Tag: simple nutrients into cells

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Questions Related to simple nutrients into cells

Multiple choice botany simple nutrients into cells mineral transport types of transport translocation of organic solutes

Which is the control point in roots where a plant adjust the quantity and quality of solute that reach the xylem:

  1. At root hair cell

  2. At endodermal cell

  3. At pericycle

  4. At cortical cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The plants need to change the sort and amount of solutes that achieve the xylem. The vehicle proteins of endodermal cell help in keeping up and changing solute development. 
So, the correct option is 'At endodermal cell'.
Multiple choice botany simple nutrients into cells mineral transport types of transport translocation of organic solutes

Much of starch is deposited in fruits as it matures. Which of the following explains that how the starch gets there?

  1. Starch solution passes through cells from xylem to fruit.

  2. Starch solution passes through companion cells to fruit.

  3. Starch grains passes through cells from xylem to fruit.

  4. A sugar solution passes through phloem cells to the fruit, where it is changed to starch.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the most widely accepted theory of translocation of organic solutes - 'Mass flow hypothesis' or 'Pressure flow hypothesis', organic substances move in the sieve tubes from the region of higher osmotic concentration to the region of lower osmotic concentration in a mass flow, due to occurrence of a pressure gradient. 

Sucrose is the most commonly translocated sugar. At the source end sucrose is actively uploaded into the sieve tubes with the help of companion cells. At the storage organ / fruit end sucrose is actively downloaded from the sieve tubes and converted to starch for long term storage. 
As starch is tasteless, unripe fruits are tasteless and hard. Subsequently during fruit ripening starch is converted to sugars for utilisation during respiration. Hence, fruits become soft and sweet on ripening.

Multiple choice botany simple nutrients into cells mineral transport types of transport translocation of organic solutes

A scientist associated with work on translocation is

  1. Arnon

  2. Calvin

  3. Dixon

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

'Mass flow hypothesis' or 'Pressure flow hypothesis' to explain translocation was given by Munch, 1930. 

According to this theory organic substances move in the sieve tubes from the region of high osmotic concentration to the region of low osmotic concentration in a mass flow, due to occurrence of pressure gradient. This is the most widely accepted theory to explain translocation in plants.

Multiple choice botany simple nutrients into cells mineral transport types of transport translocation of organic solutes

Translocation of food in higher plants is related to the idea of

  1. Source and sink

  2. Ascent of sap

  3. Diffusion

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

Translocation of organic solutes in phloem is bidirectional. The transport of prepared food is from source to sink. The source is the area, where sugars are present in larger amount either because they are synthesized there, example leaves or are stored there, example storage organs. 

Sink is the region of sugar utilisation. Where ever sugars are present in higher concentration, from there, sugars will be transported to a region, where sugars are required for metabolism or need to be stored. The loading of sugars at source as well as unloading of sugars at the sink both the processes are active and require expenditure of metabolic energy.

Multiple choice botany simple nutrients into cells mineral transport types of transport translocation of organic solutes

Which of the following act as sink?

  1. Root cells

  2. Fruit

  3. Seeds

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

Translocation of organic solutes in phloem is bidirectional. The transport of prepared food is from source to sink. 

The source is the area, where sugars are present in larger amount either because they are synthesized there example leaves sink in the region of sugar utilisation. There is a dynamic balance between source and sink and they also keep on shifting depending on the physiological requirements of the plant. 
In some plants like carrot, radish etc., sugars are stored in roots. 
Hence, in these plants roots serve as sink. 
In most of the plants fruits serve as sink because they store food in epicarp. Seeds store food for the embryo. Seed store food in endosperm or cotyledons. Hence, seeds serve as sink.

Multiple choice cardiac cycle simple nutrients into cells the circulatory system biology

Pacemaker is situated in the

  1. Wall of right atrium

  2. Interauricular septum

  3. Interventricular septum

  4. Wall of left atrium
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The actual structure that serves as the heart's primary pacemaker is called the sinoatrial node (SA node). The SA node is a little bundle of cells located in the wall of the right atrium, the small upper chamber on the right side of the heart.
Thus, the correct answer is 'Wall of right atrium.'

Multiple choice cardiac cycle simple nutrients into cells the circulatory system biology

The pacemaker of heart is

  1. Foramen ovale

  2. Sinoatrial node

  3. Ductus arteriosus

  4. Bundle of His

  5. Vagus nerve
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's“natural pacemaker.”

So, the correct option is 'Sino-atrial node'.

Multiple choice cardiac cycle simple nutrients into cells the circulatory system biology

The heart beat is initiated and regulated by nodal tissue made of specialised cardiac muscles called

  1. Spongy tissue

  2. Purkinje tissue

  3. Alveolar tissue

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

Purkinje tissue is influenced by electrical discharge from the sinoatrial node. During the ventricular contraction portion of the cardiac cycle, the Purkinje fibres carry the contraction impulse from both the left and right bundle branch to the myocardium of the ventricles. In this way these fibres control and initiate heart beat.

So, the correct option is B. ( Purkinje tissue )

Multiple choice cardiac cycle simple nutrients into cells the circulatory system biology

The action potential is conducted from the atria to ventricles by:

  1. Purkinje fibre

  2. SA node and AVN

  3. Bundle of his and SAN

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Sino-atrial node (SA node) is located the right upper corner of the right atrium and AVN(AV node) is located in the lower-left corner of the right atrium close to the atrioventricular septum.
  • The SAN can generate the maximum number of action potentials, i.e., $70-75 min^{–1}$, and is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called the pacemaker. From the SA node, the action potential is conducted from the atria to ventricles by AVN.
  • Hence the action potential is conducted from the atria to ventricles via SA node and AVN.
  • So, the correct answer is 'SA node and AVN'.