NCERT Class VII Science Solutions: Chapter 1-Nutrition in Plants Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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)

Answer:

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)
Column IColumn II
  1. Mango tree
  • Insectivorous plant
  • Mushroom
  • Heterotroph
  • Pitcher plant
  • Autotroph
  • Cuscuta
  • Saprophyte
  • Elephant
  • Parasitic

Answer:

Match the Column I and Column II (A)
Column IColumn II
  1. Mango tree
iii Autotroph
  1. Mushroom
iv Saprophyte
  1. Pitcher plant
i Insectivorous plant
  1. Cuscuta
v Parasitic
  1. Elephant
ii Heterotroph