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

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Question 7:

Two organisms are good friends and live together. One provides shelter, water, and nutrients while the other prepares and provides food. Such an association of organisms is termed as

  1. Saprophyte

  2. Parasite

  3. Autotroph

  4. Symbiosis

Answer: D

Question 8:

Which of the following raw material is available in the air for photosynthesis?

  1. Oxygen

  2. Carbon dioxide

  3. Nitrogen

  4. Hydrogen

Answer: B

Image of process of Photosynthesis

Image of Process of Photosynthesis

Image of process of Photosynthesis

VERY SHORT ANSWER QUESTIONS

Question 9:

Potato and ginger arc both underground parts that store food. Where is the food prepared in these plants?

Answer:

In both the plants, shoot system and leaves are above ground. They prepare food through photosynthesis and transport it to the underground parts for storage.

Question 10:

Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below: Water, minerals, ___________, _____________.

Answer:

Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below: Water, minerals, Sunlight/light energy, Carbon dioxide.

SHORT ANSWER QUESTIONS

Question 11:

A goat cats away all the leaves of a small plant (balsam). I however, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?

Answer:

The plant survived on the food stored in the stem and roots.

Question 12:

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

  1. RASPAEIT

  2. ROPEIIYTSAP

  3. TOROPIIAUT

  4. SIBIOMSYS

Answer:

  1. PARASITE

  2. SAPROPHYTE

  3. AUTOTROPH

  4. SYMBIOSIS

Question 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?

Answer:

Roots of pulses (leguminous plants) have a symbiotic association with a bacterium called Rhizobium which fixes nitrogen. Hence, farmers need not use nitrogenous fertilizers.

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