Biology
The diagram below represents an experiment to demonstrate a certain phenomenon in a green plant:
(i) Will the level of mercury in the glass tubing rise or fall? Which conducting tissue of the plant does the glass-tubing represent?
(ii) Define Transpiration.
(iii) How will the rate of the above process differ if the environment of the plant has:
- Less humidity
- High temperature?
(iv) State any two advantages of transpiration to the plant.
(v) Draw a neat labelled diagram of a Plasmolysed cell.
Answer
(i) The level of mercury in the glass tubing will rise. The glass-tubing represents xylem.
(ii) Transpiration is the loss of water in the form of vapour from the aerial parts of the plant.
(iii)
- Less humidity increases the rate of transpiration.
- High temperature increases the rate of transpiration.
(iv) Two advantages of transpiration to the plants are:
- Cooling effect.
- Creation of suction force for ascent of sap.
(v) Labelled diagram of a plasmolysed cell is given below :
Related Questions
Differentiate between the following pairs on the basis of what is mentioned in the brackets:
(i) Transpiration and Guttation (place of occurrence)
(ii) Biodegradable waste and Non-biodegradable waste (One example)
(iii) Population control and Swachh Bharat Abhiyan (One objective)
(iv) Osmosis and Active Transport (Substances undergoing movement)
(v) Metaphase and Anaphase (Position of chromosomes)
The figure given below shows a part of a nephron.
Answer the questions that follow:
(i) In which region of the kidney is the above structure present?
(ii) Label the parts numbered 1 to 4.
(iii) What is the technical term for the process that occurs in part 3?
(iv) Why is fluid X not called urine? Justify your answer.
(v) Draw a neat, labelled diagram of the urinary system of man.
Give appropriate biological technical terms for the following:
(i) The sensory organ in Cochlea.
(ii) Number of live births per 1000 people per year.
(iii) The point of contact between two neurons.
(iv) The accessory gland in human males whose secretion neutralises the acid in the vagina.
(v) Condition when blood sugar level is lowered in the blood.
(vi) Structure which helps in the adjustment of the size of the pupil.
(vii) A surgical method of fertility control in human males.
(viii) Process by which leucocytes migrate through the walls of capillaries.
(ix) A sudden inheritable change in one or more genes.
(x) A non-dividing phase of the cell cycle where more DNA is synthesised.
State two functions of:
(i) Ear
(ii) Ethylene
(iii) Tears
(iv) Testis
(v) Cerebellum