Questions
The bulliform cells of leaves lose their turgidity during excessive _____________.
- Assimilation
- Transpiration
- Photosynthesis
- Respiration
How much water a mango tree can transprire during its growing season?
- $350 - 750$ liters/ day
- $350 - 1750$ liters/ day
- $750 - 3500$ liters/ day
- $1750 - 3500$ liters/ day
Meaningful girdling (ringing) experiment can not be performed within sugarcane because
(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
- Transpiration
- Osmosis/ DPD
- Root pressure
- Osmotic 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.
- i, ii and iii
- ii, iii and iv
- i, ii and iv
- Only i, & iv
Transpiration.
- 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
- There are two guard cells around the opening of stomata.They have an external membrane. They control the opening and closing of the stomata.
- Also come amount of water is lost due to evaporation from the leaves.
- As a result, water level in the epidermal layer of the leaf decrease
- To compensate this loss,more water is brought to the leaves through the xylem.
- Transpiration thus helps in absorption of water and minerals and their distribution to all parts of the plant
- Root pressure pushes the water up during the night time.
The droplets of water arranged at the edges of leaves of roses in the morning are
- Water drops condensed from the atmosphere during night at low temperatures
- Water transpired from the stomata and lenticels
- Water produced on the leaves from the reaction of hydrogen and atmospheric oxygen
- None of the above
Transpiration is mainly a process of ______________.
- Imbibition
- Respiration
- Osmotic pressure
- Diffusion
Wilting occurs when there is ___________________.
- Transpiration higher than absorption
- Absorption higher than transpiration
- Higher relative humidity of atmosphere
- Excess root pressure
The process of loss of water through the leaves and stem is called
- Transpiration
- Respiration
- Photosynthesis
- Pollination
In transpiration, water is lost in form whereas in guttation water is lost in the form of
- Vapour, liquid
- Liquid, vapour
- Solid, vapour
- Vapour, solid
The process by which plants lose water from leaves by evaporation is called as
- Respiration
- Photosynthesis
- Transpiration
- Absorption
Transpiration takes place maximum through which of the following structures in plants?
- Flowers
- Stem
- Leaves
- Roots
Potometer works on the principle of -
- Potential difference between the tip of the
tube and that of the plant - Amount of water absorbed equals the amount
transpired - Osmotic pressure
- Root pressure
Transpiration is best defined as
- loss of water from the plant
- loss of water as vapour from the plant
- evaporation of water from the surface of leaves
- None of the above
During transpiration, the leaves lose more water from their upper surface.
- True
- False
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.
- True
- False
Which of the following plants do not transpire?
- Algae
- Fungi
- Submerged hydrophytes
- All of the above
The stem of the plant when cut and dipped in the water helps in the transport of
- Water
- Minerals
- Food
- All of the above
The plants with weak stem growing by spreading on the ground are
- Creepers
- Runners
- Climbers
- None of the above
The water and minerals are conducted by the stem to which part/s of the plant?
- Leaves
- Flowers
- Buds
- All of the above
The stem was cut and dipped in water and red ink and colour of the leaves became red due to
- The absorption of red ink by the leaves from the water
- The conduction of water and ink by the stem
- The loss of green colour from the leaves
- None of the above
Axillary buds develop
- Endogenously from plerome
- Endogenously from pericycle
- Exogenously from outer cortex
- Exogenously from epidermis
Which is not a characteristic feature of the stem?
- Arises from plumule and is ascending
- Growing apex is having a bud
- Hairs are multicellular
- Branches arise endogenously
Primary phloem, secondary phloem, internal phloem and included phloem, occur in the stem of ______________.
- Salvadora
- Leptadenia
- Aristolochia
- Nyctanthes
Ginger is
- Stem
- Root
- Fruit
- Bulb
Hardest leaves are found in?
- Victoria regia
- Rafflesia
- Raphia vinifera
- Metasequoia
The primary function of leaf is ________.
- Growth
- Reproduction
- Photosynthesis
- Protection
The petiole is also known as _________.
- Peduncle
- Hypopodium
- Mesopodium
- Epipodium
________ is taken as leaf cutting in Peperomia.
- Only Leaf petiole
- Part of the leaf
- Entire leaf including petiole
- Leaf blade
Which of the following are called food factories of the plants?
- Leaves
- Stem
- Roots
- Flowers
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 |
- a-ii, b-iv, c-i, d-iii
- a-iii, b-iv, c-i, d-ii
- a-i, b-iii, c-iv, d-ii
- a-iv, b-i, c-ii, d-iii
Which of the following part of the plant performs photosynthesis?
- Leaves
- Stem
- Roots
- Root nodules
Epiphyllous buds develop from
- Leaf surface
- Leaf axil
- Leaf base
- Stipule
Which part of the leaf is useful for exchanging gases between the plant and the atmosphere?
- Midrib
- Stomata
- Veins
- Petiole
Which one of these is not a part of a leaf?
- Midrib
- Lamina
- Leaf Base
- Stamen