Chapter 1: Nutrition in Plants

Science

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Chapter 1: Nutrition in Plants

   Class VII 

  Multiple Choice Questions

Question 1

Organisms which prepare food for themselves using simple naturally available raw materials are referred to as

(a) heterotrophs

(b) autotrophs

(c) parasites

(d) saprohytes

Answer

 (b)

Question 2

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

Answer

 (b)

 

Question 3

Which of the following statements is/are correct?

(i) All green plants prepare their own food

(ii) Most animals are autotrophs

(iii) Photosynthesis requires carbon dioxide

(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)

Answer

 (a)

 

Question 4

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

Answer

 (b)

 

Question 5

The term is used for the mode of nutrition in yeast, mushroom and bread-mould is

(a) autotrophic

(b) insectivorous

(c) saprophytic

(d) parasitic

Answer

 (c)

 

Question 6

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

Answer

(a)

 

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 :

(a) autotrophs

(b) saprophytes

(c) symbiosis

(d) parasites

Answer

(d)

Question 8

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

(a) Oxygen

(b) Carbon dioxide

(c) Nitrogen

(d) Hydrogen

Answer

(b)

 

Very Short Answer Questions

 

Question 9

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

 

Answer  

In both potato and ginger, the shoot system and leaves are above ground. Both the shoot system and the leaves 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, ____(a)_________, ____(b)__________.

 

Answer

  (a) carbon dioxide

(b) Sunlight/light energy

 

 

Short Answer Questions

 

 

Question 11

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?

 

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.

(i) RASPAEIT

(ii) ROPEHYTSAP

(iii) TOROPHAUT

(iv) SIBIOMSYS

 

Answer  

(i) PARASITE

 (ii) SAPROPHYTE

(iii) AUTOTROPH

(iv) 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.

 

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.

(a) Available in the plant : _______________

(b) Available in the soil : _______________, _______________

(c) Available in the air : _______________

(d) Available during day : _______________

 

Answer

(a) chlorophyll

(b) water, minerals

(c) carbon dioxide

(d) sunlight

 

 

 

Question 16

Observe the diagram given in the figure below and label the following terms given in the box.

• stomatal opening
• guard cell

Answer

Question 17

Match the organisms given in Column I with their mode of nutrition given in Column II.

 

Answer

(a) (iii);  (b) (iv); (c) (i); (d) (v); (e) (ii)

 

Question 18

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?

Answer

Yes, it is true that these animals do not eat plants. They hunt and eat herbivorous animals like gaur, zebra, deer, bison, giraffe, etc. which are dependent on plants for food. If there are no plants, herbivorous animals will not be able to survive in which case animals like tiger, wolf, lion and leopard will go hungry.

 

Question 19

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) .

Answer  

(a) chlorophyll (b) energy (c) energy (d) photosynthesis (e) carbon dioxide

(f) water (g) food/carbohydrates

 

Question 20

 Spot as many organisms as possible in the puzzle given in the 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.

 

 

Fig 1.2

Answer  

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

 

Question 21

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 and suck your blood which is my food.

(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 parts of plants and animals in the soil.

 

Answer  

(b) fish, heterotroph

(c) mosquito, parasite

(d) mushroom, saprophyte