Agronomy - Study Mode

[#176] At field capacity the water is held at
Correct Answer

(A) 0.033 MPa

Explanation

Solution: Field capacity is considered as the water content of the soil after two to three days of rain or irrigation process when the extra water has been percolated by gravitational forces to the ground. It can also be called as water holding capacity of the soil. It is normally 0.033 MPa.

[#177] Consider the following physiological stages of wheat. 1. CRI 2. Seedling 3. Tillering 4. Ear emergence The correct sequence of the above physiological stages is
Correct Answer

(B) 2, 1, 3 and 4

Explanation

Solution: Wheat growth can be physiologically divided into several stages: Germination or emergence, tillering, stem elongation, boot, heading, or flowering, and last one grain-fill or ripening. Seedling is the first stage of growth in wheat that occurs after germination and begins when the first true leaves emerge. CRI is the crown root initiation stage that mostly happens 21 days after sowing. Tillering is lateral branches that happen 40 - 45 days after sowing. The heading stage also known as ear emergence stage begins when the ear emerges from the flag leaf sheath and continues until the entire ear has emerged. So, the correct sequence should be seedling, CRI, tillering followed by ear emergence.

[#178] Spikelet Sterility of wheat caused by deficiency of
Correct Answer

(A) Boron

Explanation

Solution: Spikelet sterility in wheat is mainly caused because of deficiency of boron. Some climatic conditions like high humidity and low light intensity due to dense fog also affect the sterility of wheat.

[#179] Rice Ideotype is given by
Correct Answer

(C) Yoshida

Explanation

Solution: The term ideotype was coined by Donald in 1968 which means biological model combining morphological and physiological traits that are thought to enhance genetic yield potential. The ideotype of rice is given by Yoshida.

[#180] Saccharum officinarum is native of
Correct Answer

(A) New Guinea

Explanation

Solution: Saccharum officinarum is one of the most productive and intensively cultivated varieties of sugarcane, originated in New Guinea . It is now cultivated worldwide for the production of sugar, ethanol and other products.