Biology

Plant Transport and Physiology

2,012 Questions

Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.

Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots

Plant Transport and Physiology Questions

Multiple choice

Roots take up air from the air spaces present between the

  1. Water

  2. Root hairs

  3. Soil particles

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

Like all other living cells of the plants, the root cells also need oxygen to generate energy. Roots take up air from the air spaces present between the soil particles.

Multiple choice

Typical feature of desert plant is

  1. Loss of lot of water through transpiration

  2. Lose very little water through transpiration

  3. Roots are short

  4. Leaves are broad.

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

Desert plant prevent water loss by less transpiration.

Multiple choice

What is/are the use(s) of air for plants?

  1. The dispersal of seeds

  2. The dispersal of pollen of flowers

  3. Air is a source of Nitrogen for them

  4. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air helps in the dispersal of seeds and pollen of flowers of several plants. Air is not the source of nitrogren for plants which they take from soil alone.

Multiple choice

What is the main function of the roots in aquatic plants?

  1. To absorb nutrients from soil

  2. To absorb water from soil

  3. To hold plant in place

  4. To transport mineral and water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydrilla is an aquatic plant i.e. it lives in water. Function of roots is to fix the plant in the soil and to absorb water from the soil both these requirements get reduced in aquatic plants so hydrilla has got poorly developed roots. Its function is to hold the plant in its place against the water currents.

Multiple choice

Why aquatic plants have narrow and thin ribbon like leaves?

  1. To bind with water flow

  2. To conduct water in tissues

  3. To reduce transpiration

  4. To enhance photosynthesis
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aquatic plants are the plants living in water. These plants have to face the water current that is why their leaves are narrower and ribbon like so as they can easily bend against the water flow without being broken down. Conduction of water is the function of internal xylem tissue and has nothing to do with leaf structure.

Multiple choice

Which kind of movement is not observed in plants?

  1. Water and food transportation

  2. Opening or closing of flower

  3. Movement from one place to another

  4. Stomatal opening or closing another
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plants are the living organisms which stay fixed at one point, do not move as a whole from one place to another rather show differential movement of its parts like leaves, flower etc. food and water are being transported within the pant from one to another part. Flower is closed in the initial stage but opens out when grow fully. Stomata keeps on opening and closing depending upon the requirements.

Multiple choice

Why leaves in desert plants are either absent, very small or leathery?

  1. To reduce transpiration

  2. To reduce sweating

  3. To reduce respiration

  4. To enhance water absorption
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cactus is a plant which grow in deserts. Thus to avoid the loss of excess water through stomata its leaves are reduced to spine like structures and it is the stem in these plants which is green in colour and performs the functions of photosynthesis.

Multiple choice

Why trees in the mountains regions are normally cone shaped and have sloping branches?

  1. To retain water

  2. To slide off snow and rain water

  3. To reduce transpiration

  4. To enhance water conduction
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mountain regions have a lower temperature and have extensive rain fall and snow fall so the trees growing in the mountain regions are adapted to grow there by having cone shaped and sloping branches so that the rain water or snow does not reside over there and get removed itself.

Multiple choice

The main function of sieve tubes is

  1. food conduction

  2. protein transfer

  3. enzyme transfer

  4. transcription
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 Sieve tubes are present in phloem. The main function of sieve tubes is conduction of food.

Multiple choice

Where does ascent of sap take place in xylem of a plant?

  1. In the tracheids with associated xylem parenchyma

  2. In the walls of tracheary element

  3. In xylem parenchyma

  4. In the lumen of tracheary element
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ascent of sap takes place in the lumen of tracheary element in xylem of a plant.

Multiple choice

Which of the following is the main function of xylem vessel?

  1. Mechanical support

  2. Conduction of organic food

  3. Conduction of water and minerals

  4. Prevention of guttation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Conduction of water and minerals is the main function of xylem vessels.Vessel elements are typically found in flowering plants (angiosperms) but absent from most gymnosperms such as conifers. Vessel elements are the main feature distinguishing the "hardwood" of angiosperms from the "softwood" of conifers.

Multiple choice

Which of the following causes hot weather wilting in plants?

  1. Excessive transpiration and reduced absorption

  2. Excessive transpiration and absorption

  3. Reduced transpiration and absorption

  4. Reduced transpiration and excessive absorption
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Excessive transpiration and reduced absorption causes hot weather wilting in plants.