Q: You know that Archimedes burned ships using mirrors.
a) What type of mirrors were used?
b) Which energy was put to use for burning?
c) Mention the principle in this process.
d) Draw a ray diagram showing this principle. (4 marks)
A: a) Archimedes used concave mirrors for burning the ships.
b) Solar energy was put to use for burning.
c) Archimedes focused the image of the Sun on the ships by adjusting
the concave mirrors in such a way that their focus lie on the ships.
d) Ray diagram is shown below.
Q: What are your observations about the effects of Oxidation reactions
in daily life. Can you suggest any preventive measures for them? (4
marks)
A: When some metals are exposed to moisture, acids ... etc., they
tarnish due to oxidation. This is called Corrosion.
Tarnishing of silver ware, green coating on copper are some examples for this.
Corrosion causes damage to car bodies, bridges, iron railings, ships
and to all other objects that are made of metals. Corrosion can be
prevented or at least minimised by shielding the metal surface from
oxygen and moisture. It can be prevented by painting, oiling,
greasing, galvanizing, chrome plating or making alloys.
When fats and oils are oxidized they become rancid. Their smell and
taste change. Rancidity is an oxidation reaction. The spoilage of
these food items can be prevented by adding preservatives like Vitamin
C and Vitamin E. Keeping food in air tight containers helps to slow
down oxidation process.
10th Biology New Syllabus - Experiment Questions on Photosynthesis
When an experiment is given as a question, draw the diagram first and
then label it. Then, write the format of the experiment. Explain your
observations and the inference you obtained at the end. When an
experiment is given as a question, other logical questions will also
be given. You should draw the diagram, write the experiment, and then
answer the additional questions too.For example..
Q. How do you prove that carbon dioxide is necessary for photosynthesis.
a. Why is this experiment called Mohl's half leaf experiment?
b. How do you de-starch a plant?
A: De starching a plant: to de-starch a plant, we need to keep the
plant in dark for about a week.
Aim: To prove that Carbon dioxide is necessary for Photosynthesis
Apparatus required wide mouthed transparent bottle, destarched plant,
potassium hydroxide pellets / potassium hydroxide solution, split
cork.
Procedure: Arrange the apparatus as shown in the figure. Take the wide
mouthed transparent bottle. Put potassium hydroxide pellets /
potassium hydroxide solution
in the bottle. (Potassium hydroxide absorbs carbon dioxide) ★ Insert
split cork in the mouth of the bottle.
Insert one of the leaves of de starched plant (through a split cork)
into transparent bottle containing potassium hydroxide dioxide
pellets/potassium hydroxide
solution. Leave the plant in sunlight. After a few hours, test this
leaf and any other leaf of this plant for starch.
Observation: The leaf that was exposed to the atmospheric air becomes
bluish black, and the one inside the flask containing potassium
hydroxide that absorbs carbon dioxide in the bottle does not become
blue-black.
Inference: This shows that carbon dioxide is necessary for photosynthesis.
a. Name of the experiment is taken from its inventor name. It is
called as Moll's half leaf experiment because Moll has divided the
leaf into two half portions one inside the bottle and other outside.
b. To de-starch a plant, we should keep the plant in dark for about a week.
then label it. Then, write the format of the experiment. Explain your
observations and the inference you obtained at the end. When an
experiment is given as a question, other logical questions will also
be given. You should draw the diagram, write the experiment, and then
answer the additional questions too.For example..
Q. How do you prove that carbon dioxide is necessary for photosynthesis.
a. Why is this experiment called Mohl's half leaf experiment?
b. How do you de-starch a plant?
A: De starching a plant: to de-starch a plant, we need to keep the
plant in dark for about a week.
Aim: To prove that Carbon dioxide is necessary for Photosynthesis
Apparatus required wide mouthed transparent bottle, destarched plant,
potassium hydroxide pellets / potassium hydroxide solution, split
cork.
Procedure: Arrange the apparatus as shown in the figure. Take the wide
mouthed transparent bottle. Put potassium hydroxide pellets /
potassium hydroxide solution
in the bottle. (Potassium hydroxide absorbs carbon dioxide) ★ Insert
split cork in the mouth of the bottle.
