Q14 of 22 Page 2

Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.

Food left in open for a few days, especially in hot and humid weather, causes growth of Saprophytes and that causes a foul smell.

Saprophytes feed on dead and decaying matter, in solution form.


More from this chapter

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12

Unscramble the following to form terms related to modes of nutrition.

(i) RASPAEIT


(ii) ROPEHYTSAP


(iii) TOROPHAUT


(iv) SIBIOMSYS

 13

Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, Bengal gram, black gram, etc. do not apply nitrogenous fertilizers during cultivation. Why?

 15

Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials. (a) Available in the plant : _______________ (b) Available in the soil : _______________, _______________ (c) Available in the air : _______________ (d) Available during day : _______________

 16

Observe the diagram given as Figure 1.1 and label the following terms given in the box.

stomatal opening, guard cell