Plant Pathology - Study Mode
[#226] Chemical which absorbs light energy and changes it to chemical energy is
Correct Answer
(B) Chlorophyll a
Explanation
Solution: A chemical which absorbs light energy and changes it to chemical energy is Chlorophyll a. Chlorophyll a is a specific form of chlorophyll used in oxygenic photosynthesis. It absorbs most energy from wavelengths of violet-blue and orange-red light, and it is a poor absorber of green and near-green portions of the spectrum. Chlorophyll a also transfers resonance energy in the antenna complex, ending in the reaction center where specific chlorophylls P680 and P700 are located.
[#227] Polyembryony occurs in
Correct Answer
(B) Citrus
Explanation
Solution: Polyembryony occurs in Citrus. Citrus exhibits polyembryonic seed development, an apomictic process in which many maternally derived embryos arise from the nucellus surrounding the developing zygotic embryo. Citrus seed storage proteins were used as markers to compare embryogenesis in developing seeds and somatic embryogenesis in vitro.
[#228] In chiropterophily, pollination is performed by
Correct Answer
(A) Bats
Explanation
Solution: In chiropterophily, pollination is performed by Bats. The pollination of plants by bats is called chiropterophily. Plants pollinated by bats often have pale nocturnal flowers. These flowers are often large and bell-shaped, and some bats have evolved specifically to reach the nectar at the bottom of them.
[#229] The rust of linseed and flax can be completely controlled by spray of
Correct Answer
(A) Borax
Explanation
Solution: The rust of linseed and flax can be completely controlled by a spray of Borax. Melampsora lini, while of economic importance as the causal agent of rust disease of flax and linseed. Borax can remove rust from outdoor furniture, household appliances, garden equipment, metal surfaces, and more. Mixed with warm water and lemon juice, Borax becomes a paste. Leave the paste on for at least 20 minutes, then wipe off the rust.
[#230] Iron deficiency starts when it is
Correct Answer
(A) < 55 ppm
Explanation
Solution: Iron deficiency starts when it is < 55 ppm. Iron (Fe) deficiency chlorosis is a major nutritional disorder for crops growing in calcareous soils and causes decreases in vegetative growth as well as marked yield and quality losses. Soil iron concentration is high, but can become unavailable for absorption if soil pH is higher than 6.5.