Insert one of the leaves of de starched plant (through a split cork)
into transparent bottle containing potassium hydroxide dioxide
pellets/potassium hydroxide
solution. Leave the plant in sunlight. After a few hours, test this
leaf and any other leaf of this plant for starch.
Observation: The leaf that was exposed to the atmospheric air becomes
bluish black, and the one inside the flask containing potassium
hydroxide that absorbs carbon dioxide in the bottle does not become
blue-black.
Inference: This shows that carbon dioxide is necessary for photosynthesis.
a. Name of the experiment is taken from its inventor name. It is
called as Moll's half leaf experiment because Moll has divided the
leaf into two half portions one inside the bottle and other outside.
b. To de-starch a plant, we should keep the plant in dark for about a week.
10th Class Biology - Photosynthesis Important Questions for AP and Telangana Exams
Q: Discuss the mechanism of photosynthesis/ what are the phases of
photosynthesis? Discuss in detail. (AS-1) ( 4 marks)
A: Here, you can write the mechanism of photosynthesis (about both
light and dark reactions). You can write steps involved in the
mechanism of photosynthesis, point wise.
Q: Nikhil observed the mode of nutrition of Amoeba in a microscope. He
also observed how nutrition is obtained in cuscuta. He prepared notes
with diagrams on this concept. Can you compare the nutrition in Amoeba
and Cuscuta with diagrams? (AS-5)
A: Here, you need to discuss about the mode of nutrition in Amoeba and
then in Cuscuta. Then draw relevant diagrams that explain the process
of nutrition. Same type of questions can be asked about nutrition in
algae and fungi. Prepare detailed notes on this.
Q: Parvati listened to her teacher explaining about nutrition in human
beings. She was not concentrating on the health of her alimentary
canal as she ate lot of junk food. After listening to the lesson, she
decided to be healthy. What decisions she might have taken to be
healthy? (AS-6)
A: Here, explain the nutrition in human beings briefly. Then, write on
good food habits and what decisions parvati might have taken to be
healthy.
Q: Dilip is 8 years old. He was diagnosed with a food deficiency
disease. His body parts were swollen and doctor has recognized that
his muscle development is poor. He had fluffy face and dry skin.
Doctor said that his body accumulated water. Can you identify the
disease and recommend measures to treat the disease? (AS-7)
A: Here, you can draw the diagram of the disease. You should write the
name of the disease- kwashiorkor. You should write the reason for the
cause of this disease and measures to take to overcome this disease.
photosynthesis? Discuss in detail. (AS-1) ( 4 marks)
A: Here, you can write the mechanism of photosynthesis (about both
light and dark reactions). You can write steps involved in the
mechanism of photosynthesis, point wise.
Q: Nikhil observed the mode of nutrition of Amoeba in a microscope. He
also observed how nutrition is obtained in cuscuta. He prepared notes
with diagrams on this concept. Can you compare the nutrition in Amoeba
and Cuscuta with diagrams? (AS-5)
A: Here, you need to discuss about the mode of nutrition in Amoeba and
then in Cuscuta. Then draw relevant diagrams that explain the process
of nutrition. Same type of questions can be asked about nutrition in
algae and fungi. Prepare detailed notes on this.
Q: Parvati listened to her teacher explaining about nutrition in human
beings. She was not concentrating on the health of her alimentary
canal as she ate lot of junk food. After listening to the lesson, she
decided to be healthy. What decisions she might have taken to be
healthy? (AS-6)
A: Here, explain the nutrition in human beings briefly. Then, write on
good food habits and what decisions parvati might have taken to be
healthy.
Q: Dilip is 8 years old. He was diagnosed with a food deficiency
disease. His body parts were swollen and doctor has recognized that
his muscle development is poor. He had fluffy face and dry skin.
Doctor said that his body accumulated water. Can you identify the
disease and recommend measures to treat the disease? (AS-7)
A: Here, you can draw the diagram of the disease. You should write the
name of the disease- kwashiorkor. You should write the reason for the
cause of this disease and measures to take to overcome this disease.
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