Question
Pest occur in a severe form in a region or locality at a
particular season or time only.Solution
Occasional pests, a close association with a particular crop is absent and they occur infrequently. Eg: Rice case worm. Persistent pests: Occur on a crop almost throughout the year. Eg: thrips on chilies. Sporadic pests: Occur on a few isolated localities. Eg: coconut slug caterpillar. Epidemic pest: Occur in a severe form in a region or locality at a particular season or time only. Eg: Rice hispa. Endemic pest: Occur regularly and confined mostly to a particular area or locality. Eg: Red hairy caterpillar in groundnut.
The arithmetic means of the following data is.23,17,20,19,21,20,20
A ball is thrown from a height of 900 m on the ground. It bounces (2/3)Â times of its every last bounce. Find the total distance covered by the ball ti...
A spent 36% and 25% of his monthly salary on food and rent, respectively. Of the remaining amount, he gave 25% and 40% to his mother and brother, respec...
The mode and the mean of grouped data are 25 and 29.5 respectively. Find the median, correct to two places of decimal, using empirical relation.
Calculate the mean of these values:
25, 30, 28, 27, 29, 26, 32, 31
The 4th term of an AP is 17 and the 9th term is 42. Find the sum of the first 20 terms.
If the number 9458k2 is divisible by 8, then find the number of possible values of 'k'.
The interest earned when a sum is invested at simple interest of 25% p.a., for 3 years, is Rs. 1875. What will be the total amount received after 2 year...
If p:q = 5:7 and p + q = 408, then find the value of (q - p).
What is the median of the following list of numbers: 5, 3, 6, 9, 11, 19,12,20, and 1?
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