Functions of the leaf - class-XII
Description: functions of the leaf | |
Number of Questions: 44 | |
Created by: Preeti Dasgupta | |
Tags: vegetative morphology major activities of living organisms transpiration the leaf transport in plants morphology of flowering plants botany plant physiology mineral nutrition in plants plant nutrition biology |
Generally, gravitational water is utilized by the plants.
Which of the following is not a type of potometer ?
Approx. _______ of the water absorbed by a plant is lost in transpiration.
Significance of transpiration lies in
Exchange of gases occur through
Which of the following processes lower the temperature of leaves cooling effect?
Plant use _____ % of the absorbed water.
If transpiration stops than
Which of the following can regulate the rate of transpiration?
Water is ideal material for disposal of excess solar energy because
In weighing method of transpiration measurement there is
Choose the correct answers from the alternatives given.
Which of the following is not a part of the transpiration cohesion-adhesion theory of the ascent of xylem sap?
Who said that "transpiration is a necessary evil"?
Grafted flower is contained in saline water because
Generally stomata found on the lower surface of leaf. Thus, approximate percentage of transpiration through abaxial surface is
Which one is the driving force for the process of passive absorption of water in roots?
Transpiration ratio is the ratio of moles of H$ _{2}$O transpired / moles of CO$ _{2}$ fixed. This ratio is measure of
Water moves up against gravity and even for a tree of $20$m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is ____________.
Choose the correct answers from the alternatives given.
Which of the following forces is responsible for moving water up to the tops of the tallest trees?
Choose the correct answers from the alternatives given.
What is the action spectrum of transpiration?
Oxygen is returned to the atmosphere mainly by __________.
Oxygen we breathe is obtained from ________
Carbohydrates, the most abundant biomolecules on earth are produced by
Photosynthesis is essential for survival of
In cereals, which one of the following kinds of leaves plays a key role in the supply of photosynthates to the developing grain?
Match List I with List II and select the correct answer using the codes given the lists.
List I | List II |
---|---|
a. Dictyosomes | $1$. Storage |
b. Mitochondria | $2$. Photosynthesis |
c. Vacuoles | $3$. Transport |
d. Grana | $4$. Secretion |
$5$. Respiration |
Photosynthetic pathway for liberation of one molecule of ${ O } { 2 }$ requires 8 quanta. Then how many NADPH are formed during this process __________________.
Photosynthesis in CAM-plants in minimal because of the limited amount of _________________.
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
If a $C _4$ plants needs to fix $5CO _2$ then how many ATP molecules does it use in its bundle sheath cells to do so?
What would happen if green plants disappear from earth?
The leaf which produces spores is called
Palisade cells and spongy cells are found in:
Match the following and choose the correct option.
A. | Leaves | i. | Anti-transpirant |
---|---|---|---|
B. | Seed | ii. | Transpiration |
C. | Roots | iii. | Negative osmotic potential |
D. | Aspirin | iv. | Imbibition |
E. | Plasmolyzed cell | v. | Absorbtion |
Match List-I with List-II and select the correct answer.
List-I | List-II |
---|---|
a. when the leaf is rolled from one margin to the other | $1$. Centuplicate |
b. When the leaf is rolled from the apex towards the base | $2$. Convolute |
c. When upper half of the lower half | $3$. Criminate |
d. When the leaf is folded lengthwise along the midrib | $4$. Replicate |
Which of the following is not the modification of leaf?
Which one of the following pairs is correctly matched?
Choose the correct answers from the alternatives given.
One important difference between the anatomy and physiology of roots and leaves is that
The classical experiments on growth were performed by
Ultrafiltration theory for permeability of cell membrane was put forth by
Meaningful girdling (ringing) experiment cannot be done on sugarcane because
A small mesophytic twig with green leaves is dipped into water in a big beaker under sunlight. It demonstrates
Who proposed the retention pressure theory for the permeability of the membrane?
Which of the following is the significance of photosynthesis?