• Root, stem, and leaves - class-VI
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Root, stem, and leaves - class-VI

Description: root, stem, and leaves
Number of Questions: 35
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Tags: the leaf roots and leaves getting to know plants morphology of flowering plants and their function biology life processes in living organism plants: forms and function structure and functions of living organisms -i evs morphology of flowering plants types and parts of plants major activities of living organisms plants: structure and function life processes plants: parts and functions
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The bulliform cells of leaves lose their turgidity during excessive _____________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Assimilation

  2. Transpiration

  3. Photosynthesis

  4. Respiration

Show answer
Correct Option: B
Explanation:

In some grasses(isobilateral leaves), on epidermis, there are some larger, thin walled cells called bulliform cells are present, which in dry condition lose water through transpiration and thus the rolling up of leaves occurs, e.g., in Poa, Agropyron, Amophilla, etc.

How much water a mango tree can transprire during its growing season?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. $350 - 750$ liters/ day

  2. $350 - 1750$ liters/ day

  3. $750 - 3500$ liters/ day

  4. $1750 - 3500$ liters/ day

Show answer
Correct Option: A
Explanation:
Mango tree transpire around 100L of water per day during normal season But this transpiration reaches to 350-750 L /day during is a growing season.
So the correct option is' 350 -750liters /day'.

Meaningful girdling (ringing) experiment can not be performed within sugarcane because

(a) its phloem is situated interior to xylem
(b) its stem surface is covered with worry coating
(c) its vascular bundles are not present in a ring
(d) its stem is thin $13$. Guttation is caused by

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Transpiration

  2. Osmosis/ DPD

  3. Root pressure

  4. Osmotic pressure

Show answer
Correct Option: C
Explanation:
Guttation is the process of loss of water from the surface of leaves in the form of liquid drops. Hydathodes are the openings through which guttation takes place that are present on the margins of leaves. It occurs when root pressure is high and transpiration is low. 
So the correct answer is 'Root pressure'.

In the leaves of strawberry, water appears to be exuded through leaf margins. This is due to the combination of:
i. Adhesion
ii. Root pressure
iii. Transpiration
iv. Guttation.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. i, ii and iii

  2. ii, iii and iv

  3. i, ii and iv

  4. Only i, & iv

Show answer
Correct Option: C
Explanation:
  • Guttation is the process of loss of water from the surface of leaves in the form of liquid drops. Hydathodes are the openings through which guttation takes place that are present on the margins of leaves.
  • Guttation occurs when root pressure is high and transpiration is low. Guttation is frequently seen occurring at night in herbaceous plants growing under conditions of high soil moisture and high atmospheric humidity.
  • Water rises up in the process due to the property of Adhesion.
So, the correct option is 'i, ii and iv'.

Transpiration.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. There are stomata on the leaves of the plants.Through these opening the excess of water is thrown out in the form of water vapors. This process is called transpiration

  2. There are two guard cells around the opening of stomata.They have an external membrane. They control the opening and closing of the stomata.

  3. Also come amount of water is lost due to evaporation from the leaves.

  4. As a result, water level in the epidermal layer of the leaf decrease

  5. To compensate this loss,more water is brought to the leaves through the xylem.

  6. Transpiration thus helps in absorption of water and minerals and their distribution to all parts of the plant

  7. Root pressure pushes the water up during the night time.

Show answer
Correct Option: A

The droplets of water arranged at the edges of leaves of roses in the morning are

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Water drops condensed from the atmosphere during night at low temperatures

  2. Water transpired from the stomata and lenticels

  3. Water produced on the leaves from the reaction of hydrogen and atmospheric oxygen

  4. None of the above

Show answer
Correct Option: B
Explanation:
Water droplets formed on the edge, tip, or the underside of leaves is not dew because dew comes from water condensing from the air and tends to settle evenly on the leaf’s upper surface.
Transpiration is the evaporative loss of water by plant. When the soil is too wet, water penetrates the plant through its roots and this creates pressure that forces the water to exit the plant in the form of droplets. This process doesn’t occur during the day, because the leaf’s stomata are open at that time. It occurs when the stomata close down, i.e. at night and water pressure begins to build up. Therefore, the droplets can be noticed when the sun comes up in the morning, before the drops evaporate.
So, the answer is B.

Transpiration is mainly a process of ______________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Imbibition

  2. Respiration

  3. Osmotic pressure

  4. Diffusion

Show answer
Correct Option: D

Wilting occurs when there is ___________________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Transpiration higher than absorption

  2. Absorption higher than transpiration

  3. Higher relative humidity of atmosphere

  4. Excess root pressure

Show answer
Correct Option: A

The process of loss of water through the leaves and stem is called

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Transpiration

  2. Respiration

  3. Photosynthesis

  4. Pollination

Show answer
Correct Option: A
Explanation:

Transpiration is the processin which water vapours are released from stomata.

