Medium |
| 89 |
Which crop is normally self-pollinated? |
Agriculture
Reproduction, pollination and fertilisation |
Medium |
| 90 |
Formation of seed without fertilisation is called: |
Agriculture
Reproduction, pollination and fertilisation |
Hard |
| 91 |
Potato is commercially propagated through: |
Agriculture
Reproduction, pollination and fertilisation |
Easy |
| 92 |
The tag colour on a bag of certified seed is: |
Agriculture
Seed dormancy and types of seeds |
Easy |
| 93 |
Breaking dormancy of hard-coated legume seeds by rubbing them with sand paper is called: |
Agriculture
Seed dormancy and types of seeds |
Easy |
| 94 |
Foundation seed is produced from: |
Agriculture
Seed dormancy and types of seeds |
Medium |
| 95 |
Keeping moist seeds at low temperature for several weeks to break dormancy is called: |
Agriculture
Seed dormancy and types of seeds |
Medium |
| 96 |
A plant hormone that promotes seed dormancy is: |
Agriculture
Seed dormancy and types of seeds |
Hard |
| 97 |
Seed of the highest genetic purity, maintained by the original breeder, is called: |
Agriculture
Seed dormancy and types of seeds |
Medium |
| 98 |
Who is known as the Father of the White Revolution in India? |
Agriculture
Importance of livestock |
Easy |
| 99 |
Operation Flood was launched in 1970 by the: |
Agriculture
Importance of livestock |
Medium |
| 100 |
The White Revolution refers to a large increase in the production of: |
Agriculture
Importance of livestock |
Easy |