Home
Class 9
BIOLOGY
The figure shows two crop fields (plots ...

The figure shows two crop fields (plots A and B) have been treated by manures and chemical fertilizers, respectively, keeping other environment factors same. Observe the graph and answer the following question:

(i) Why does plot B shows sudden increase and then gradual decrease in yield ?
(ii) Why is the highest peak in plot A graph slightly delayed?
(iii) What is the reason for the different pattern of the two graphs.

Text Solution

Verified by Experts

Sudden increase: Chemical fertiliser supplies the minerals immediately in good quantity. Gradual decrease: It is due to depletion of nutrients caused by absorption by plants, leaching to lower layers of the soil and killing of decomposer microbes.
Promotional Banner

Topper's Solved these Questions

  • IMPROVEMENT IN FOOD RESOURCES : PLANTS

    CENGAGE BIOLOGY|Exercise CONSOLIDATED EXERCISE (MCQ)|27 Videos

  • IMPROVEMENT IN FOOD RESOURCES : PLANTS

    CENGAGE BIOLOGY|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES|10 Videos

  • IMPROVEMENT IN FOOD RESOURCES : PLANTS

    CENGAGE BIOLOGY|Exercise MANDATORY EXERCISE (Exercise Set II)|20 Videos

  • HEALTH, HYGIENE, AND DISEASES

    CENGAGE BIOLOGY|Exercise CHALLENGING EXERCISE|2 Videos

  • TISSUES

    CENGAGE BIOLOGY|Exercise CHALLENGING EXERCISE|2 Videos

Similar Questions

Explore conceptually related problems

Why are manure and fertilizers used in fields?

Why are manure and fertilizers used in fields ?

Given below is a bar graph showing the heights of five mountain peaks Read the bar graph carefully and answer the following questions Q(i) Which is the highest peak and what is its height (ii) What is the ratio of the heights of the highest peak and the next highest peak (iii) Arrange the heights of the given peaks in descending order

Figure shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions. At which point/s (A, B, or C) in the curve is light a limiting factor?

For a general reaction A to B , plot of concentration of A vs time is given in figure. Answer the following questions on the basis of this graph. (i) what is the order of the reaction? (ii) What is the slope of the curve ? (iii) What are the units of rate constant?

Plot a graph showing variation of current versus voltage for the material Ga.