Tag: diffusion

Quizzes (2) Questions (66)

Questions Related to diffusion

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

Lenticels are associated with

  1. Absorption of moisture

  2. Photosynthesis

  3. Gaseous Exchange

  4. Mineral uptakes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Lenticels act as a pore and provide a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases.
So, the correct option is 'Gaseous Exchange'.
Multiple choice botany movement in and out of the cell diffusion transport in vascular plants types of transport

The waste product of photosynthesis is 

  1. Carbon dioxide

  2. Oxygen

  3. Nitrogen

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

Photosynthesis is the process by which green plants make their own food from carbon dioxide and water in the presence of sunlight. The prepared food is glucose. To prepare one molecule of glucose, by the process of photosynthesis six molecules of carbon dioxide and six molecules of water is required. Six oxygen molecule is released as a waste product. This oxygen is produced due to splitting of water by the process of photolysis during light reaction. So, the correct answer is option 'Oxygen'.

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

In respiration,

  1. Chlorophyll synthesises food from carbon dioxide and water in the presence of sunlight.

  2. Oxygen absorbed from air or water is made to combine with carbon dioxide to produce food.

  3. Chlorophyll absorbs oxygen from air or water and releases carbon dioxide.

  4. Oxygen is absorbed from air or water and made to combine with food and carbon dioxide is released.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In physiology, respiration is defined as the movement of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. The physiological definition of respiration should not be confused with the biochemical definition of respiration, which refers to cellular respiration. The metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide and 38 ATP (energy). Although, physiologic respiration is necessary to sustain cellular respiration and thus life in animals, the processes are distinct: cellular respiration takes place in individual cells of the organism, while physiologic respiration concerns the bulk flow and transport of metabolites between the organism and the external environment. 

Therefore, the correct answer is option D.

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

In which part of the plant, the rate of respiration is higher?

  1. Root and stem tip

  2. Buds

  3. Germinating seeds

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

The highest rate of respiration are found in the actively growing root and stem tips, cambium and embryos of germinating seeds and lowest rates in dormant seeds or spores. As, the growing tips are generally rich in meristematic tissues the rate of respiration is also high.

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Correct statement is 

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

Stomata perform the function of

  1. Gaseous exchange

  2. Oxygen evolution

  3. Carbon dioxide evolution
  4. $CO _2$ absorption.
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.
Multiple choice biology transport in plants diffusion transport in vascular plants types of transport

Supply ends in transport of solute are

  1. Green leaves and storage organs

  2. Root and stem

  3. Xylem and phloem

  4. Hormones and enzymes
Reveal answer Fill a bubble to check yourself
A Correct answer
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.