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Standard XII
Biology
Julius Von Sachs Experiment
The postulati...
Question

The postulations made by Julius Von Sachs were:

A
Production of glucose occurs in the green parts of the plant
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B
Glucose is stored as starch
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C
Chlorophyll is located in special bodies called chloroplasts
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D
All of the above
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Solution

The correct option is D All of the above
In 1854, Julius Von Sachs proved that glucose is produced during the process of photosynthesis in the green parts of the plant. He also found that starch is the storage form of glucose in plants. Furthermore, he showed that chloroplast is the cell organelle that houses the green pigment chlorophyll in plants.

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Q. Copy these sentences in your notebook and complete them.
Leaves carry out photosynthesis..
___________________ is one of the substances required for photosynthesis. It is absorbed by roots and conducted to leaves through a tissue called ____________________. Leaves prepare food in the form of glucose which is stored as __________________. Prepared food is conducted to all parts of the plant body through a tissue known as __________________. Leaves also lose excess ________________ by the process called ________________. Leaves do this through the tiny pores on their surface called _____________________.
Q.

Identify the false statements and rewrite them correctly by changing the first or the last word only.

(a) Dark reaction of photosynthesis occurs during night time.

(b) Immediate product of photosynthesis is glucose.

(c) Starch produced in a leaf remains stored in in for 2-3 weeks before it is used by other parts of the plant.

(d) Photosynthesis requires enzymes.

(e) Green plants are consumers.

(f) Photosynthesis results in loss of dry weight of the plants.

(g) Photosynthesis stops at a temperature of about 35∘C.

(h) Photosynthesis occurs only in cells containing chloroplasts.

(i) Green plants perform photosynthesis.

(j) Algae are autotrophs.

Q.

Fill in the blanks:

(a) Green plants are called __________ since they synthesise their own food.

(b) The food synthesised by plants is stored as __________.

(c) In photosynthesis solar energy is absorbed by the pigment called ___________.

(d) During photosynthesis plants take in ___________and release ___________ gas.

Q. The postulations made by Julius Von Sachs were:
Q. Julius von Sachs observed that
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Julius Von Sachs Experiment
Standard XII Biology
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