Tag: need of water

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Questions Related to need of water

Multiple choice need of water transport in plants biology

The vascular tissue that transports food in different parts of plants is

  1. Phloem

  2. Xylem

  3. Blood

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

Blood is absent in plants.

Leaf is where synthesis of food takes place.
The transport tissues in plants are xylem and phloem.

Xylem transports water and minerals from the roots to other parts of plants.
Phloem transports food in different parts of the plants.

So the correct answer is 'Phloem'.

Multiple choice need of water transport in plants biology

Choose the wrongly matched pair w.r.t. pathway of water absorption.


Apoplast pathway Symplast pathway
$(1)$ Involves intercellular spaces and cell wall Involves interconnected protoplasts
$(2)$ Water movement by cytoplasmic streaming Water movement by mass flow
$(3)$ Fast water movement Slow water movement
$(4)$ Occurs in epidermis and cortex Occurs in endodermis

  1. 1

  2. 2

  3. 3

  4. 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Answer is 2.
In symplast - Water movement by cytoplasmic streaming.
In apoplast-Water movement by mass flow. 
Multiple choice need of water transport in plants biology

Select the incorrect statements
(a) Older dying leaves export most of their mineral content to younger leaves
(b) Sulphur and calcium are frequently remobilised from senescing parts
(c) lons are absorbed from the soil by both passive and active transport
(d) A $C _3$ plant loses only half as much water as a $C _4$ plant for the same amount of $CO _2$ fixed

  1. (a), (b) and (c)

  2. Only (a) and (c)

  3. Only (b) and (d)

  4. All except (c)
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice need of water transport in plants biology

Aquaporins are transport channels, which

(I) Are found in both plants and animals
(II) Allow for faster water movement between the cells than osmosis
(III) Allow water molecules to pass during transpiration
(IV) Do not open during drought stress

  1. III and IV

  2. Only II

  3. Only III

  4. I and II
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aquaporins are integral membrane proteins that form pores in the membrane of biological cells, mainly facilitating transport of water between cells. The cell membranes of a variety of different bacteria, fungi, animal and plant cells contain aquaporins through which water can flow more rapidly into and out of the cells than by diffusing through the phospholipid bilayer.  


so the correct option is " I and II'.

Multiple choice need of water transport in plants biology

In plants water moves from ________________.

  1. Less negative to more negative gradient

  2. More negative to less negative gradient

  3. Similar gradient

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

Water potential moves from a region of higher water potential (less negative) to a region of lower water potential (more negative).

Multiple choice need of water transport in plants biology

The passage of water and minerals is confirmly symplast in -

  1. Cortical layers

  2. Epidermis

  3. Endodermis

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

The symplastic pathway involves the movement of water and minerals through the cytoplasm of interconnected plant cells via plasmodesmata. Cortical cells are connected in this way, allowing for symplastic transport.

Multiple choice need of water transport in plants biology

Plant ash indicates.

  1. Organic matter of plant

  2. Mineral salts absorbed by plants

  3. Both mineral salts and organic matter

  4. Silica absorbed by plants
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a plant is burned, organic matter is oxidized and released as gases, leaving behind the inorganic mineral salts that were absorbed from the soil.

Multiple choice need of water transport in plants biology

Which of the following part of a plant absorbs water from the soil?

  1. Stem

  2. Root hairs

  3. Leaves

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

Stems and leaves are a part of the shoot which is present away from the soil .

Root hair are present on the surface of roots which are responsible for the absorption of water and minerals from the soil.
So the correct answer is ' Root hairs'.

Multiple choice need of water transport in plants biology

When the temperature of soil is $0^o$C then.

  1. The absorption of water increases

  2. The absorption of water is not affected by temperature

  3. The absorption of water decreases

  4. The soil will lose capillary water
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice need of water transport in plants biology

The movement of water from one cell of the cortex to the adjacent one in roots is due to _________________.

  1. Water potential gradient

  2. Accumulation of inorganic salts in the cells

  3. Accumulation of organic compounds in the cell

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

Accumulation of solutes in the cells caused the cell to take up water from the surroundings. This is seen when the water is absorbed into the roots from the soil. This is due to the development of chemical gradient (both inorganic and organic solutes may develop a chemical gradient).

When we are considering the movement of water from one cell of the cortex to the adjacent one in the root, it is due to the development of water potential gradient which forces the water to move from one cell to the other.
So the correct answer is ' Water potential gradient'.