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11.Organisms and Populations
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Humus is
A
A mixture of clay sand and loam
B
Heavy soil with mineral salts
C
Organic matter of colloidal size
D
Light soil with lime
Solution
(c)Humus is the upper layer of soil in forest which is rich in organic material.
Standard 12
Biology
Similar Questions
Match the columns :
| Column – $I$ | Column – $II$ |
| $(a)$ Bears | $(i)$ $\quad$ Diapause |
| $(b)$ Snails | $(ii)$ Hibernation |
| $(c)$ Zooplanktons | $(iii)$ Dormancy |
| $(d)$ Seeds | $(iv)$ Aestivation |
medium
medium
Match the following:
| Column $– I$ | Column $- II$ |
| $(a)$ Thrive in wide range of temperature | $(i)$ Eurythermal |
| $(b)$ Tolerant of a wide range of salinities | $(ii)$ Stenothermal |
| $(c)$ Thrive in narrow range of temperature | $(iii)$ Euryhaline |
| $(d)$ Tolerant of a narrow range of salinities | $(iv)$ Stenohaline |
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