Q1Short answer
Nutrition in Plants
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(b)
Chapter 1 – Nutrition In Plants
Class 7 Science · 21 questions · 21 with answers
Questions
Q2Multiple choice
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
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(b) Chlorophyll
Q3Multiple choice
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)
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(a) (i) and (iv)
Q4Multiple choice
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.
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(b) grows in soils which lack in nitrogen.
Q5Multiple choice
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
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(c) saprophytic
Q6Multiple choice
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
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(a) Stomata
Q7Multiple choice
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
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(d) symbiosis
Q8Multiple choice
Which of the following raw material is available in the air for photosynthesis?
- (a)Oxygen
- (b)Carbon dioxide
- (c)Nitrogen
- (d)Hydrogen
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(b) Carbon dioxide
Q9Very short answer
Potato and ginger are both underground parts that store food. Where is the food prepared in these plants?
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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.
Q10Multiple choice
Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list given below: Water, minerals, _____________, ______________.
- (a)
- (b)
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(a)
(b)
Q11Short answer
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? NUTRITION IN PLANTS 3
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The plant survived on the food stored in the stem and roots.
Q12Multiple choice
Unscramble the following to form terms related to modes of nutrition.
- (i)RASPAEIT
- (ii)ROPEHYTSAP
- (iii)TOROPHAUT
- (iv)SIBIOMSYS
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(i) RASPAEIT
(ii) ROPEHYTSAP
(iii) TOROPHAUT
(iv) SIBIOMSYS
Q13Short answer
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?
Show 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.
Q14Short answer
Wheat dough if left in the open, after a few days, starts to emit a foul smell and becomes unfit for use. Give reason.
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Carbohydrates in wheat dough encourage growth of yeast and other saprophytic fungi which break down carbohydrates, and emit a foul smell.
Q15Multiple choice
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.
- (a)Available in the plant : _______________
- (b)Available in the soil : _______________, _______________
- (c)Available in the air : _______________
- (d)Available during day : _______________
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(a) Available in the plant : _______________
(b) Available in the soil : _______________, _______________
(c) Available in the air : _______________
(d) Available during day : _______________
Q16Short answer
Observe the diagram given as Figure 1.1 and label the following terms given in the box. stomatal opening, guard cell Fig. 1.1
This question refers to a figure in the original PDF.
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ANSWERS 99 LONG ANSWER QUESTIONS
Q17Match the following
Match the organisms given in Column I with their mode of nutrition given in Column II.
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(a) (iii); (b) (iv); (c) (i); (d) (v); (e) (ii)
Q18Long answer
Wild animals like tiger, wolf, lion and leopard do not eat plants. Does this mean that they can survive without plants? Can you provide a suitable explanation?
Show answer
It is true that these animals do not eat plants. They hunt and eat herbivorous animals like deer, gaur, bison, zebra, giraffe, etc. which are dependent on plants for food. If there are no plants, herbivorous animals will not survive in which case animals like tiger, wolf, lion and leopard will have nothing to eat.
Q19Multiple choice
Fill in the blanks of the paragraph given below with the words provided in the box. chlorophyll, energy, food, carbon dioxide, water, photosynthesis Note: A word can be used more than once. Leaves have a green pigment called
- (a)which captures
- (b)from sunlight. This
- (c)is used in the process of
- (d)and along with other raw materials like (e) and (f) synthesize (g) .
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(a) which captures
(b) from sunlight. This
(c) is used in the process of
(d) and along with other raw materials like (e) and (f) synthesize (g) .
Q20Long answer
Spot as many organisms as possible in the puzzle given as Figure 1.2 by encircling them as shown. Write the names on a sheet of paper and categorise them into autotrophs and heterotrophs. Classify the heterotrophs into herbivores, carnivores, omnivores and saprophytes. NUTRITION IN PLANTS 5 Fig. 1.2
This question refers to a figure in the original PDF.
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Number of organisms : 22 (Some examples are given. You may find the rest of the organisms.) Autotrophs – Rose, Mango, Bhindi, Carrot, Banyan, Tulsi, Ginger, Yam Heterotrophs – Elephant, Ant, Yeast, Tiger, Mushroom, Fox, Mice, Owl, Cow, Crow, Rabbit, Bee, Fish Herbivores – Elephant, Cow, Rabbit, Bee Carnivores – Fox, Tiger Omnivores – Ant, Mice, Owl, Crow, Fish Saprophytes – Mushroom, Yeast
Q21Multiple choice
Can you give me a name? Solve each of the following riddles by writing the name of the organism and its mode of nutrition. One riddle is solved to help you.
- (a)I am tall but I cannot move. I am green and can prepare my own food. tree, autotroph
- (b)I live in water; people keep me in an aquarium and feed me. ,
- (c)I am small and I can fly. I disturb your sleep, bite you an d suck y ou r blood which is m y f ood. ,
- (d)I am white and soft. I grow well in the rainy season. Children pluck me from the ground and admire me. I absorb nutrients from decomposed dead p a r t s of plants and animals in the soil. , .
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(b) I live in water; people keep me in an aquarium and feed me. ,
(c) I am small and I can fly. I disturb your sleep, bite you an d suck y ou r blood which is m y f ood. ,
(d) I am white and soft. I grow well in the rainy season. Children pluck me from the ground and admire me. I absorb nutrients from decomposed dead p a r t s of plants and animals in the soil. , .