Tag: transport in vascular plants

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Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Proton pump in thylakoid membrane is :

  1. PC

  2. Pheophytin

  3. Fd

  4. PQ
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plastoquinone (PQ) acts as a proton pump in the photosynthetic electron transport chain of the thylakoid membrane. It accepts electrons from Photosystem II along with protons from the stroma, and subsequently releases those protons into the thylakoid lumen.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Which region of plants is considered as supply end?

  1. Root

  2. Fruit

  3. Leaf

  4. Flower
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The translocation of sugars in a plant occurs from source to sink by active loading at source or supply end and active unloading at the sink end. The source and sink are not fixed and keep on changing depending on the physiology of plant. In water transport water is always transported from roots to the aerial parts but not so in case of sugars. 

Sugars are transported from a region, where they are present in high concentration, example leaves to regions of sugar utilisation or storage parts, example storage roots or tubers or fruits etc. 
Thus, storage organs like tubers, roots, fruits etc. serve as sink end and leaves acts as supply end.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Removal of a ring of bark from the trunk of a tree eventually kills it, because

  1. Water can not go up

  2. Fungi and insects attack exposed parts

  3. Food does not travel down and root becomes starved

  4. Air blocks the xylem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In plants sugars are translocated by phloem tissue. This can be experimentally demonstrated by girdling experiments. In girdling experiments all tissues from phloem to epidermis, including secondary phloem are removed. This stops flow of sugars to plant parts below the level of girdle. Thus, the roots are starved and consequently the plant is killed.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Photosynthetic food material is transported in the form of 

  1. Glucose

  2. Sucrose

  3. Starch

  4. Fructose
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants photosynthesize to produce sugars. Sugars are produced as monosaccharides- glucose or fructose. They are transported in the disaccharide form of sucrose through phloem tissue. Sugars are stored as polysaccharides, starch in storage organs.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Factors like plasmolysis, deplasmolysis, root pressure, turgidity, flacidity in plants are responsible for

  1. Absorption of water and minerals in plants

  2. Movement of water and minerals inside roots of the plants

  3. Movement of water and minerals upward in the stem

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The absorption of water and minerals from the soil by the roots of plants and their movement inside roots of the plant and subsequently its upward movement in stem and other aerial parts of the plant body is because of the following phenomenon:-
Imbibition
Diffusion
Osmosis
Osmotic pressure
Root pressure
Turgidity and flacidity
Plasmolysis and deplasmolysis 

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Which of the factor is responsible for absorption and water and minerals in plants ?

  1. Plasmolysis

  2. Turgidity

  3. Osmotic pressure

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The absorption of water and minerals from the soil by the roots of plants and their movement inside roots of the plant and subsequently its upward movement in stem and other aerial parts of the plant body is because of the following phenomenon:-
Imbibition
Diffusion
Osmosis
Osmotic pressure
Root pressure
Turgidity and flacidity
Plasmolysis and deplasmolysis

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Ringing experiment is to show

  1. Translocation of food

  2. Passive absorption

  3. Stomatal opening and closing

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In ringing experiment a complete ring of tissue is removed outside the vascular cylinder at a particular height from ground in a dicot plant. As the xylem is intact water can move freely to the aerial parts from roots. But the sugars cannot move down to roots from aerial parts, because of the removal of phloem tissue, which occurs in the outer cylinder and is removed in ringing experiment. 

A prominent swelling is observed just above the point of removal of ring of tissue due to accumulation of sugars. This experiment proves the respective roles of xylem and phloem in transportation of water and sugars.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

I. Assertion: sugar is translocated to buds for growing them into flowers.
II. Reason:  xylem transport food through the plant.

  1. I and II both are correct and II is correct explanation for I

  2. I is correct and II is incorrect

  3. I and II both are false

  4. I and II both are correct but II is not correct explanation to I
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The increased contents within the cells exert a high amount of pressure on their wall. This pressure moves the food material to the adjacent cells with low pressure. This allows the phloem to move material according to the plants needs.

Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Root pressure theory and cohesion adhesion theory is possible due to _____

  1. Phloem

  2. Xylem trachieds

  3. Parenchymatic tissue

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There are two types of vascular tissues present in the plants viz. Xylem and Phloem. Xylem is responsible for transport of water and some minerals. Phloem is responsible for transport of food and minerals.