NCERT Class VII Science Solutions: Chapter 1-Nutrition in plants Part 3

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Question 14:

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

Answer:

Carbohydrates in wheat dough encourage growth of yeast and other saprophytic fungi which break down carbohydrates, and emit a foul smell.

Question 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.

  1. Available In the plant: _____________

  2. Available in the soil: _____________

  3. Available in the air: ______________

  4. Available during day: ______________

Answer:

  1. Available In the plant: chlorophyll

  2. Available in the soil: water, minerals

  3. Available in the air: carbon dioxide

  4. Available during day: sunlight

Question 16:

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

Stomata opening, guard cell

Result for Stomata opening, guard cell (Q)

Stomata Opening, Guard Cell (Q)

Result for Stomata opening, guard cell (Q)

Answer:

Result for Stomata opening, guard cell (A)

Stomata Opening, Guard Cell (A)

Result for Stomata opening, guard cell (A)

LONG ANSWER QUESTIONS

Question 17:

Match the organisms given in Column I with their mode of nutrition given in Column II.

Match the Column I and Column II (Q)
Match the Column I and Column II (Q)

Column I

Column II

Mango tree

Insectivorous plant

Mushroom

Heterotroph

Pitcher plant

Autotroph

Cuscuta

Saprophyte

Elephant

Parasitic

Answer:

Match the Column I and Column II (A)
Match the Column I and Column II (A)

Column I

Column II

Mango tree

iii Autotroph

Mushroom

iv Saprophyte

Pitcher plant

i Insectivorous plant

Cuscuta

v Parasitic

Elephant

ii Heterotroph

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