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Test: Nutrition in Plants- 3 - Class 7 MCQ


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

Test: Nutrition in Plants- 3 for Class 7 2024 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 2024 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 a nutrient?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 1
Nutrients:
Definition:
Nutrients are substances in food that provide energy and essential components for growth, maintenance, and repair of the body.
Examples of nutrients:
- Protein: Proteins are essential for the growth and repair of tissues, as well as for the production of enzymes, hormones, and antibodies.
- Fat: Fats are a concentrated source of energy and are necessary for the absorption of fat-soluble vitamins. They also provide insulation and protection for organs.
- Vitamin: Vitamins are organic compounds required in small amounts for various physiological functions. They play a crucial role in promoting growth, maintaining health, and preventing diseases.
All of these:
All of the options mentioned (protein, fat, and vitamin) are essential nutrients that the body needs for proper functioning. Each nutrient serves a specific purpose and is necessary for overall health and well-being.
In conclusion, the correct answer is All of these (option D) as all the mentioned options are nutrients that provide important functions and benefits to the body.
Test: Nutrition in Plants- 3 - Question 2

Human beings can be categorised as

Detailed Solution for Test: Nutrition in Plants- 3 - Question 2
Heterotrophs:
- Heterotrophs are organisms that cannot produce their own food and rely on consuming other organisms for energy.
- They obtain nutrition by feeding on other living organisms or organic matter.
- Heterotrophs can be further classified into different types based on how they obtain their nutrition.
- Examples of heterotrophs include humans, animals, fungi, and many types of bacteria.
Saprotrophs:
- Saprotrophs are a type of heterotroph that obtain their nutrition by decomposing dead organic matter.
- They secrete enzymes to break down complex organic compounds into simpler forms that can be absorbed and used as nutrients.
- Examples of saprotrophs include fungi and certain bacteria.
Autotrophs:
- Autotrophs are organisms capable of producing their own food using energy from sunlight or inorganic compounds.
- They convert light energy into chemical energy through the process of photosynthesis or chemosynthesis.
- Examples of autotrophs include plants, algae, and some bacteria.
Parasites:
- Parasites are organisms that live on or inside another organism (the host) and obtain their nutrition from the host.
- They derive nutrients from the host without providing any benefit in return.
- Parasites can cause harm or disease to the host organism.
- Examples of parasites include certain types of worms, fleas, ticks, and some bacteria.
In summary, human beings are classified as heterotrophs because they obtain their nutrition by consuming other organisms or organic matter. They are not autotrophs because they cannot produce their own food through photosynthesis or chemosynthesis. Human beings are not saprotrophs either as they do not rely on decomposing dead organic matter for nutrition. While some parasites can affect human health, humans are not considered parasites themselves.
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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 such as glucose.

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

- P - Carbon dioxide is essential for photosynthesis to take place.
- This statement is true. Carbon dioxide is one of the reactants needed for photosynthesis to occur in plants.

- Q - The products of photosynthesis are simple sugars.
- This statement is true. The main products of photosynthesis are simple sugars, such as glucose, that provide energy for the plant.

- R - Photosynthesis occurs in the green leaves of plants.
- This statement is true. Photosynthesis primarily takes place in the chloroplasts of the green leaves of plants, where chlorophyll captures sunlight energy.

- S - Sunlight is not used as an energy source by plants to make food during photosynthesis.
- This statement is false. Sunlight is a crucial energy source for plants during photosynthesis. It is absorbed by chlorophyll and used to convert carbon dioxide and water into glucose and oxygen.

So option D is correct

Test: Nutrition in Plants- 3 - Question 4

Which part of the plant is called its food factory ?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 4
The food factory of a plant is its leaves.
Explanation:
- Leaves are the primary site for photosynthesis, the process by which plants convert sunlight, water, and carbon dioxide into glucose (a type of sugar) and oxygen.
- Photosynthesis occurs in specialized cells called chloroplasts, which are mainly found in the mesophyll tissue of leaves.
- Chloroplasts contain a pigment called chlorophyll that captures sunlight and uses its energy to fuel the photosynthesis process.
- Inside the chloroplasts, carbon dioxide from the air enters through tiny pores called stomata located on the surface of leaves.
- Water is absorbed by the roots and transported to the leaves through specialized tissues called xylem.
- In the presence of sunlight, chlorophyll molecules in the chloroplasts use the energy to split water molecules into hydrogen and oxygen.
- The hydrogen combines with carbon dioxide to form glucose, which is stored as starch or used for energy by the plant.
- Oxygen is released as a byproduct of photosynthesis through the stomata.
- Therefore, leaves are considered the food factory of a plant as they play a crucial role in producing the energy-rich glucose needed for plant growth and development.
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.
Which of the following events occurs during photosynthesis? a. Release  oxygen. b. Net increase in cellular ATP. c. Breakdown of carbohydrates. d.  Production of carbon dioxide. | Homework.Study.com

