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Practice each question, then open the answer or worked solution.
How is sulphur important for plants? Name the amino acids in which it
is present.
Sulphur is important for the formation of chlorophyll and the main constituent of various coenzymes. It is also involved in the modulation of legumes. Sulphur is present in two amino acids. Cysteine and Methionine.
How are organisms like Pseudomonas and Thiobacillus of great significance in the nitrogen cycle?
Pseudomonas and Thiobacillus are involved in the process of denitrification during the nitrogen cycle. The nitrate present in the soil is converted
Carefully observe the following figure
a. Name the technique shown in the figure and the scientist who demonstrated this technique for the first time.
b. Name at least three plants for which this technique can be employed for their commercial production.
c. What is the significance of aerating tube and feeding funnel in this setup?
a) The technique shown in the figure is Hydroponics or Soilless culture of a plant.
b) Tomato, Lettuce, Marijuana, Pepper and Cucumber.
c) Aerating tube: A bent tube used for proper aeration of the medium for growth of roots.
Feeding funnel is used for feeding nutrients and water to the medium
Name the most crucial enzyme found in root nodules for N2 fixation? Does it require a special pink coloured pigment for its functioning? Elaborate.
Nitrogenase is the crucial enzyme found in root nodules for N2 fixation it converts the free nitrogen in the air to Ammonia or other nitrogenous compounds. It requires a special pink coloured pigment for its functioning called leg haemoglobin.
How are the terms ‘critical concentration’ and ‘deficient’ different from each other in terms of the concentration of an essential element in plants? How will you find the values of ‘critical concentration’ and ‘deficient’ for minerals – Fe & Zn?
Critical concentration is the concentration of essential elements below which the plant growth would stop whereas the concentration of essential elements below which the deficiency of an element starts taking place and visible signs are seen in deficient.
These values can be found out using Hydropo
Carnivorous plants exhibit nutritional adaptation. Citing an example explain this fact.
Carnivorous plants exhibit nutritional adaptation because they have green leaves which show they are Autotrophic but they grow in nitrogen-deficient soil. In case of Pitcher Plant, it is assumed that during evolution the leaf folded inwards to form the inside of the pitcher
A farmer adds/ supplies Na, Ca, Mg and Fe regularly to his field and yet he observes that the plants show a deficiency of Ca, Mg and Fe. Give a valid reason and suggest a way to help the farmer improve the growth of plants.
The soil becomes infertile when the pH is not maintained. Alkalinity or acidity of the plants when increased they won’t take up nutrients from the soil. It causes iron deficiency also.
Prevention:
The pH of the soil is maintained and using good quality fertilizers.