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

Recalcitrant plants are those which:

  1. withstand reduction in moisture

  2. are killed by freezing temperature

  3. are killed by high temperature

  4. withstand freezing temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Recalcitrant seeds are those that cannot withstand drying or freezing, unlike orthodox seeds which can be dried and stored at low temperatures.

Multiple choice

Why are margins of some leaves wavy?

  1. To effectively drain water from the surface

  2. To help leaf surface to harden, so that less chance of losing water is there from the surface

  3. To shade or insulate the plants that grow them

  4. To provide defence from physical attacks from herbivores and other animals
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Wavy or undulated margins help leaf surface to harden and so, less chance of losing water is there from the surface.

Multiple choice

Out of these, which tissue is involved in transporting water and soluble mineral nutrients from the roots to all the parts of the plant?

  1. Phloem

  2. Xylem

  3. Intercalary

  4. Nervous

  5. Connective tissue

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

Xylem is responsible for the transport of water and soluble mineral nutrients from the roots to all the parts of the plant. Along with that, it is also responsible for replacing water lost during transpiration and photosynthesis.

Multiple choice

The main function of sieve tubes is to

  1. regulate the metabolic activities

  2. give mechanical strength

  3. store compounds

  4. transport organic compounds

  5. store water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phloem complex tissue is composed of sieve tubes, companion cells, phloem fibres and phloem parenchyma. The main function of the seive tube is to transport organic compounds.

Multiple choice

Which of the following statements is correct for xylem?

  1. It is a living cell which lacks nucleus and other organelles.

  2. It transports the nutrients in the downward direction, i.e. from the leaves to the different parts of the plant.

  3. It is also called as sugar-conducting cells.

  4. It is dead with hollow cells and consists of only the cell wall.

  5. It transports the nutrients in the downward direction, i.e. from the root to the stem, leaves and flowers.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

It is dead with hollow cells and consists of only the cell wall.

Multiple choice

Where is stomata located in an isobilateral leaf?

  1. At upper epidermis

  2. At lower epidermis

  3. Both the epidermal layers

  4. No stomata is present in an isobilateral leaf.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stomata is present at both the upper and lower epidermis of a leaf.

Multiple choice

Which of the following statements pertaining to plant structure is incorrect?

  1. Cork lacks stomata, but lenticels carry out transpiration.

  2. The bulliform cells cause rolling of leaves in water-starved conditions.

  3. Casparian strip prevents water and minerals from passively seeping between cells.

  4. Pith is less developed and made of parenchymatous cells in dicots.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cork cells use lenticels for gaseous exchange and not for transpiration.

Multiple choice

The shoot tip of a plant receives water through

  1. water vapours present in the air

  2. vessels and tracheids

  3. tracheids and xylem fibres

  4. vessels and parenchyma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In xylem tissue, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting channels that reach all parts of the plant. 

Multiple choice

Which of the following functions is not performed in the process of transpiration?

  1. Absorption of minerals

  2. Regulation of temperature

  3. Transportation of water

  4. Regulation of the opening and closing of stomata
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transpiration helps in the absorption and upward movement of water from the roots to the leaves. It also helps in temperature regulation. However, it does not play any role in absorption of food.