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

During photosynthesis

Detailed Solution for Test: Nutrition in Plants- 3 - Question 9
During photosynthesis, solar energy is converted into chemical energy. This process takes place in the chloroplasts of plant cells and involves several steps. Here is a detailed explanation:
1. Light Absorption:
- Chlorophyll, a pigment found in chloroplasts, absorbs sunlight.
- The energy from the sunlight is used to excite electrons in the chlorophyll molecules.
2. Light-dependent Reactions:
- Excited electrons are transferred through a series of proteins called the electron transport chain.
- This chain generates ATP (adenosine triphosphate), a molecule that stores energy.
- Water molecules are split, releasing oxygen as a byproduct.
- The electrons from the water molecules replace the excited electrons in the chlorophyll molecules.
3. Calvin Cycle (Light-independent Reactions):
- ATP and the excited electrons produced in the light-dependent reactions are used in the Calvin cycle.
- Carbon dioxide from the atmosphere enters the cycle and combines with the electrons to form glucose.
- Glucose is a carbohydrate that stores chemical energy.
4. Energy Storage:
- Glucose molecules produced during photosynthesis can be used for various purposes in plants.
- They can be stored as starch or converted into other organic molecules.
- The chemical energy stored in glucose can be used for growth, reproduction, or as a source of energy for cellular respiration.
In conclusion, during photosynthesis, solar energy is converted into chemical energy in the form of glucose. This process is essential for plants to produce their own food and release oxygen into the atmosphere.
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 one of the following is a parasite?

Detailed Solution for Test: Nutrition in Plants- 3 - Question 12
Parasite: Cuscuta
Explanation:
- Lichen: Lichen is not a parasite. It is a mutualistic symbiotic association between a fungus and an alga or a cyanobacterium.
- Cuscuta: Cuscuta, also known as dodder, is a parasitic plant that belongs to the family Convolvulaceae. It lacks chlorophyll and cannot produce its own food. Instead, it attaches itself to the host plant and extracts nutrients and water from it.
- Pitcher plant: Pitcher plants are carnivorous plants that obtain nutrients by trapping and digesting insects and other small prey. Although they derive some nutrients from their prey, they are not considered parasites.
- Rhizobium: Rhizobium is a type of bacteria that forms a symbiotic relationship with legume plants. It fixes atmospheric nitrogen and converts it into a form that can be used by the plant. It is not a parasite.
Therefore, the correct answer is B: Cuscuta.
Test: Nutrition in Plants- 3 - Question 13

Which of the following class of organisms belongs to saprotrophs?

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

To determine which class of organisms belongs to saprotrophs, let's examine each option:
A: Bryophytes
- Bryophytes are non-vascular plants like mosses, liverworts, and hornworts.
- They obtain nutrients through absorption from the environment but are not saprotrophs.
B: Algae
- Algae are photosynthetic organisms that can be unicellular or multicellular.
- They produce their own food through photosynthesis and are not saprotrophs.
C: Lichens
- Lichens are symbiotic associations between fungi and algae or cyanobacteria.
- While the fungi component of lichens can be saprotrophic, lichens as a whole are not exclusively saprotrophs.
D: Fungi
- Fungi are the class of organisms that belong to saprotrophs.
- They obtain nutrients by decomposing organic matter and absorbing the breakdown products.
- Examples include mushrooms, molds, and yeasts.
Therefore, the correct answer is option D: Fungi.
Test: Nutrition in Plants- 3 - Question 14

Which of the following is a parasite?

 

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

Parasite: Cuscuta

- Cuscuta: Cuscuta, also known as dodder, is a parasitic plant that lacks chlorophyll and relies on other plants for nutrients. It wraps itself around the host plant and absorbs water and nutrients from it, ultimately weakening or killing the host plant. This makes Cuscuta a parasite.
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

In plants, maximum transpiration takes place through stomata present on the leaves. Lower surface of leaf has more stomata than upper surface. That is why maximum transpiration occurs.

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.
 

  1. The opening and closing of stomata are controlled by specialized cells called guard cells.
  2. The turgor pressure in the guard cells controls the opening and closing of the guard cells.
  3. Stomatal pores open when guard cells enlarge as a result of water absorption and close when guard cells shrink.
  4. The opening and closing of stomata will also depend on factors such as light, temperature, carbon dioxide, and humidity.
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

Most CO2 reach the photosynthesising cells of green leaves through diffusion. Stomata (tiny pores) present of leaf surface and stem facilitates gaseous exchange between the plant cells and the surrounding. CO2 move into the cells through these small pores.

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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