Skip to content
CNMS ICSE - 7 Std
Share
Explore

Answer in one line

Prepared by: learnloophq@gmail.com

Chapter: 04. Photosynthesis

⁠
What is autotrophic nutrition?
Autotrophic nutrition is the process of nutrition in which organisms take in inorganic substances to synthesize their own organic food.
What are the raw materials required by plants to perform photosynthesis?
The raw materials required by green plants for photosynthesis are carbon dioxide from the air and water from the soil.
What is the primary function of stomata in plant leaves?
Stomata act as passages for carbon dioxide to enter the leaf from the atmosphere and for oxygen to exit the leaf into the atmosphere.
Why are leaves thin, broad, and flat?
Leaves are broad and flat to maximize the surface area exposed to sunlight and to absorb carbon dioxide efficiently.
Where does photosynthesis take place in a plant cell?
Photosynthesis takes place within the chloroplasts, which contain the light-trapping green pigment called chlorophyll.
What is the optimum temperature range for photosynthesis?
The optimum temperature range for the process of photosynthesis is between 20°C and 30°C.
Why does the rate of photosynthesis slow down at temperatures above 40°C?
The rate of photosynthesis slows down at high temperatures because the enzymes involved in the process are proteins and get denatured.
What are the final products formed at the end of the photosynthesis process?
The final products formed during photosynthesis are glucose, which is stored or used as energy, and oxygen, which is released into the atmosphere.
How do plants obtain the nitrogen compounds needed to synthesize proteins from glucose?
Plants absorb dissolved nitrogen compounds from the soil through their roots to synthesize amino acids and proteins.
Why is Sir Jagdish Chandra Bose famous in the field of plant science?
Sir Jagdish Chandra Bose is famous for proving that plants have life, feel pain, and show parallelism to animals, as well as inventing the crescograph.
Why do stomata close at night?
Stomata close at night when there is no light for photosynthesis in order to prevent excess water loss through transpiration.
Why is an aquatic plant like Hydrilla used to demonstrate the evolution of oxygen during photosynthesis?
An aquatic plant like Hydrilla is used because it releases oxygen bubbles directly into the surrounding water, making the gas evolution easy to observe and collect.
How does a researcher test whether a gas collected in a test tube is oxygen?
The gas can be tested by inserting a glowing splinter into the tube, which will burst into a bright flame if oxygen is present.
What are variegated leaves?
Variegated leaves are leaves that contain both green patches with chlorophyll and non-green patches without chlorophyll, such as those of Coleus or Croton.
What is the chemical equation that represents the basic process of photosynthesis?
The chemical equation is: Carbon Dioxide + Water in the presence of Sunlight and Chlorophyll yields Glucose and Oxygen.
Why is solar energy considered the ultimate source of energy for all living beings?
Solar energy is the ultimate source of energy because it is captured by green plants to produce the food and oxygen that sustain all other life forms on Earth.
What is the purpose of keeping a plant in a dark room for 48 hours before starting a photosynthesis experiment?
Keeping the plant in the dark for 48 hours destarches the leaves by forcing the plant to consume its stored starch, making it starch-free for the experiment.
Why are the edges of bell jars sealed with grease in photosynthesis experiments?
The edges of bell jars are sealed with grease to make the experimental setups completely air-tight and prevent external gases from entering.
What happens to the rate of photosynthesis if the carbon dioxide concentration exceeds 0.1% in the air?
If the carbon dioxide concentration exceeds 0.1% in the air, the rate of photosynthesis begins to decrease.
How does the quality of light affect the rate of photosynthesis?
The rate of photosynthesis is highly affected by light quality, being maximum in blue and red light and minimum in green light.
Gallery
 
Want to print your doc?
This is not the way.
Try clicking the ··· in the right corner or using a keyboard shortcut (
CtrlP
) instead.