Tag: transport in plant

Questions Related to transport in plant

Phloem is a type of

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Connective tissue

  2. Vascular tissue

  3. Epidermal tissue

  4. All of the above

Show answer
Correct Option: B
Explanation:

Phloem is a vascular tissue in land plants primarily responsible for the distribution of sugars and nutrients manufactured in the leaves of the plants by the process of photosynthesis.

So, the correct answer is option B.

Phloem tissue is responsible for __________

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Translocation

  2. Transportation

  3. Evaporation

  4. None of these

Show answer
Correct Option: A
Explanation:

Phloem tissue is responsible for translocation, which is the transport of soluble organic substances, for example, sugar. The substances travel along sieve elements, but other types of cells are also present: the companion cells, parenchyma cells, and fibers.

Match the following and choose the correct combination
(A) Endodermis                                (1) Companion cells
(B) Stomata                                      (2) Lenticels
(C) Sieve tube                                  (3) Palisade cells
(D) Periderm                                    (4) Passage cells
(E) Mesophyll                                  (5) Accessory cells

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. A- 4, B - 5, C - 2, D - 1, E - 3

  2. A- 5, B - 3, C - I, D - 2, E - 4

  3. A - 4, B - 5, C - I, D - 2, E - 3

  4. A - 2, B - 5, C - 3, D - 4, E- 1

  5. A - 4, B - 2, C - 5, D - 3, E - 1

Show answer
Correct Option: C
Explanation:

a) Passage cells often occur in the endodermis.

b) Stomata are cells in the epidermis of leaves. It is also called accessory or subsidiary cells.

c) Sieve tubes are related to companion cells and both are portions of plant phloem.

d) Lenticels are spongy openings in the periderm. It helps in gaseous exchange.

e) Mesophyll of a leaf comprises palisade cells that work in the absorption of light for photosynthesis.

Thus the answer is matching "A−4, B−5, C−1, D−2, E−3".

The correct option is C.

Which of the following elements of the phloem is responsible for conducting sugar?

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Companion cells

  2. Parenchyma cells

  3. Sieve tube

  4. None of the above

Show answer
Correct Option: C
Explanation:

The sieve tubes are the conducting vessels in the phloem tissue. These are the long tube like cells which have perforated transverse plates. These are the cells which are responsible for the conduction of food. The sucrose is the main sugar which is the form of carbohydrate stored in the plants. The sugar is transported through the phloem vessels from the source end (leaves) to sink end (roots). 

Thus, the correct answer is option C. 

When strong wind blows, the plants bend down and then again become erect. This flexibility in plants is due to _____________.

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Sclerenchyma

  2. Parenchyma

  3. Collenchyma

  4. Chlorenchyma

Show answer
Correct Option: C
Explanation:

Collenchyma tissue is elastic, extensible and have capacity to expand.

Which of the following is done during ringing experiment

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Bark is removed

  2. Pith is removed

  3. Xylem is removed

  4. All of these

Show answer
Correct Option: D
Explanation:

In ringing experiment, the bark ring is scraped away which also removes the phloem causing xylem exposure. In this experiment, sugar moves downwards in the stem but the movement is stopped by the ring. As as result sugar bulge forms above the ring. This suggest that sugar transports down in the stem in the phloem.

So the answer is D.

Which one dies first when a ring of bark is removed?

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Shoot

  2. Root

  3. None

  4. Both shoot and root die simultaneously

Show answer
Correct Option: B
Explanation:
The total removal of bark is called girdling, so when the bark is removed the roots will die first as they will starve without the sugar production by the leaves transported down.
So, the correct answer is 'Root'.

The loss of which will harm the tree most

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Bark

  2. Half the leaves

  3. Half the branches

  4. All the leaves

Show answer
Correct Option: A
Explanation:
(A) The loss of bark called girdling will eventually lead to the death of the plant.
(B) Loss of half of the leaves will affect the rate of transpiration and the production of starch.
(C) Loss of half of the branches would not affect plant much.
(D) Loss of all of the leaves will either make the new leaf growth or if the plant is weak it will die.
So, the correct answer is 'Bark'.

Loading of phloem means

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Elongation of phloem cells

  2. Separation of phloem parenchyma

  3. Strengthening of phloem fibres

  4. Pouring of sugar into phloem

Show answer
Correct Option: D
Explanation:

Loading of phloem is a process of loading carbon into the phloem for transport to different sinks in a plant. Sinks include metabolism, growth, storage and other processes or organ that need carbon solutes to persist.

So, the correct answer is 'Pouring of sugar into phloem'.

Radioactive tracer studies with $^{14}$C have shown that

biology transport in plant transport in the phloem of plants vascular tissue permanent tissue

  1. Phloem transports organic nutrients

  2. Phloem transports inorganic nutrients

  3. Xylem transports inorganic nutrients

  4. Xylem transports organic nutrients

Show answer
Correct Option: A
Explanation:

The radioactive tracer is a chemical compound used to determine the atoms and molecules by the virtue of radioactive decay. The age of a tree, transportation of solute through phloem etc is seen through the use of radioactive of carbon. 

So, the correct answer is 'Phloem transports organic nutrients'.