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 botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Trichomes present on the roots are used for

  1. Absorption

  2. Secretion

  3. Transpiration

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

The unicellular hair-like structures present on the surface of the root are known as trichomes. These are finger-like projections of the cells in the regions of the root. The trichomes act like the root hairs. They are involved in the process of absorption of water and minerals from the soil. They also help to increase the surface area for absorption. 

Thus, the correct answer is option A. 

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

 Cuticle is made up of 

  1. Glycerol and hydrocarbon polymers impregnated with wax

  2. Lipid and hydrocarbon polymers impregnated with wax

  3. Fatty acid and hydrocarbon polymers impregnated with wax

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The protective and waxy covering around the epidermis of leaves, young shoots and other aerial parts of a plant is called a cuticle. it is made up of lipid and hydrocarbon polymers integrated with wax. It is formed by the epidermal cells. It acts as the permeability barrier for water soluble substances and water molecules and checks the evaporation of water from the epidermis. So, the correct option is B.
Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

Which of the following represents the functions of veins in the leaves?

  1. Transport of water and minerals

  2. Mechanical support

  3. Transport of organic food material

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

Veins have vascular tissues xylem and phloem. Xylem fulfills the requirement of water of the leaves. Phloem transport food energy to the leaves. They also provide support for the leaf.

So, the correct answer is "  all of these ".

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In a floating leaved plants, stomata occur on

  1. Lower surface

  2. Upper surface

  3. Both of (A) and (B)

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

Stoma (plural stomata) is a pore, found in the epidermis of leaves, stems and other organs that is used to control gas exchange. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the opening.
Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. Monocotyledons, on the other hand, usually have the same number of stomata on the two epidermis.
In plants with floating leaves, stomata may be found only on the upper epidermis and submerged leaves may lack stomata entirely.
Thus, the correct answer is option B. 

Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In a plant where the stomata are absent, some gaseous exchange still takes place through

  1. Aerenchyma

  2. Trichomes

  3. Pneumatophores

  4. Lenticels
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants.
It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. 
Multiple choice botany leaf - external morphology morphology of leaf structure of a leaf the leaf

In floating leaved plants, stomata occur on.

  1. Lower surface

  2. Upper surface

  3. Both surfaces

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

Hydrophytes, in which root system is rooted in the soil and their leaves float on the surface of water. In these leaves, stomata are present on the upper epidermis or surface. Such leaves are called Epistomatous leaves. Eg:Nelumbo, Nympheae.

So, the correct option is ‘Upper surface’.

Multiple choice biology the leaf morphology of leaf structure of a leaf basics of leaf and flower

Main function of leaf is _____.

  1. Transpiration

  2. Exchange of gases

  3. Photosynthesis

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

The main function of leaf is photosynthesis. It produces food for the plant. It has a photosynthetic pigment chlorophyll which converts solar energy into chemical energy. The leaf is also involved in the transpiration process. The transpiration process helps in cooling of plant. The exchanges of gases takes place through stomata present on the leaves.

Thus, the correct answer is 'Photosynthesis.'

Multiple choice evs let's plant trees damaging the forests deforestation and afforestation protecting our environment pollution of soil degradation of land

Plants control the humidity in air by

  1. Photosynthesis

  2. Transpiration

  3. Photorespiration

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

Plants absorb water from the soil and looses it to the atmosphere by transpiration,hence,control the humidity in air by acting as a water exchanger between ground and atmosphere.

Multiple choice biology economic importance of plants and animals uses of angiosperms importance and classification of angiosperms classification of angiosperms importance of plants

Assertion : Vegetable oils are fats, which are present in plant cells in soluble form.

Reason : Vegetable oils only occur in cells of the embryo.


  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion

  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion

  3. If the assertion is true but the reason is false

  4. If both the assertion and reason are false

  5. If the assertion is false but reason is true
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Vegetable oils and fats are present in the form of small insoluble droplets within the plant cells. They occur in the seeds and most commonly in the endosperm and cotyledons. In most of the cereals, the fat occurs in the embryo. 

Olive and palm oils are two important examples that are obtained from the fleshy pericarp of the fruit. Oils and fats are extracted from the roots, stems and foliage very less frequently.
So the correct option is D.

Multiple choice botany reproduction in angiospermic plants artificial vegetative propagation common modes of vegetative propagation vegetative propagation asexual modes of reproduction

Identify the correct statement

  1. Because of marked climatic variations, plants growing near the sea shore do not produce annual rings

  2. The age of the plant can be determined by its height

  3. Grafting is difficult in monocot plants as they have scattered vascular bundles

  4. Healing of damaged tissue is because of activity of sclerenchyma cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Grafting is a horticulture technique where the living detached portion of the plant are used to regenerate the growth. One plant is selected for its roots and this is called the stock or rootstock. The other plant is selected for its stems, leaves, flowers, or fruits and is called the scion. 
Grafting is not possible in monocots as they lack cambium and the joining of vascular tissues between the scion and rootstock donot take place and the vascular bundles are scattered.
So, the correct answer is option C. 
Multiple choice

What is a stomata?

  1. an hole on a plant that allows water or gas to go through

  2. a hole on a plant that allows it to eat

  3. a hole on a plant that allows it to absorb the Sun's energy

  4. an ugly part of a plant
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stomata are tiny openings or pores, usually found on the underside of leaves, that facilitate gas exchange, such as taking in carbon dioxide and releasing oxygen and water vapor.

Multiple choice biology transportation in plants and circulation in animals heart beat cardiac cycle heart, blood vessels and cardiac cycle

In which type of stole, does phloem surround the xylem both externally and internally?

  1. Amphiphloic siphonostele

  2. Ectophtoic siphonostele

  3. Haplostele

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

In an amphiphloic siphonostele, the phloem is found on both the outer and inner sides of the xylem. This is a specific type of vascular arrangement in certain plants.