Biology

Plant Transport and Physiology

1,834 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 know the plant world closely diversity in plants types of nutrition in plants different modes of nutrition in plants

The roots of ........... plant absorb moisture from the atmosphere.

  1. Rose

  2. Orchid

  3. Banyan

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

The aerial roots of plants absorb moisture from the air. These roots are seen in epiphytes which grow on the surface of other plants.  Epiphytic plants take nutrition from air, rain and surrounding organic debris, as they are not in contact with soil. Orchids are epiphytes which have aerial roots with a modified spongy layer of the epidermis called velamen which can absorb moisture from humid air. The cells of velamen absorb water during rains and store for future.

Option B is correct

Multiple choice botany modes of reproduction introduction to flower pre fertilization - plants sexual reproduction in flowering plants the origin of cells and cell division

What is the function of germ pore?

  1. Emergence of radicle

  2. Absorption of water for seed germination

  3. Initiation of pollen tube

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

One or more thin areas present in the exine of pollen grains are known as germ pores. The germ pores are apertures in the exine layer of the pollen grain where the sporopollenin is absent. The germ pore helps in the formation of the pollen tube and the release of the male gametes during fertilisation. There are usually three germ pores in dicots(tricolpate) and one in monocots(monocolpate).

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Hydrophytes are 

  1. The plants which need more amount of water

  2. The plants which need less amount of water

  3. The plants which grow in water

  4. The plants which do not absorb water
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aquatic plants are plants that have adapted to living in aquatic environments (saltwater or freshwater). They are also referred to as hydrophytes or macrophytes. These plants require special adaptations for living submerged in water, or at the water's surface. The most common adaptation is aerenchyma, but floating leaves and finely dissected leaves are also common. Aquatic plants can only grow in water or in soil that is permanently saturated with water. They are therefore, a common component of wetlands. 

Therefore, the correct answer is option C.

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Which do not have stomata?

  1. Submerged hydrophytes

  2. Hygrophytes

  3. Mesophytes

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

A.Submerged hydrophytes – plants grow completely in the water, stomata are absent.

B.Hygrophytes – plants grow in wet conditions, stomata are present.

C.Mesophytes – plants grow in average climatic conditions. Stomata are present.

D.Xerophytes – plants grow in dry or arid conditions, sunken stomata are present.

So, the correct option is ‘submerged hydrophytes’.

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Which of the following is considered to be the main adaptation for hydrophytes?

  1. Large leaves

  2. Presence of aerenchyma

  3. Weak root system

  4. Roots with root pocket
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In hydrophytes or aquatic plants, large intercellular air spaces are developed extensively in the parenchyma so as to form a connected system throughout the plant. Such a modified parenchymatous tissue is called aerenchyma. It provides buoyancy to the plants and helps in gaseous exchange also. Thus the correct answer is option B.

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Submerged hydrophytes have commonly dissected leaves for

  1. Decreasing surface area

  2. Increasing surface area

  3. Reducing effect of water currents

  4. Increasing number of stomata
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Finely dissected leaves in submerged hydrophytes help reduce the surface area exposed to water currents, preventing the plant from being damaged or uprooted by moving water.

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

Select the correct answers for P and Q :
P. Many organs of aquatic plants float in water
Q. Large air gaps occur in the collenchymatous tissue.

  1. Q is correct, P is wrong

  2. P is correct, Q is wrong

  3. Both P and Q are correct

  4. Both P and Q are wrong
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

P is correct because many aquatic plants have leaves or organs that float. Q is incorrect because air gaps in aquatic plants occur in aerenchyma tissue, not collenchyma.

Multiple choice evs life in water aquatic plant adaptations pollination through water aquatic adaptation extreme adaptations

A continuous system of air passages from aerial leaves to anchored roots is found in

  1. Submerged hydrophytes

  2. Floating hydrophytes

  3. Emergent hydrophytes

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

A continuous system of air passages from leaves to roots is found in emergent hydrophytes because these are the type of plants that keep themselves up from the top of water and these air passages provide buoyancy to it. submerged plants are sinked in water, floating plants are there on the surface of water. suspended hydrophyte are the plants that are just below the surface of water. So the correct answer is ' Emergent hydrophytes '. 

Multiple choice botany energy flow in an ecosystem biogeochemical cycle nutrient cycles species, communities and ecosystems

Plant maintains the balance of ......... in the atmosphere.

  1. Oxygen

  2. Carbon dioxide

  3. Oxygen and Carbon dioxide

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

Photosynthesis is the process in which autotrophs such as green plants use carbon dioxide and water in presence of sunlight to synthesize nutrients such carbohydrates in the form of glucose and release oxygen. Hence oxygen is returned to the atmosphere by photosynthesis. This oxygen from the atmosphere is taken in by animals for carrying out the process of respiration and carbon dioxide is evolved. This carbon dioxide is used by plants and the same cycle continues. Hence plants maintain the balance of oxygen and carbon dioxide in the atmosphere. Thus the correct answer is option C.

Multiple choice business organisation and correspondence industrial pollution and degradation of environment sources of pollution environmental conservation environment and conservation

Floride pollution produces necrosis or chlorosis of

  1. Midrib

  2. Leaf margin and tip

  3. Stem

  4. Petiole but not lamina
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fluoride toxicity in plants typically manifests as necrosis (tissue death) and chlorosis (yellowing) starting at the leaf margins and tips, where fluoride accumulates due to transpiration.

Multiple choice development of plants plant growth growth and development plant growth and development biology

Which of the following makes water a very essential element for growth of plant?

  1. Turgidity of cells helps in extension growth

  2. Water provides the medium for enzymatic activities

  3. Cell enlargement

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

Water is essential in the following ways:-

  1. It carries nutrient to the entire plant.
  2. It maintains the turgidity of the cell.
  3. It maintains the shape of the cell.
  4. About 90% of the plant body is made up of water.
  5. It provides proton in photosynthesis and provides oxygen for respiration.
So the correct option is 'All of the above'.