Plant Pathology - Study Mode
[#161] Which can preserve food stuff?
Correct Answer
(D) All of these
Explanation
Solution: Sugar and vinegar, Salt and sugar and Vinegar can preserve food stuff. Vinegar may be used to pickle food, a preservation method that extends the shelf life of perishable foods by killing bacteria. Pickling involves soaking a food in a brine solution made from vinegar, water, salt, and sugar, which also changes the food's flavor. Use of salt and sugar curing to prevent microbial growth. Sugar as a preservative by acting as a humectant (maintaining and stabilising the water content in foods) sugar helps to prevent or slow the growth of bacteria, moulds and yeast in food like jam and preserves.
[#162] Green plant do not give out CO 2 during day time because they
Correct Answer
(D) Consume it in photosynthesis
Explanation
Solution: Green plant do not give out CO 2 during day time because they consume it in photosynthesis. During daylight hours, plants take in carbon dioxide and release oxygen through photosynthesis, and at night only about half that carbon is then released through respiration.
Plants typically absorb CO 2 and release oxygen, but they also “exhale” CO 2 , particularly at night, when photosynthesis ceases due to the lack of sunlight.
[#163] Sigmoid curve is depicted by
Correct Answer
(B) Polycyclic
Explanation
Solution: Sigmoid curve is depicted by Polycyclic.
[#164] Movement of pollen tube towards embryo sac is
Correct Answer
(C) Chemotactic
Explanation
Solution: Movement of pollen tube towards embryo sac is Chemotactic. Chemotaxis is a fundamental biological process in which a cell migrates following the direction of a spatial cue. This spatial cue is provided in a form of a gradient of chemoattractants. Chemotactic movement causes the pollen grains to reach the embryo sac and results in fusion, which is also called syngamy. The pollen tube arrives in the micropyle of the integument of the ovule, and enters the embryo sac. The synergids of the embryo sac literally put their energies together to burst the end of the pollen tube.
[#165] Khaira disease in rice is caused due to deficiency of
Correct Answer
(C) Zinc
Explanation
Solution: Khaira disease in rice is caused due to deficiency of Zinc. Khaira disease Of Rice is a micro-nutritional (Zn) deficiency characterized by the presence of dusty brown patches on leaves which ultimately undergo necrosis. This is one of the most common diseases in rice. Treatment of rice seed with 0.4% ZnSO 4 before sowing or of seedlings before transplanting gives control. Spraying with 0.4% ZnSO 4 + 2% urea on the appearance of the symptoms is useful.