NCERT Class VII Science Solutions: Chapter 1-Nutrition in plants Part 2

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NCERT Class 7 Science Chapter 1: Nutrition in Plants

Question 4:

Give a brief description of the process of synthesis of food in green plants.

Answer:

Leaves are the food factories of plants. The synthesis of food in plants occurs in leaves. Therefore, all the raw materials (Water, Carbon dioxide and sunlight) must reach there. Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves. The leaves have a green pigment called chlorophyll which helps leaves to capture the energy of the sunlight. This energy is used to synthesise (prepare) food from carbon dioxide and water.

As showing in images is a synthesis of food in green plants.

Synthesis of Food in Green Plants

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Question 5:

Show with the help of a sketch that the plants are the ultimate source of food.

Answer:

All the living being depends on plants whether directly or indirectly. For example, the plant eater animals depends directly on plants but carnivore depends indirectly on plants. The following sketch shows some examples of plant dependency.

As showing in images is a result for food chain

Result for Food Chain

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Question 6:

Fill in the blanks:

  1. Green plants are called _________________ since they synthesise their own food.

  2. The food synthesised by the plants is stored as _________________.

  3. In photosynthesis solar energy is captured by the pigment called ___________.

  4. During photosynthesis plants take in ______________________ and release __________________.

Answer:

  1. Green plants are called autotrophs since they synthesise their own food.

  2. The food synthesised by the plants is stored as starch.

  3. In photosynthesis solar energy is captured by the pigment called Chlorophyll.

  4. During photosynthesis plants take in carbon dioxide and release oxygen.

Question 7:

Name the following:

  1. A parasitic plant with yellow, slender and tubular stem.

  2. A plant that has both autotrophic and heterotrophic mode of nutrition.

  3. The pores through which leaves exchange gases.

Answer:

  1. A parasitic plant with yellow, slender and tubular stem – Cuscuta

  2. A plant that has both autotrophic and heterotrophic mode of nutrition - Pitcher plant, Venus flytrap.

  3. The pores through which leaves exchange gases – Stomata