Case Study Questions Class 7 Science Chapter 2 Nutrition in Plants
CBSE Class 7 Case Study Questions Science Nutrition in Plants. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Nutrition in Plants.
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CBSE Case Study Questions Class 7 Science Nutrition in Plants
Case study 1
Carbohydrates,proteins, fats, vitamins and minerals are components of food. These components of food are called nutrients and are necessary for our body.All living organisms require food. Plants can synthesise food for themselves but animals including humans cannot. They get it from plants or animals that eat plants. Thus,humans and animals are directly or indirectly dependent on plants.Plants are the only organisms that can prepare food for themselves by using water, carbon dioxide and minerals.The raw materials are present in their surroundings.The nutrients enable living organisms to build their bodies, to grow, to repair damaged parts of their bodies and provide the energy to carry out life processes. Nutrition is the mode of taking food by an organism and its utilization by the body.
The mode of nutrition in which organisms make food themselves from simple substances is called autotrophic (auto = self; trophos= nourishment) nutrition. Therefore,plants are called autotrophs. Animals and most other organisms take in food prepared by plants. They are called heterotrophs (heteros = other).
Que. 1) What are the components of food?
(a) Vitamins
(b) Carbohydrates
(c) Proteins
(d) All of the above
Que. 2) Which organism are autotrophs?
(a) Humans
(b) Animals
(c) Bacteria
(d) Plants
Que. 3) Plants produce food by using which of the following components.
(a) Water
(b) Carbon dioxide
(c) Starch
(d) Both (a) & (b)
Que. 4) Define autotrophic nutrition?
Que. 5) What are the things enabled by nutrients to living organisms?
Answer Key
Que. 1) (d) All of the above
Que. 2) (d) Plants
Que. 3) (d) Both (a) & (b)
Que. 4) Answer: it is the mode of nutrition in which organisms like plants make food on their own from simple substances.
Que. 5) Answer:nutrients enable the living beings to grow, to build their bodies, to repair damaged parts like tissues of the body and also provide energy to carry out metabolism.
Case study 2
Leaves are the food factories of plants. Therefore, all the raw materials must reach the leaf. Water and minerals present in the soil are absorbed by the roots and transported to the leaves. Carbon dioxide from air is taken in through the tiny pores present on the surface of leaves. These pores are surrounded by ‘guard cells’. Such pores are called stomata.Water and minerals are transported to the leaves by the vessels which run like pipes throughout the root, the stem, the branches and the leaves. They form a continuous path or passage for the nutrients to reach the leaf. They are called vessels. The leaves have a green pigment called chlorophyll. It helps leaves to capture the energy of the sunlight. This energy is used to synthesise (prepare) food from carbon dioxide and water.Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis (Photo: light; synthesis :to combine). So we find that chlorophyll, sunlight, carbon dioxide and water are necessary to carry out the process of photosynthesis. It is a unique process on the earth. The solar energy is captured by the leaves and stored in the plant in the form of food. Thus, sun is the ultimate source of energy for all living organisms.
Que. 1) What are the food factories of plants?
(a) Leaves
(b) Roots
(c) Stem
(d) None of the above
Que. 2) Leaves contain ……………………………………………………………………… pigment.
(a) Chlorophyll
(b) Green pigment
(c) carotenoid
(d) Both (a) & (b)
Que. 3) …………………………………………………………………… is the ultimate source of energy for all living organisms.
(a) Moon
(b) Sun
(c) Infrared light
(d) Visible light
Que. 4) How does the leaves capture the sunlight energy?
Que. 5) Define photosynthesis?
Answer Key
Que. 1) (a) Leaves
Que. 2) (d) Both (a) & (b)
Que. 3) (b) Sun
Que. 4) Answer: leaves capture the sunlight energy with the help of a green pigment called chlorophyll which is present in the mesophyll cells of leaves.
Que. 5)Answer: The process of synthesis of food from carbon dioxide and water in the presence of sunlight is called as photosynthesis.
Case study 3
Plants synthesise carbohydrates through the process of photosynthesis. Thecarbohydrates are made of carbon, hydrogen and oxygen. These are used to synthesise other components of food such as proteins and fats. But proteins are nitrogenous substances which contain nitrogen. Nitrogen is present inabundance in gaseous form in the air.
