Transpiration has been described as a necessary evil because it is inevitable, but potentially harmful. Which of the following are the after-effects of transpiration ?
i) Absorption of mineral salts.
ii) Regulation of plant temperature.
iii) Wilting and injury in plants.
iv) Ascent of sap.
i & iv
i, ii & iii
i, ii & iv
All of these
The number of phosphate molecules present in ATP is
2
3
4
6
In order to destarch the leaves for an experiment to show that sunlight is necessary for photosynthesis, the :
leaves are kept in alcohol and boiled in a water bath
leaves are soaked in iodine for two hours
plants with the leaves is kept in dark room for 48 hours
plant with the leaves is exposed to light of a lamp, a night before the experiment
What are the energy producing centres in the cell?
Mitochondria
Golgi complex
Vacuole
Ribosomes
Which instrument is used for measuring blood pressure ?
Stethoscope.
Electrocardiograph
Echocardiograph.
Sphygmomanometer
Inspiration or breathing-in is an active process. Which of the following events are related to this process ?
Lifting up of rib cage and contraction of diaphragm.
Lifting up of rib cage and relaxation of diaphragm
Dropping rib cage and relaxation of diaphragm
Dropping rib cage and contraction of diaphragm
In anaerobic respiration
Glycolysis does not take place
Water molecule is split
Oxygen acts as a final electron acceptor
Ethyl alcohol is the common end product
Which of the following statements are true about respiration ?(i)During inhalation,ribs move inward and diaphragm is raised.(ii)The gaseous exchange takes place in the alveoli.(iii) Hemoglobin has greater affinity for carbon dioxide than oxygen.(iv)Alveoli increase surface area for the exchange of gases.
(i) and (iv)
(ii) and (iii)
(i) and (iii)
(ii) and (iv)
It is a relatively inactive and highly soluble sugar and constitutes about 90% of the total solute carried in the phloem. Identify it.
Starch
Glucose
Fructose
Sucrose
The breakdown of pyruvate to give carbon dioxide,water and energy takes place in
Cytoplasm
Chloroplast
Nucleus
