NCERT Solutions for Class 7 Science Chapter 1

NCERT Solutions for Class 7 Science Chapter 1 Nutrition in Plants in English Medium or अध्याय 1 पादपों में पोषण in हिंदी मीडियम free to view online or download in PDF form updated for new academic session 2020-21.

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NCERT Solutions for Class 7 Science Chapter 1

Class:7
Subject:Science – विज्ञान
Chapter 1:Nutrition in Plants

Class 7 Science Chapter 1 Answers




Important Questions for Practice

1. The term that is used for the mode of nutrition in yeast, mushroom and bread-mould is
(a) autotrophic
(b) insectivorous
(c) saprophytic
(d) parasitic
2. Organisms which prepare food for themselves using simple naturally available raw materials are referred to as
(a) heterotrophs
(b) autotrophs
(c) parasites
(d) saprophytes
3. When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings?
(a) Stomata
(b) Lamina
(c) Midrib
(d) Veins
4. In the absence of which of the following will photosynthesis not occur in leaves?
(a) Guard cells
(b) Chlorophyll
(c) Vacuole
(d) Space between cells
5. 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
(a) saprophyte
(b) parasite
(c) autotroph
(d) symbiosis
6. Which of the following statements is/are correct?
(i) All green plants can prepare their own food.
(ii) Most animals are autotrophs.
(iii) Carbon dioxide is not required for photosynthesis.
(iv) Oxygen is liberated during photosynthesis.
Choose the correct answer from the options below:
(a) (i) and (iv) (b) (ii) only (c) (ii) and (iii) (d) (i) and (ii)
7. Which of the following raw material is available in the air for photosynthesis?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
8. Pitcher plant traps insects because it
(a) is a heterotroph.
(b) grows in soils which lack in nitrogen.
(c) does not have chlorophyll.
(d) has a digestive system like human beings.
9. A goat eats away all the leaves of a small plant (balsam). However, in a few days, new leaves could be seen sprouting in the plant again. How did the plant survive without leaves?
10. 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?




Answers of Important Questions

1 (c)
2 (b)
3 (a)
4 (b)
5 (d)
6 (a)
7 (b)
8 (b)
9. The plant survived on the food stored in the stem and roots.
10. Roots of pulses (leguminous plants) have a symbiotic association with a bacterium called Rhizobium which fixes nitrogen. Hence, farmers need not use nitrogenous fertilizers.



Important NCERT Questions Class 7 Science Chapter 1

जीवों को खाद्य की आवश्यकता क्यों होती है?
सभी जीवों को अपने शरीर के विकास और रखरखाव के लिए ऊर्जा की आवश्यकता होती है। ये ऊर्जा हमें भोजन से प्राप्त होती है।
Distinguish between a parasite and a saprotroph.
Organisms derive nutrition from the body of other living organisms (host) are parasites whereas Plants which derive nutrition from dead and decaying organisms are called saprotrophs.
How would you test the presence of starch in leaves?
Take a potted plant with variegated leaves – for example, money plant or crotons.
Keep the plant in a dark room for three days so that all the starch gets used up.
Now select a leaf cover its portion with a black strip paper and keep the plant in sunlight for about six hours.
Pluck the leaf from the plant. Mark the uncovered area in it and trace them on a sheet of paper.
Dip the leaf in boiling water for a few minutes.
After this, immerse it in a beaker containing alcohol.
Carefully place the above beaker in a water-bath and heat till the alcohol begins to boil.
Now dip the leaf in a dilute solution of iodine for a few minutes.
Take out the leaf and rinse off the iodine solution.
You observe that the presence of starch in various areas of the leaf which was uncovered.
हरे पादपों में खाद्य संश्लेषण प्रक्रम का संक्षिप्त विवरण दीजिए।
पौधों में भोजन का संश्लेषण पत्तियों में होता है इसलिए पत्तियां पौधों की खाद्य फैक्ट्रियां हैं। सभी कच्चे माल (जल, कार्बन डाइऑक्साइड और सूर्य के प्रकाश) को पत्तियों तक पहुंचना चाहिए। पानी और खनिजों को जड़ों द्वारा पत्तियों में ले जाया जाता है। पत्तियों में एक हरा वर्णक होता है जिसे क्लोरोफिल कहा जाता है जो पत्तियों को सूर्य के प्रकाश की ऊर्जा को अब्शोषित करने में मदद करता है। इस ऊर्जा का उपयोग कार्बन डाइऑक्साइड और पानी की उपस्थिति में भोजन तैयार करने के लिए किया जाता है।
रिक्त स्थान की पूर्ति कीजिएः क्योंकि हरे पादप अपना खाद्य स्वयं बनाते हैं, इसलिए उन्हें ______________ कहते हैं।
क्योंकि हरे पादप अपना खाद्य स्वयं बनाते हैं, इसलिए उन्हें स्वपोषी कहते हैं।
रिक्त स्थान की पूर्ति कीजिएः पादपों द्वारा संश्लेषित खाद्य का भंडारण ________________ के रूप में किया जाता है।
पादपों द्वारा संश्लेषित खाद्य का भंडारण मंड (स्टार्च) के रूप में किया जाता है।
Fill in the blank: In photosynthesis solar energy is captured by the pigment called ___________.
In photosynthesis solar energy is captured by the pigment called Chlorophyll.
Fill in the blanks: During photosynthesis plants take in ______________________ and release __________________.
During photosynthesis plants take in carbon dioxide and release oxygen.
Name the following: A parasitic plant with yellow, slender and tubular stem.
A parasitic plant with yellow, slender and tubular stem – Cuscuta

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