Respiration is a metabolic processes which breaks down complex organic molecules to release energy.
Photosynthesis is the synthesis of sugar in the presence of sunlight, carbon dioxide and water.
Pollination is the transfer of pollen from male organ to female organ of a flower. 
So the correct answer is 'Transpiration'.

In transpiration, water is lost in         form whereas in guttation water is lost in the form of          

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Vapour, liquid

  2. Liquid, vapour

  3. Solid, vapour

  4. Vapour, solid

Show answer
Correct Option: A
Explanation:

In transpiration water is lost in the form of vapour whereas in guttation water in the form of liquid is lost. The loss of water in transpiration is through stomata whereas in guttation, it occurs through hydathodes.

The process by which plants lose water from leaves by evaporation is called as

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Respiration

  2. Photosynthesis

  3. Transpiration

  4. Absorption

Show answer
Correct Option: C
Explanation:

Transpiration is the process of release of water vapour from the stomata. 

Respiration is the process of breakdown of organic compounds to release energy.
Photosynthesis is the process of synthesis of food from inorganic compounds like carbon dioxide and water and sunlight.
Absorption is the uptake of substances into a system like absorption of water by the roots.
So the correct answer is ' Transpiration'.

Transpiration takes place maximum through which of the following structures in plants?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Flowers

  2. Stem

  3. Leaves

  4. Roots

Show answer
Correct Option: C
Explanation:

Transpiration is the process of release of water vapour from the stomata.

The stomata are present on the leaves.
Their are other types of transpiration but 90% of it takes place through Stomata.
So the the correct answer is 'Leaves'.

Potometer works on the principle of -

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Potential difference between the tip of the

    tube and that of the plant

  2. Amount of water absorbed equals the amount

    transpired

  3. Osmotic pressure

  4. Root pressure

Show answer
Correct Option: B
Explanation:
A potometer is also known as transpirometer, is a device used for measuring the rate of water uptake of a leafy shoot which is almost equal to the water lost through the transpiration. The causes of water absorption are photosynthesis and transpiration.
So, the correct answer is 'Amount of water absorbed is equal to the amount transpired'.

Transpiration is best defined as

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. loss of water from the plant

  2. loss of water as vapour from the plant

  3. evaporation of water from the surface of leaves

  4. None of the above

Show answer
Correct Option: C
Explanation:

Transpiration is defined as the evaporation of water from plants, especially leaves. It occurs through leaves and other parts of the plant. It happens through leaves while their stomata remains open for the passage of CO2 and O2 during photosynthesis.

So, the answer is option C.


During transpiration, the leaves lose more water from their upper surface.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

During transpiration water is lost from the upper surface of the leaves because the upper surface is being more exposed to the sun and will tend more loss of water.

Hence. the given statement is 'True'

State whether the following statements are True or False. Rewrite the false statements correctly.
Transpiration is the loss of water from the roots of the plant.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

Transpiration is the loss of water in the form of water vapours from aerial parts of the plant such as stems, leaves and flowers. 

Hence, the given statement is 'False'.

Which of the following plants do not transpire?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Algae

  2. Fungi

  3. Submerged hydrophytes

  4. All of the above

Show answer
Correct Option: D

The stem of the plant when cut and dipped in the water helps in the transport of 

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Water

  2. Minerals

  3. Food

  4. All of the above

Show answer
Correct Option: D
Explanation:

Stem contains special complex permanent tissues called xylem. The xylem helps in the conduction and transportation of water in one direction that is from stem to leaves. 

So the correct option is 'Water and minerals'.

The plants with weak stem growing by spreading on the ground are 

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Creepers

  2. Runners

  3. Climbers

  4. None of the above

Show answer
Correct Option: A
Explanation:

  1. Creeper is considered to be the plant that grows along the ground, by means of extending stem or branches and produce fiber-like roots that arise from the base of the stem and such weak stem are called prostrate stem.
  2. Runners are the stem that grows on the ground that forms adventitious roots and able to give rise to a new plant.
  3. Climbers are the plants that climb up other plant or object by the help of tendrils.
So the correct option is 'Creepers'

The water and minerals are conducted by the stem to which part/s of the plant?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Leaves

  2. Flowers

  3. Buds

  4. All of the above

Show answer
Correct Option: D
Explanation:
Stem conducts the water and minerals from the root at the site of absorption to the leaves and other parts of a plant with the help of vascular bundles called xylem.
So, the correct option is 'All of the above'

The stem was cut and dipped in water and red ink and colour of the leaves became red due to 

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. The absorption of red ink by the leaves from the water

  2. The conduction of water and ink by the stem

  3. The loss of green colour from the leaves

  4. None of the above

Show answer
Correct Option: B
Explanation:

This experiment is done to check the movement of water in stem in which ink is mixed with water and the stem is left in the mixture and after an hour we observe the stem and it shows that the ink is present inside the stem shows that the stem conducted the water and the ink, as well as the colored ink patches, are observing it proves that  the xylem and its elements help stem to conduct the water.

