9th Class Biology Chapter 9 English Medium Online MCQ Test With Answer
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MCQ's Test For Chapter 9 "Plant Physiology"
Try The MCQ's Test For Chapter 9 "Plant Physiology"
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9th Class (English Medium)
Biology (New Book)
Chapter 9
Important MCQ's
Sr.#
Question
Answer
1
When the rate of photosynthesis become equal to that rate of respiration in the plant body. which of the following pattern of gaseous exchange occurs between plaant and its environment.
A. Carbon dioxide is absorbed, and oxygen is released
B. Oxygen is absorbed, and carbon dioxide is released
C. Neither carbon dioxide nor oxygen are absorbed
D. Both carbon dioxide andoxygen are absorbed
2
What is TRUE according to the pressur eflow mechanism of food transport.
A. Water enters the source, creating pressure.
B. Solutes move from low to high concentration
C. Movement of food in pholem is due to gravity
D. Water is pulled from the sink
3
What roles does maganesium play in plants.
A. Aids in water transport
B. Is a component of chlorophyII
C. Promotes early root formation
D. Involved in enzyme functions
4
Which of the following are ways hydrophyes adapt to osmotic condition
A. Developing deep roots
B. Having thick cuticle
C. Producing large leaves
D. Developing sunken stomata
5
What are not the unctions of leaves in plants.
A. Photosynthesis
B. Waste storage
C. Water storage
D. Gas exchange
6
What is the role of companion cells in the translocation process.
A. They stor excess solutes in the phloem
B. they assist in the absorption of water by roots
C. They actively transport sugas into the phloem's sieve tube elements
D. The help regulate water potential in the xylem
7
According to pressur e-flow theory one of the following is not a sink
A. Leaves
B. Fruits
C. Root
D. Stem tubers
8
Which ion plays a role in the opening of stomata.
A. Sodium
B. Potassium
C. Calcium
D. Magnesium
9
Which component is not the part of the plant's vascular system.
A. Stomata
B. Pholem
C. Xylem
D. Root hairs
10
Most of the uptake of water and minerals from soil takes place through.
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