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Test: Nutrition in Plants- 3


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20 Questions MCQ Test Science Class 7 | Test: Nutrition in Plants- 3

Test: Nutrition in Plants- 3 for Class 7 2023 is part of Science Class 7 preparation. The Test: Nutrition in Plants- 3 questions and answers have been prepared according to the Class 7 exam syllabus.The Test: Nutrition in Plants- 3 MCQs are made for Class 7 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Nutrition in Plants- 3 below.
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Test: Nutrition in Plants- 3 - Question 1

Which of the following is insectivorous?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 1

Nepenthes species are perennial herbaceous plants and frequently grow in very acidic soil, though some are epiphytes. All the species are carnivorous plants that capture insects and other prey by means of modified pitcher-shaped leaves that function as passive pitfall traps.

Nepenthes rosea - Wikipedia

Test: Nutrition in Plants- 3 - Question 2

Which of the following statements is true about croton plants?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 2

The leaves other than green colour also have chlorophyll. The large amount of other pigments mask the green colour in croton. Photosynthesis takes place in these leaves also.

Test: Nutrition in Plants- 3 - Question 3

Which of the following statement is/are true about photosynthesis?

P - Carbon dioxide is essential for photosynthesis to take place.

Q - The products of photosynthesis are simple sugars.

R - Photosynthesis occurs in the green leaves of plants.

S - Sunlight is not used as an energy source by plants to make food during photosynthesis.

Detailed Solution for Test: Nutrition in Plants- 3 - Question 3

During photosynthesis, chlorophyll containing cells of leaves in the presence of sunlight, use carbon dioxide and water to synthesize carbohydrates.

So option D is correct

Test: Nutrition in Plants- 3 - Question 4

What is the aim of the given experiment? 

 

Detailed Solution for Test: Nutrition in Plants- 3 - Question 4

Sunlight is required for the process of photosynthesis, So the picture depicts sunlight is a basic need of plants.

Test: Nutrition in Plants- 3 - Question 5

The equation given below represents photosynthesis.  Which of the following is represented by X and Y in the given equation?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 5

In the given equation X represents carbon dioxide and Y represents oxygen.

Test: Nutrition in Plants- 3 - Question 6

How does photosynthesis help to maintain the percentage of oxygen and carbon dioxide in the atmosphere?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 6

During photosynthesis, carbon dioxide is used to prepare sugars and oxygen is released into the atmosphere. This helps to maintain the percentage of oxygen at around 21% and that of carbon dioxide at around 0.03% in the atmosphere.

Test: Nutrition in Plants- 3 - Question 7

Which part of the leaf controls the rate of loss of water to the air?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 7

Stomata are the minute epidermal pores in a leaf through which gases or water vapour can pass through.

Test: Nutrition in Plants- 3 - Question 8

What role does the insect play in the insectivorous plant?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 8

The given plant is an insectivorous plant. It captures prey such as, insects, spiders, etc. as a mineral source.

Test: Nutrition in Plants- 3 - Question 9

What is the role of the bacteria in leguminous plants?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 9

Rhizobium Bacteria having symbiotic association with plants, fix 60% of nitrogen gas into soil nitrates.

Test: Nutrition in Plants- 3 - Question 10

Which of the following is true about parasitic plants?  

(i) They absorb food from their host.

(ii) They compete with the host for sunlight.

(iii) They kill the host plant eventually.

Detailed Solution for Test: Nutrition in Plants- 3 - Question 10

A parasitic plant is one that derives some or all of its substances from another plant. They are non-green plants and have a modified root, the haustorium that penetrates the host plant and connects to the xylem, phloem or both.

So option B is correct

Test: Nutrition in Plants- 3 - Question 11

The main mode of nutrition in plants is __________.

Detailed Solution for Test: Nutrition in Plants- 3 - Question 11

The main mode of nutrition in plants is the autotrophic mode of nutrition. Plants have chlorophyll in their leaves which helps them to produce their own food.

Test: Nutrition in Plants- 3 - Question 12

Which of the following types of nutrition is exhibited by the figure given below? 

 

Detailed Solution for Test: Nutrition in Plants- 3 - Question 12

Saprophytic nutrition is a process of chemoheterotrophic extracellular digestion involved in the processing of decayed organic matter.
In saprophytic nutrition the organisms obtain their food from dead and decaying organic matter of dead plants, dead animals and other decomposing organic matter. And the organisms which obtain their food from dead and decaying organic matter of dead plants, dead animals and other organic matter are called saprophytes. Fungi, bread mould, some protists and many bacteria are saprophytic in nutrition.

Test: Nutrition in Plants- 3 - Question 13

Which labelled arrow represents the movement of water? 

Detailed Solution for Test: Nutrition in Plants- 3 - Question 13

P represents solar energy, Q oxygen gas, R CO2 gas and S represents the movement of water from the roots to all parts of the plant body.

Test: Nutrition in Plants- 3 - Question 14

Which of the following words can complete the given table?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 14

Cuscuta is a parasitic plant, nepenthes is insectivorous and mould is saprophytic.

So option C is correct

Test: Nutrition in Plants- 3 - Question 15

Which of the following is the characteristic feature of organisms exhibiting symbiosis?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 15

Symbiosis is a mutually beneficial relationship between two organisms.

Test: Nutrition in Plants- 3 - Question 16

Where does most of the transpiration take place in the given figure?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 16

Stomata are present on the lower side of leaf at part labelled Q. Most of the transpiration takes place at part labelled Q.

Test: Nutrition in Plants- 3 - Question 17

Which structure in a green plant controls the opening and closing of stomata?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 17

Guard cells controls the opening and closing of stomata.

Test: Nutrition in Plants- 3 - Question 18

What is the principal source of energy input to biological systems?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 18

The sun is the ultimate source of energy for all living organisms.

Test: Nutrition in Plants- 3 - Question 19

How does most carbon dioxide reach into the photosynthesizing cells of a green leaf?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 19

Carbon dioxide enters the leaf through stomata by diffusion.

Test: Nutrition in Plants- 3 - Question 20

Which of the following organisms are found as slimy, green patches on ponds or on stagnant water?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 20

Algae are the small green plants, which appears as slimy and green patches in ponds or in stagnant water.

So option D is correct

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