Plant Pathology - Study Mode

[#321] The first Indian scientist who collected and identified fungi in India
Correct Answer

(B) K. R. Kirtikar

Explanation

Solution: The first Indian scientist K. R. Kirtikar collected and identified fungi in India. Lieutenant-Colonel Kanhoba Ranchoddas Kirtikar FLS IMS was an army surgeon in British India and an amateur botanist. An early Indian member of the Bombay Natural History Society he had a special interest in medicinal plants. K. R. Kirtikar was the first Indian scientist who collected and identified the fungi in the country. He took an interest in fungi, cryptogams and algae that grow in hot-water springs at Bhiwandi.

[#322] Which pathogen is polyletic in nature?
Correct Answer

(B) Ceratocystis

Explanation

Solution: Ceratocystis pathogen is polyletic in nature. Ceratocystis fimbriata is a fungus and a plant pathogen attacks such diverse plants as the sweet potato. It is a diverse species that attacks a wide variety of annual and perennial plants. Ceratocystis fimbriata produces ascospores, and these spores are found at the top of fruiting bodies known as perithecia. These ascospores enter and infect new plants through wounds on any part of the plant/tuber/etc and are commonly dispersed by insects, wind and equipment. Polylectic refers to an insect that collects pollen from the flowers of a variety of unrelated plants.

[#323] Arrange root hair cell inner, cortical cell and mesophyll cell in ascending order of DPD
Correct Answer

(C) Root hair cell, Cortical cell and Mesophyll cell

Explanation

Solution: The difference between the diffusion pressure of pure solvent and solution is called diffusion pressure deficit (DPD). It is a reduction in the diffusion pressure of the solvent in the solution over its pure state due to the presence of solutes in it and forces opposing diffusion. In ascending order of DPD, it can be arranged as Root hair > Cortical cell > Mesophyll cell.

[#324] Entry of pollen tube through micropyle is
Correct Answer

(C) Porogamy

Explanation

Solution: Entry of pollen tube through micropyle is Porogamy. The property of having the pollen tube in a seed plant enter the ovule by way of the micropyle is termed Progamy.

[#325] Cut Apple turns brown but does not do so if dipped in ascorbic acid solution due to
Correct Answer

(B) Inactivation of polyphenol oxidase

Explanation

Solution: Cut Apple turns brown but does not do so if dipped in an ascorbic acid solution due to the inactivation of polyphenol oxidase. When oxygen is present in cells, polyphenol oxidase enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colourless precursors to brown-coloured secondary products. Ascorbic acid reacts with oxygen before it reacts with polyphenol oxidase, as the oxygen of air reacts with polyphenol oxidase causing the browning of cut apples.