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 biology water absorption and ascent of sap in plants transport of water across plants habit of plants plant classifications

With reference to the pioneering word done on the plants listed match List(Plants) with List II(Phenomena) and select the correct answer using the codes given the lists.

List-I(Plants) List-II(Phenomena)
a. Sinapis alba $1$. Phototropism
b. Barely roots $2$. Tanda effect
c. Mougetia $3$. Control of gene expression by phytochrome
d. Arabidopsis $4$. Chloroplast movement
  1. A-$1$, B-$2$, C-$4$, D-$3$
  2. A-$1$, B-$4$, C-$2$, C-$3$
  3. A-$3$, B-$2$, C-$4$, D-$1$
  4. A-$3$, B-$4$, C-$2$, D-$1$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sinapis alba relates to phototropism, Barley roots to the Tanda effect, Mougetia to chloroplast movement, and Arabidopsis to phytochrome gene expression. This matches A-1, B-2, C-4, D-3.

Multiple choice biology water absorption and ascent of sap in plants transport of water across plants habit of plants plant classifications

Which of the following statements are not true?

  1. In CAM plants, stomata open during dark and remain closed during the day
  2. Role of $Na^+$ in stomatal opening is now universally accepted

  3. Water potential of root cells is higher than water potential of soil

  4. Capillarity theory is most accepted theory of water movement through plants

  5. Wall of xylem vessels made up of lignocellulose has strong affinity for water molecules
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Soyabean root exports fixed nitrogen as _____ by _____  (respectively).

  1. Ureides; Phloem

  2. Ureides; Xylem

  3. Amides; Phloem

  4. Amino adds; Xylem by
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Soybean and many other legumes fix atmospheric nitrogen into ureides (such as allantoin and allantoic acid) within the root nodules. These fixed nitrogen compounds are then exported to the shoot via the xylem vessels.

Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Read the following four statements:
(A) A simple experiment called girdling was used to identify the tissue through which food is translocated.
(B) Plant factors that effect transpiration include temperature, light, wind velocity and humidity.
(C) Most of the water flow in root occur via apoplast.
(D) In young root, water directly enters into the xylem vessels.
How many of the above statements are right?

  1. Four

  2. Three

  3. Two

  4. One
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice botany root - external morphology root system in plants modifications of root root modifications

Mycorrhizal association controls root affecting pathogens in plants because.

  1. Mychorrhizal fungi colonize the roots and acts as a barrier during infection

  2. Mychorrhizal fungi helps in phosphorus uptake

  3. Mychorrhizal fungi help during stress and shock

  4. Mychorrhizal fungi produce toxins against pathogens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizal fungi form a physical mantle or network around the roots, which acts as a physical barrier against soil-borne pathogens, in addition to aiding in nutrient uptake.

Multiple choice biology photosynthesis and respiration experiments on photosynthesis - light importance of light for photosynthesis photosynthesis necessities- experiments

The phenomenon of response seen in plants towards light is called as 

  1. Phototropism.

  2. Geotropism.

  3. Reflex action.

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

Geotropism (also known as gravitropism) is a turning or growth movement by a plant or fungus in response to gravity. It is a general feature of all higher and many lower plants as well as other organisms. 

Phototropism is the orientation of a plant or other organism in response to light, either toward the source of light (positive phototropism) or away from it (negative phototropism).
A reflex action, differently known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus. Scientific use of the term "reflex" refers to a behavior that is mediated via the reflex arc. 
Spectroscopy is the study of the interaction between matter and electromagnetic radiation. Historically, spectroscopy originated through the study of visible light dispersed according to its wavelength, by a prism. 
So, the correct answer is option A.

Multiple choice biology mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements

In aeroponics, which one of the following absorbs required nutrients to the plant?

  1. Roots

  2. Stem

  3. Leaves

  4. External factors
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Aeroponics is the process of growing plants in an air or mist environment without the use of soil or an aggregate medium. In aeroponics, growing plants are suspended in a closed or semi-closed environment by spraying the plant's roots with an atomized or sprayed, nutrient-rich water solution. 
So the correct option is "roots". 
Multiple choice evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

Which one of the following pairs is NOT correctly matched?

  1. Therophytes - Surviving buds lies well above the soil surface

  2. Cryptophytes - Surviving buds lie under soil surface

  3. Hemicryptophyte - Surviving buds lie on the soil surface

  4. Chemiphytes - Surviving buds lie close or above the soil surface
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Option A is incorrectly matched - Therophytes are annual plants with surviving buds above soil, not 'well above'. Cryptophytes have buds underground, Hemicryptophytes have buds on soil surface, and Chamaephytes have buds at ground level.

Multiple choice biology cell structure plant and animal cell cell structure and micro-organisms organisation of the organism

Dye injected into a plant cell might be able to enter an adjacent cell through _______.

  1. microtubule

  2. microfilament

  3. plasmodesmata

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

Plasmodesmata are cytoplasmic bridges between adjacent plant cells which develop in minute pores of their walls. They form protoplasmic continuum called symplast. It provides channels for controlled passage of small sized particles between adjacent cells as well as transfer of some specific signals.

Multiple choice biology cell structure and micro-organisms plant and animal cell cell structure organisation of the organism

The ................. allows high pressure to build inside of the plant cell without bursting.

  1. Cell wall

  2. Cytoplasm

  3. Nucleus

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

The cell wall allows high pressure to build inside of the plant cell without bursting. The plant cell is able to accept large amounts of liquid through osmosis without bursting. This is due to the presence of cell wall which is absent in the animal cell.

Multiple choice botany option b: biotechnology and bioinformatics dna transfer rdna technology - dna transfer and transformation biotechnology in agriculture

Electroporation is

  1. Making transient pores in cell membranes to introduce gene constructs

  2. Fast passage of nutrients through phloem sieve pores by electric stimulation

  3. Opening of stomata by artificial light during night

  4. Purification of saline water with the help of membrane system
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electroporation is a technique used in molecular biology to create temporary pores in cell membranes using an electrical pulse, allowing foreign DNA or other molecules to enter the cell.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Explain the effect of water scarcity on plants.

  1. In the scarcity of water,the plants become dry and die.

  2. In the scarcity of water,the plants shrink but not die.

  3. In the scarcity of water,the plants become dry and hard.

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

Water is essential for photosynthesis and maintaining turgor pressure in plants; without it, plants wilt, dry out, and eventually die.

Multiple choice chemistry water in our life how can we conserve water? droughts, floods and water conservation conservation of water and its importance and methods

Why plants die due to water scarcity?

  1. Because plants can not survive without water.

  2. Water transport nutrients to other part of plant.

  3. Water is important to carry different processes in plants.

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

Water is essential for plants because it transports nutrients, maintains structure through turgor pressure, and acts as a medium for metabolic processes like photosynthesis.