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41
Residual Sodium Carbonate (RSC) value of good water should be
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
42
Which of the following two crops are responsible for almost 75% of pulse production in India?
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Answer & Solution
Answer: Option D
Solution:
Gram and pigeon pea are the two crops that are responsible for almost 75% of pulse production in India.
In the financial year 2021, India's production volume of grams including both horse gram as well as Kabuli chana for the rabi season was nearly 12 million metric tons. And the production of red gram or arhar was 4.43 million tonnes.
43
Which one is the American cotton?
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Answer & Solution
Answer: Option C
Solution:
Gossypium hirsutum is also known as upland cotton or American cotton.
The United States, the world’s largest exporter of cotton, constitutes nearly 95% of all cotton production.
It is native to America which is why also called American or Mexican cotton.
44
Most common herbicide used in maize is
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Answer & Solution
Answer: Option C
Solution:
Simazine is an herbicide of triazine class. It is used to control broad leaved weeds and annual grasses and most commonly used herbicide in maize crops.
Simazine is an off-white crystalline compound that is sparingly soluble in water and comes in the category of residual non-selective herbicide.
45
Partheniumhysterophorus (Congress grass) can be controlled by
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Answer & Solution
Answer: Option C
Solution:
Parthenium hysterophorus (Congress grass) is a species of flowering plant in the family Asteraceae. It is the common invasive species of India that invades disturbed land, including roadsides. It is a serious invasive weed of pasture systems, reducing pasture productivity by 90%.
It can be controlled by Zygogramma bicolarata, a species of leaf beetle also referred to as Parthenium beetle.
46
Movement through Plasmodesmta
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Answer & Solution
Answer: Option B
Solution:
Plasmodesmata are coaxial membranous channels that cross walls of adjacent plant cells, linking cytoplasm, plasma membranes and endoplasmic reticulum of cells.
It allows the direct cytoplasmic cell to cell communication of both small and macromolecules.
It involves symplastic movement of fluids and molecules which means the movement of water in between the cytoplasm and the vacuoles through plasmodesmata beyond the cortex of plant cells.
47
Father of hybrid cotton is
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Answer & Solution
Answer: Option C
Solution:
Dr. C. T. Patel is known as the father of hybrid cotton. The world's first hybrid variety of cotton i.e. H4 was developed by the late Dr. C. T. Patel at Cotton Research Station, Surat, Gujarat in the year 1970. That is why he is known as the father of hybrid cotton.
This hybrid because of its high yield potential became a popular variety among the farmers for cultivation.
48
The temperature known as Biological Zero
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Answer & Solution
Answer: Option C
Solution:
A temperature of 5°C is known as Biological Zero.
This term was first published in the soil science literature in the first edition of soil Taxonomy, and it was described as the temperature below which biological or microbial activity is sufficiently low that reducing conditions do not readily develop in saturated soils.
49
Scientific name of 6 rowed barley
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Answer & Solution
Answer: Option B
Solution:
The scientific name of 6 rowed barley is Hordeum vulgare. The specific feature which makes it 6 rowed variety of barley is having the three spikelets of each cluster fertile so that the spike is six-rowed.
50
A short duration crop in between two main seasonal crops is termed as
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Answer & Solution
Answer: Option D
Solution:
A catch crop is a fast-growing crop that is grown between successive planting of the main crop.
It is a short-duration crop in between two main seasonal crops.
It is a type of successive planting and it makes more efficient use of growing space. It prevents minerals from being flushed away from the soil.