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 evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

The leaves die out early is due to the deficiency of: 

  1. nitrogen

  2. phosphorous

  3. potassium

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

Because of the nitrogen deficiency following things happens:-

1. Plants growth is stunted and poorly developed(because protein content, cell division, and cell enlargement are decreased) 
2. It causes yellowing (chlorosis) of leaves, Older leaves are affected first.
3. Flowering and fruiting are reduced.
4. Protein and starch content is decreased.
5. Prolonged dormancy and early senescence appear.

Multiple choice plant diseases keeping diseases away biology

The disease little leaf of fruit trees is caused by the deficiency of ______________.

  1. Copper

  2. Zinc

  3. Manganese

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

Little leaf of fruit trees is a well-known physiological disorder caused by a deficiency of zinc in the soil and plant tissues. Zinc plays a crucial role in auxin synthesis, which directly affects leaf expansion and internode elongation.

Multiple choice plant diseases keeping diseases away biology

Which one of the following is a disease caused by zinc deficiency?

  1. Die back of rice

  2. Khaira disease of rice

  3. Black heart of potato

  4. Brown spot of rice
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Khaira disease of rice is classically characterized by chlorotic patches that turn brown, caused specifically by a deficiency of zinc. The other listed options correspond to different nutritional disorders or fungal pathogens, such as black heart of potato being caused by oxygen deficiency.

Multiple choice plant diseases keeping diseases away biology

Khaira is a plant disease caused due to the deficiency of

  1. Zinc

  2. Carbon

  3. Iron

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

Zinc sulfate corrects the disorder of the rice plant called as Khaira disease seen in India.

So, the correct option is 'Zinc'.

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

Fixation of $CO _2$ into organic acids during night is a characteristic feature of?

  1. Hydrophytes

  2. Desert succulents

  3. Tropical grasses

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

Desert succulents such as cacti and pineapples utilize Crassulacean Acid Metabolism, fixing carbon dioxide into organic acids during the night when stomata are open to minimize water loss.

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 '.