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 factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

If a starved plant is provided with glucose the rate of respiration would

  1. Decrease

  2. Increase

  3. Become constant

  4. First rise than fall
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If a starved plant is provided with glucose, the rate of respiration would increase. It is because, carbohydrate is the primary respiratory substrate.

Multiple choice factors affecting respiration living organisms and energy production life processes in living organisms- part 1 respiration biology

The potato growing in hilly areas is bigger in size due to

  1. High rate of photosynthesis at high altitude.

  2. Low rate of respiration at high altitude.

  3. Due to formation of more fat.

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

At high altitudes, the lower temperature reduces the rate of respiration in plants, which means less stored carbohydrate is consumed, allowing more to be stored as starch in tubers like potatoes, leading to larger sizes.

Multiple choice botany plant physiology mechanism of absorption mineral absorption significance of transpiration transport of food, water and minerals mineral transport

Choose the correct answer from the alternatives given.
Minerals enter a plant mainly by:

  1. diffusion

  2. pressure flow

  3. translocation

  4. active transport
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Active transport is a process that is required to move molecules against a concentration gradient. For plants to take up mineral ions, ions are moved into root hairs, where they are in a higher concentration than in the dilute solutions in the soil. So, the correct answer is "Active Transport".

Multiple choice biology adaptation terrestrial adaptations in plants adaptation in terrestrial plants terrestrial adaptation desert ecosystem terrestrial adaptation in animals

Stems are covered by waxy coating in order to prevent

  1. Loss of water

  2. Photosynthesis

  3. Loss of carbon dioxide

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

Stems are covered by waxy coating in order to prevent the loss of water and helps in maintaining the water level in the plant under dry conditions.

Multiple choice biology adaptation terrestrial adaptations in plants adaptation in terrestrial plants terrestrial adaptation desert ecosystem terrestrial adaptation in animals

Stems are modified in cactus in order to perform

  1. Photosynthesis

  2. Digestion

  3. Excretion

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

Stems are modified in cactus in order to perform Photosynthesis. Stems are flattened and green having thick waxy coating over them and helps in performing photosynthesis as leaves are converted into spines.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Chlorosis, i.e., loss of chlorophyll leading to yellowing in leaves, is caused by the deficiency of 

  1. N, K, Mg

  2. S, Fe, Zn

  3. Mn, Mo, Mg

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

Chlorosis is a symptom caused by the deficiency of various essential mineral elements, including Nitrogen, Potassium, Magnesium, Sulfur, Iron, Zinc, Manganese, and Molybdenum, which are all required for chlorophyll synthesis or stability.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Necrosis mainly occurs by the deficiency of  

  1. Ca, Mg

  2. N, S

  3. Mn, Mo

  4. Fe, Mn
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Necrosis, or the death of plant tissue, is commonly caused by the deficiency of minerals like calcium, magnesium, copper, and potassium. Among the choices, calcium and magnesium are well-documented elements whose deficiency leads to localized tissue death.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Premature leaf fall is due to deficiency of 

  1. Sodium

  2. Potassium

  3. Zinc

  4. Phosphorus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Premature leaf fall is a classic symptom of phosphorus deficiency in plants. Phosphorus is mobile within the plant, and its lack disrupts energy transfer and metabolic processes, leading to early senescence and abscission.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Deficiency symptons of nitrogen and potassium are visible first in.

  1. Young leaves

  2. Roots

  3. Buds

  4. Senescent leaves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Nitrogen and potassium are mobile elements within the plant. When they are deficient, the plant translocates these nutrients from older, senescent leaves to younger, growing tissues, causing the deficiency symptoms to appear first in the older leaves.

Multiple choice botany mineral nutrition in plants deficiency diseases and symptoms deficiency symptoms macronutrients and micronutrients

Chlorosis is caused by the deficiency of.

  1. Chlorine and boron

  2. Nitrogen and calcium

  3. Magnesium and iron

  4. Potassium and phosphorus
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorosis is the loss of chlorophyll leading to yellowing of leaves. It is typically caused by deficiencies in essential mineral elements required for chlorophyll synthesis or maintenance, notably magnesium, iron, nitrogen, and potassium, with magnesium and iron being classic primary examples.

Multiple choice biology cell structure animal cell plant and animal cell cell structure and micro-organisms

When waters enters the cell, one of the pressure is exerted on the cell wall  

  1. Osmotic pressure

  2. Suction pressure

  3. Turgor pressure

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

When water enters the cell of a plant cytoplasm and exerts an outward pressure and that pressure is called turgor pressure. A cell wall is rigid and flexible therefore exerts an equal and opposite wall pressure against the expanding protoplasm. Thus, turgor pressure becomes equal to the wall pressure when no exchange of water takes place and equilibrium are established.

Multiple choice biology plants in daily life uses of gymnosperms introduction to gymnosperms importance of plants

The leaves of gymnosperms are well-adapted to withstand extremes of temperature, humidity and wind, because of which of the following features?

  1. Needle like leaves

  2. Thick cuticle

  3. Sunken stomata

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

Conifers have a number of xerophytic characters such as needle-like (e.g., Pinus), scale-like {e.g., Thuja) or small and leathery leaves {e.g., Araucarias), thick cuticle, sclerenchymatous hypodermis and sunken stomata to reduce transpiration. They are, thus, well adapted to tide over the winter period when the soil becomes frozen and availability of water is very little.

So the correct option is D.