However, plants cannot absorb nitrogen in this form. Soil has certain bacteria that convert gaseous nitrogen into a usable form and release it into the soil. These are absorbed by the plants along with water. Also, you might have seen farmers adding fertilisers rich in nitrogen to the soil. In this way the plants fulfil their requirements of nitrogen along with the other constituents. Plants can then synthesise proteins and vitamins.
Besides leaves, photosynthesis also takes place in other green parts of the
Plant — in green stems and green branches. The desert plants have scale- orspine-like leaves to reduce loss of water by transpiration. These plants havegreen stems which carry out photosynthesis.
Que. 1) Carbohydrates are made up of which of the following components?
(a) Hydrogen
(b) Carbon
(c) Oxygen
(d) All of the above
Que. 2) …………………………………………………..…… is a nitrogen containing compound.
(a) Carbohydrates
(b) Hydrogen
(c) Oxygen
(d) Proteins
Que. 3) Which organisms convert gaseous nitrogen into a useable form?
(a) Earthworm
(b) Cattle
(c) Microbe
(d) Bacteria
Que. 4) How does desert plants reduce loss of water by transpiration?
Que. 5) How do plants fulfil their requirements of nitrogen?
Answer Key
Que. 1) (d) All of the above
Que. 2) (d) Proteins
Que. 3) (d) Bacteria
Que. 4) Answer: Desert plants have scaly or spiny leaves as compared to other normal plants to reduce water loss by transpiration.
Que. 5) Answer: Certain bacterias present in soil converts gaseous nitrogen into more useable form and release it into soil and also nitrogen containing fertilizers are added to soil to fulfil nitrogen requirement of plants
Case study 4
Oxygen which is essential for the survival of all organisms is produced during photosynthesis. In the absence ofphotosynthesis, life would be impossible on the earth.During photosynthesis, chlorophyll containing cells of leaves, in the presence of sunlight, use carbon dioxide and water to synthesise carbohydrates. The process can be represented in an equation: During the process oxygen is released. The presence of starch in leaves indicates the occurrence of photosynthesis. Starch is also a carbohydrate
Carbon dioxide+ water ——– sunlight——–> carbohydrate+ oxygen
Que. 1) Which of the following organism produces oxygen?
(a) Humans
(b) Plants
(c) Bacteria
(d) Fungi
Que. 2) Photosynthesis occurs in the presence of light?
(a) True
(b) False
(c) Both (a)&(b)
(d) None of the above
Que. 3) ………………………………………………………………… component is essential for the survival of all the living organisms.
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
Que. 4) Write the equation of photosynthesis?
Que. 5) What is the indication of the occurrence of photosynthesis in a plant?
Answer Key
Que. 1) (b) Plants
Que. 2) (a) True
Que. 3) (a) Oxygen
Que. 4) Answer: 6CO2+ 6H2O UV LIGHT C6H1206 + 6O2
Que. 5) Answer: The presence of reserve food material (i.e. Starch) in the leaves of plant indicates the occurrence of photosynthesis.
Case study 5
Take two potted plants of the same kind. Keep one in the dark (or in a black box)for 72 hours and the other in sunlight. Perform iodine test with the leaves of both the plants. Record the results. Now leave the pot which was earlier kept in the dark, in the sunlight for 3 – 4 days and perform the iodine test again on its leaves. Record the observations in a notebook. The leaves other than green also have chlorophyll. The large amount of red, brown and other pigments mask the green color.
Photosynthesis takes place in these leaves also. You often see slimy, green patches in ponds or stagnant water bodies. These are generally formed by the growth of organisms called algae. Algae are green in color because they contain chlorophyll which gives them the green color. Algae can also preparetheir own food by photosynthesis.
Que. 1) For how many hours does the potted plant needs to be kept in dark.
(a) 42 hours
(b) 65 hours
(c) 2 hours
(d) 72 hours
Que. 2) Which colour of leave have the maximum chlorophyll?
(a) Red
(b) Brown
(c) Orange
(d) Green
Que. 3) ……………………………………………………………….. are the slimy green patches in the pond.
(a) Plant
(b) Bacteria
(c) Algae
(d) Fungi
Que. 4) Which organism other than plant can form its own food and through which process?
Que. 5) Give a reason. The formation of green patches form in a pond?
Answer Key
Que. 1) (d) 72 hours
Que. 2) (d) Green
Que. 3) (c) Algae
Que. 4) Answer: Algae is the other organism which can form its own food through a process called photosynthesis
Que. 5) Answer: green patches are formed in the pond due to the uncontrolled growth of algae and algae are green in colour.
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