Tag: types of transport

Questions Related to types of transport

Which of the following features does all gas exchange have in common?

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. They are enclosed within ribs.

  2. They are maintained at constant temperature.

  3. The exchange surfaces are moist.

  4. They are exposed to air.

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Correct Option: C
Explanation:

Out of all the options given the third option is the correct one.
Exchange of gases is a feature that is common in all living things. Irrespective of the genera of living organisms,  all organs that exchange gases are characterized by features such as- thin, moist, large surface area and a large capillary network.

Correct statement is 

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Roots of plant respire through lenticels and stomata.

  2. Stem of plant respire through lenticels.

  3. Both A and B are correct.

  4. None of the above.

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Correct Option: B
Explanation:

All parts of the plant respire, the leaves, the stem, the roots and even the flowers. The parts above the soil get their oxygen directly from the air through pores. The pores in the leaves are called stomata. The pores in stems of trees are called lenticels.

During night, a person should not sleep under a tree because the tree

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Releases O$ _2$ during night.

  2. Does not release CO$ _2$ during night.

  3. Releases CO$ _2$ during night.

  4. Releases water during guttation.

Show answer
Correct Option: C
Explanation:

Photosynthesis does not take place in plants during night time as the sunlight is absent and the accumulation of carbon dioxide is more. we feel suffocated if we sleep under trees during night times are more carbon dioxide is present around the trees.

So the correct option is 'Releases CO$ _2$ during the night.'

Stomata perform the function of

botany movement in and out of the cell diffusion transport in vascular plants types of transport

  1. Gaseous exchange

  2. Oxygen evolution

  3. Carbon dioxide evolution

  4. $CO _2$ absorption.

Show answer
Correct Option: A
Explanation:
The stomata control gas exchange in the leaf. Each stoma can be open or closed, depending on how turgid its guard cells are. In the light, the guard cells absorb water by osmosis, become turgid and the stoma opens. In the dark, the guard cells lose water, become flaccid and the stoma closes.
So, the correct answer is 'Gaseous exchange'.

Supply ends in transport of solute are

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

  1. Green leaves and storage organs

  2. Root and stem

  3. Xylem and phloem

  4. Hormones and enzymes

Show answer
Correct Option: A
Explanation:

Source and sink are important concepts in translocation in plants. In plants, organic solutes are translocated from regions of their synthesis like green leaves or storage organs like tubers in stem and roots to the region of their active utilisation like the regions of active growth at tips of stem and roots. Thus green leaves and storage organs act as source, whereas regions of active growth act as sink for organic solutes.

Proton pump in thylakoid membrane is :

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

  1. PC

  2. Pheophytin

  3. Fd

  4. PQ

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Correct Option: A

Which region of plants is considered as supply end?

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

  1. Root

  2. Fruit

  3. Leaf

  4. Flower

Show answer
Correct Option: C
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.

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

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

  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

Show answer
Correct Option: C
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.

A and B cells are contiguous. Cell A has OP$=10$ atm, TP $=7$ atm and DPD$=3$atm. Cell B has OP$=8$atm. TP$=3$ atm and DPD$=5$atm. The result would be?

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

  1. No movement of water

  2. Equilibrium between the two

  3. Movement of water from A to B

  4. Movement of water from B to A

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Correct Option: A

Photosynthetic food material is transported in the form of 

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

  1. Glucose

  2. Sucrose

  3. Starch

  4. Fructose

Show answer
Correct Option: B
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.