So the correct option is 'The conduction of water and ink by the stem'

Axillary buds develop

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Endogenously from plerome

  2. Endogenously from pericycle

  3. Exogenously from outer cortex

  4. Exogenously from epidermis

Show answer
Correct Option: C
Explanation:
Axillary buds develop from the outside, that is exogenously from outer layers of the cortex.
So, the correct answer is 'Exogenously from outer cortex'

Which is not a characteristic feature of the stem?

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Arises from plumule and is ascending

  2. Growing apex is having a bud

  3. Hairs are multicellular

  4. Branches arise endogenously

Show answer
Correct Option: A

Primary phloem, secondary phloem, internal phloem and included phloem, occur in the stem of ______________.

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Salvadora

  2. Leptadenia

  3. Aristolochia

  4. Nyctanthes

Show answer
Correct Option: A

Ginger is

biology types and parts of plants leaves root, stem, and leaves basics of roots and stem

  1. Stem

  2. Root

  3. Fruit

  4. Bulb

Show answer
Correct Option: A

Hardest leaves are found in?

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Victoria regia

  2. Rafflesia

  3. Raphia vinifera

  4. Metasequoia

Show answer
Correct Option: A

The primary function of leaf is ________.

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Growth

  2. Reproduction

  3. Photosynthesis

  4. Protection

Show answer
Correct Option: C
Explanation:

Leaves are those parts of plants that perform the primary function of photosynthesis and transpiration. Growth, Reproduction and Protection are it's secondary or modified functions.

So, the correct option is 'Photosynthesis'.

The petiole is also known as _________.

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Peduncle

  2. Hypopodium

  3. Mesopodium

  4. Epipodium

Show answer
Correct Option: C
Explanation:
The petiole also called the mesopodium is a cylindrical or sub-cylindrical smooth or grooved stalk of the leaf which lifts the lamina above the level of the stem. 
So, the correct option is 'Mesopodium'.

________ is taken as leaf cutting in Peperomia.

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Only Leaf petiole

  2. Part of the leaf

  3. Entire leaf including petiole

  4. Leaf blade

Show answer
Correct Option: C

Which of the following are called food factories of the plants?

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Leaves

  2. Stem

  3. Roots

  4. Flowers

Show answer
Correct Option: A
Explanation:
The part of the plant which produces food is a leaf. Leaves prepare food in presence of sunlight by a process called photosynthesis. In this process, food is produced by utilizing water and carbon dioxide in the presence of sunlight. Therefore, leaves are called food factories of the plants.
So, the answer is A.

Match the column I with column II and select correct option.

Column-I Column-II
(a) Pedicel i Reduced leaf
(b) Peduncle ii Stalk of the flower
(c) Bract iii Stalk of the leaf
(d) Petiole iv Inflorescence axis
evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. a-ii, b-iv, c-i, d-iii

  2. a-iii, b-iv, c-i, d-ii

  3. a-i, b-iii, c-iv, d-ii

  4. a-iv, b-i, c-ii, d-iii

Show answer
Correct Option: A

Which of the following part of the plant performs photosynthesis?

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Leaves

  2. Stem

  3. Roots

  4. Root nodules

Show answer
Correct Option: A
Explanation:

The plant is morphologically divided into roots, stem and leaves.

  1. Root that forms from the radicle of the embryo and is positively geotropic helps in the absorption of water and mineral from the soil.
  2. The stem that forms from the plumule of the embryo and holds various different part of the plant is positively phototrophic and provide mechanical support to stem.
  3. Leaves that originate from the stem and have a green coloured pigment called chlorophyll is the kitchen of plant and helps to convert the inorganic substance into organic substance.
  4. Root nodules are present in legume plants for the nitrogen fixation.
So, the correct answer is 'Leaves'.

Epiphyllous buds develop from

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Leaf surface

  2. Leaf axil

  3. Leaf base

  4. Stipule

Show answer
Correct Option: A

Which part of the leaf is useful for exchanging gases between the plant and the atmosphere?

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Midrib

  2. Stomata

  3. Veins

  4. Petiole

Show answer
Correct Option: B
Explanation:

A)The midrib is the large strong the central vein in the middle of the leaf.
B)Stomata are the part of leaf present on the epidermis and help in the gaseous change.
C)Veins are the vascular tissue of leaf located at the mesophyll part.
D)The petiole is the part of a leaf that joins the lamina to the base.
So the correct option is 'Stomata'

Which one of these is not a part of a leaf?

evs roots and leaves leaves root, stem, and leaves basics of roots and stem plant adaptation and modification

  1. Midrib

  2. Lamina

  3. Leaf Base

  4. Stamen

Show answer
Correct Option: D
Explanation:

A) The midrib is the large strong central vein in the middle of the leaf.
B) The lamina is the broad green part of the leaf in which photosynthesis takes place.
C) Leaf base is the lowermost part of the leaf from where it attaches to stem or branch.
D) Stamen is the male reproductive part present on a flower.
So the correct option is 'Stamen'.

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