Annidation and Allelopathy

Question No. 1 Marks +1 -0 Time

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What is Annidation primarily defined as?

A. The process of nutrient depletion by fast-growing cereals.
B. The complimentary interaction between intercrops.
C. The harmful effect of one crop on another.
D. The competitive interaction between intercrops.

Question No. 2 Marks +1 -0 Time

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Which of the following best describes Spatial Annidation?

A. Interactions where crops compete for light and water.
B. The timing differences in nutrient demand between crops.
C. Complimentary interactions between intercrops regarding their spatial position.
D. Interactions that occur only through chemical substance release.

Question No. 3 Marks +1 -0 Time

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Multistorey cropping is an example of which type of annidation?

A. Negative Allelopathy
B. Temporal Annidation
C. Functional Allelopathy
D. Spatial Annidation

Question No. 4 Marks +1 -0 Time

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In aerial spatial annidation, what is a characteristic of taller intercrops?

A. They are relatively tolerant to strong light and high evaporative demand.
B. They inhibit the germination of shorter crops.
C. They are shade-loving and prefer high humidity.
D. They have shallow root systems to exploit surface nutrients.

Question No. 5 Marks +1 -0 Time

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Temporal Annidation is characterized by intercrops having:

A. The same natural habit and growth cycle.
B. Widely varying durations and different peak demands for light and nutrients.
C. Identical peak demands for light and nutrients.
D. Significant competition for resources.

Question No. 6 Marks +1 -0 Time

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What is the definition of Allelopathy?

A. The process of rapid decomposition of crop residues.
B. The complementary interaction between intercrops in time.
C. The beneficial interaction between legumes and cereals.
D. The competitive or non-competitive interaction between crops through the release of chemical substances.

Question No. 7 Marks +1 -0 Time

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Which of the following is a known source of allelochemicals?

A. Only the leaves of the plant.
B. Exudates from roots or products from the decomposition of residues.
C. Only the flowers of the plant.
D. Only the roots of the plant.

Question No. 8 Marks +1 -0 Time

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Which crop is explicitly mentioned as being unsuitable for intercropping or sequential cropping due to its allelopathic effect?

A. Maize
B. Groundnut
C. Urd
D. Sunflower

Question No. 9 Marks +1 -0 Time

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What is the primary benefit of allowing a 15-20 day period between the harvest of sunflower and the sowing of a subsequent crop?

A. To allow for the decomposition of sunflower residues and escape allelopathic effects.
B. To increase the soil's water retention capacity.
C. To promote the growth of beneficial microorganisms.
D. To allow the subsequent crop to establish deeper roots.

Question No. 10 Marks +1 -0 Time

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What distinguishes 'True allelopathy' from 'Functional allelopathy'?

A. True allelopathy only affects germination, while functional allelopathy affects growth.
B. True allelopathy is always harmful, while functional allelopathy is always beneficial.
C. True allelopathy involves a precursor converted by microorganisms, while functional allelopathy does not.
D. True allelopathy involves direct release of toxic substances, while functional allelopathy involves a precursor converted by microorganisms.

Question No. 11 Marks +1 -0 Time

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When chemical substances released by one species inhibit plants of other species, this is known as:

A. Allo-inhibition
B. Legume Effect
C. Auto-inhibition
D. Negative Allelopathy

Question No. 12 Marks +1 -0 Time

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What is the 'Legume effect'?

A. The beneficial effect of legumes in a cropping system.
B. The competition between legumes and cereals for potassium.
C. The negative impact of legumes on soil nitrogen.
D. The release of toxins by legumes that inhibit other crops.

Question No. 13 Marks +1 -0 Time

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How do legumes primarily improve the nitrogen status of the soil?

A. By absorbing nitrogen directly from the air through their leaves.
B. By fixing atmospheric nitrogen in their root nodules.
C. By releasing nitrogen from their stems during decomposition.
D. By competing with other plants for soil nitrogen.

Question No. 14 Marks +1 -0 Time

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Which of the following is NOT considered a benefit of the Legume Effect?

A. Saving up to 25% of recommended nitrogen application for associated cereals.
B. More efficient absorption of soil phosphorus.
C. Strong competition with cereals for the absorption of monovalent cations like K+.
D. Converting inorganic phosphorus into organic form.

Question No. 15 Marks +1 -0 Time

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What is the 'Sorghum Effect' primarily associated with?

A. Rapid decomposition of crop residues leading to nitrogen mineralization.
B. Temporary immobilization of soil nitrogen due to slow decomposition of high C:N ratio residues.
C. Improved phosphorus availability for succeeding crops.
D. Stimulation of growth in associated crops through hormone-like substances.

Question No. 16 Marks +1 -0 Time

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How can the 'Sorghum Effect' be reduced for a succeeding crop?

A. By allowing a 15-20 day gap between harvest and sowing.
B. By planting Ragi immediately after Sorghum.
C. By applying 25% more nitrogen at the time of the succeeding crop's first fertilizer dose.
D. By growing deep-rooted species after Sorghum.

Question No. 17 Marks +1 -0 Time

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What is the 'Cotton Effect'?

A. The allelopathic inhibition of subsequent crops by cotton residues.
B. Cotton's ability to fix atmospheric nitrogen.
C. The exhaustion of soil nutrients by cotton's fast growth.
D. Cotton feeding in deeper soil layers, leaving surface nutrients for shallow-rooted succeeding crops.

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