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Test: Xylem & Phloem Transport (Old NCERT) - NEET MCQ


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10 Questions MCQ Test Biology Class 11 - Test: Xylem & Phloem Transport (Old NCERT)

Test: Xylem & Phloem Transport (Old NCERT) for NEET 2024 is part of Biology Class 11 preparation. The Test: Xylem & Phloem Transport (Old NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Xylem & Phloem Transport (Old NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Xylem & Phloem Transport (Old NCERT) below.
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Test: Xylem & Phloem Transport (Old NCERT) - Question 1

Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is _______.

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 1

According to transpiration pull theory, due to transpiration, the water column inside the plant comes under tension. This is called 'transpiration puli'. On account of this tension, the water column is pulled up passively from below to top of the plant (almost like a rope). A tension of one atmosphere is sufficient to pull water to a height of about 20 meters.

Test: Xylem & Phloem Transport (Old NCERT) - Question 2

Unidirectional flow of water, minerals, some organic nitrogen and hormones occurs through

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 2

There are two types of vascular tissues in plants, xylem and phloem. Xylem translocation is mainly from roots to aerial parts. It passes water with mineral salts, some organic nitrogen and hormones. Phloem translocates organic substances and some inorganic solutes first from leaves to all other parts of the plant and storage organs. Storage organs re export organic nutrients to those parts which require the same, such as newly formed leaves and fruits.

Test: Xylem & Phloem Transport (Old NCERT) - Question 3

Which of the following statements is incorrect? 

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 3

Cohesion tension theory(Cohesion-tension and transpiration pull theory) explaints the ascent of sap best. It was put forward by Dixon and jolly in 1894.It was further improved by Dixon in 1914. Therefore the theory is alos named after him as Dixon's theory of ascent of sap. Today most of the woekers believe in this theory.

Test: Xylem & Phloem Transport (Old NCERT) - Question 4

The transpiration-driven ascent of xylem sap depends mainly upon ____ property of water.

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 4

There is a continuous column of water from root through the stem and into the leaves. The water column is present in tracheary elements. The column of water does not fall down under the impact of gravity because forces of transpiration provide both energy and necessary pull. Cohesion, adhesion and surface tension keep the water in place.

Test: Xylem & Phloem Transport (Old NCERT) - Question 5

Phloem sap is mainly made of

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 5

Phloem sap consists primarily of water with sugars (sucrose) dissolved in it. It flows from the source or supply end (region of manufacture or storage) to the region of utilisation or sink.

Test: Xylem & Phloem Transport (Old NCERT) - Question 6

The given diagram shows a potato plant forming new tubers.
Which route would be taken by most of the food at this time?

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 6
  • The food is processed in the leaves through which it first travels to the main stem and then is distributed in other parts of the plant.
  • The food reserves are transported to the new tuber maximally and not to the old tubers since old tubers contain adequate food storage. And the brands focus on transferring the food to the newly developing tubers.
Test: Xylem & Phloem Transport (Old NCERT) - Question 7

Read the given statements and select the correct options.
Statement 1: Xylem transport is unidirectional.
Statement 2: Phloem transport is bi-directional.

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 7

Water passage from root hair to xylem and then to other parts is undirectional (unidirectional upwards in xylem). The dirction of movement of organic solutes in phloem can be upwards or downwards i.e. bi-directional.

Test: Xylem & Phloem Transport (Old NCERT) - Question 8

The manufactured food in a green plant moves from the leaves ot other parts through

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 8

The sugars synthesized in leaves (as a result of photosyntesis) are translocated downwards, upwards and laterally to storage organs mainly through phloem. These sugars are translocated in the form of sucrose.

Test: Xylem & Phloem Transport (Old NCERT) - Question 9

Organic substances such as sugars are translocated in the phloem. It can be demonstrated by

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 9

In girdling or ringing experiments (Malpighi,1675), a ring fo bark is cut from the stem. It also removes phloem. Nutrients collect above the ring where the bark also swells up and may give rise to adventitious roots. Growth is also vigorous above the ring The tissues below the ring not only show stoppage of growth but also begin to shrivel Roots can be starved and killed if the ring is not healed after some time. Killing of roots shall kill the whole plant clearly showing that bark or phloem is involved in the movement of organic solutes towards root.

Test: Xylem & Phloem Transport (Old NCERT) - Question 10

Mass flow hypothesis was first described by

Detailed Solution for Test: Xylem & Phloem Transport (Old NCERT) - Question 10

Mass flow or pressure flow hypothesis was put forward by Munch (1927,1930). According to this hypothesis, organic substances move from the region of high osmotic pressure to the region of low osmotic pressure in a mass flow due to the development of a gradient of turgor pressure.

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