Nutrition in Plants - Class 7 - Science
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Extra Questions - Nutrition in Plants | Lakhmir Singh | Science | Class 7
Chiropterophily means:
A) Pollination by bats
B) Pollination by snails
C) Pollination by wind
D) Pollination by insects
The correct answer is Option A: Pollination by bats.
Chiropterophily specifically refers to pollination conducted by bats. To provide further clarity on the options:
Pollination by insects is termed entomophily.
Pollination by wind is known as anemophily.
Pollination by snails is called malacophily.
In plants, xylem conducts water and phloem conducts food.
A) True
B) False
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Sign up nowHumus present in the soil determines the fertility of the soil.
A) True
B) False
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Sign up nowWhich group belongs to $\mathrm{C}_{4}$-plants?
A) Maize, Wheat
B) Maize, Sugarcane
C) Sugarcane, Mustard
D) Maize, Rice
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Sign up nowVery Short Answers - Nutrition in Plants | Lakhmir Singh | Science | Class 7
Name the pores through which leaves exchange gases.
The pores through which leaves exchange gases are called stomata.
Name the process by which plants make food.
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Sign up nowRhizobium bacteria and leguminous plants help each other in survival. What is this relationship known as?
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Sign up nowName any two leguminous plants.
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Sign up nowShort Answers - Nutrition in Plants | Lakhmir Singh | Science | Class 7
Match the items given in column I with those in column II :
Column I | Column II |
---|---|
(i) Chlorophyll | (a) Rhizobium bacteria |
(ii) Nitrogen | (b) Heterotrophs |
(iii) Amarbel | (c) Pitcher plant |
(iv) Animals | (d) Leaf |
(v) Insects | (e) Parasite |
a
Column I | Column II |
---|---|
(i) Chlorophyll | (d) Leaf |
(ii) Nitrogen | (a) Rhizobium bacteria |
(iii) Amarbel | (e) Parasite |
(iv) Animals | (b) Heterotrophs |
(v) Insects | (c) Pitcher plant |
How would you test the presence of starch in leaves?
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Sign up nowWhat are insectivorous plants? Name an insectivorous plant.
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Sign up nowLong Answers - Nutrition in Plants | Lakhmir Singh | Science | Class 7
Give a brief description of the process of synthesis of food in green plants. What is chlorophyll ? What is the role of chlorophyll in photosynthesis?
Green plants synthesize their own food through the process called photosynthesis, wherein they convert carbon dioxide and water into glucose (a simple carbohydrate), utilizing sunlight energy in the presence of chlorophyll. Chlorophyll is a green pigment found in the chloroplasts of plant cells, responsible for the green colour of plants. It plays a crucial role in photosynthesis by absorbing sunlight and using its energy to drive the synthesis of food from carbon dioxide and water. This process not only produces glucose for the plant's own energy requirements but also generates oxygen, which is released into the atmosphere, being essential for living organisms.
(a) How do plants get carbon dioxide for making food by photosynthesis?
(b) Explain how, water and minerals are transported to the leaves of a plant to be used in food making by photosynthesis.
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Sign up nowMCQ - Nutrition in Plants | Lakhmir Singh | Science | Class 7
Which part of the plant gets carbon dioxide from air in photosynthesis ?
(a) root hair
(b) stomata
(c) leaf veins
(d) sepals
The part of the plant that gets carbon dioxide from the air for photosynthesis is the (b) stomata. These are tiny openings or pores in the leaf (and sometimes the stem) surface that allow for gas exchange. Carbon dioxide from the air enters the plant through these stomata, and oxygen produced during photosynthesis is released through them.
Plants take carbon dioxide from the atmosphere mainly through their :
(a) roots
(b) stems
(c) flowers
(d) leaves
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Sign up nowWhich of the following can make its own food ?
(a) giraffe
(b) goat
(c) grass
(d) gorilla
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Sign up nowThe mineral needed by plants to make proteins is :
(a) neon
(b) iodine
(c) nitrogen
(d) calcium
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Sign up nowHOTS - Nutrition in Plants | Lakhmir Singh | Science | Class 7
The leaves of a plant combine a gas A taken from air and a liquid B taken from the soil in the presence of sunlight to make a simple food $C$ by the process called $D$. Some of the simple food $C$ gets converted into a complex food $\mathrm{E}$ which is stored in the various parts of the plant including its leaves.
(a) What are (i) gas A, and (ii) liquid B ?
(b) What are (i) food C, and (ii) food E ?
(c) Name the process D.
(d) Which of the two foods, C or E, will give blue-black colour with dilute iodine solution ?
(e) Name the pigment present in leaves which helps in carrying out the food making process D.
(a) The (i) gas A taken from the air is Carbon dioxide (CO2), and (ii) the liquid B taken from the soil is Water (H2O).
(b) The (i) food C is a simple carbohydrate called Glucose, and (ii) food E refers to a complex carbohydrate known as Starch.
(c) The process D is called Photosynthesis.
(d) The food E (Starch) will give a blue-black colour with a dilute iodine solution.
(e) The pigment present in leaves that helps in carrying out the food-making process D (Photosynthesis) is Chlorophyll.
The plant $X$ is found in abundance in desert areas which get meagre rainfall. The modified leaves of this plant can reduce the loss of water from this plant by transpiration. This plant has long roots which go deep into the soil so as to obtain water.
(a) What could the plant $X$ be ?
(b) Which part/parts of this plant take part in photosynthesis?
(c) How does the photosynthesis in this desert plant differ from those of ordinary plants found in a garden?
(d) What is the colour of the stem of this plant?
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