Biology
Explain the following terms:
(i) Greenhouse effect.
(ii) Turgor pressure.
(iii) Selective reabsorption.
(iv) Natality.
(v) Pulse.
Roots Absorption
ICSE
2 Likes
Answer
(i) The phenomenon by which certain gases specially CO2 and methane (CH4) accumulating in the atmosphere prevent the escape of heat, thereby warming the earth’s surface is known as Greenhouse effect.
(ii) The pressure of the cell contents on the cell wall is called Turgor pressure.
(iii) The glomerular filtrate entering the renal tubule is an extremely dilute solution containing a lot of useful materials such as glucose and some salts such as those of sodium. As this filtrate passes down the renal tubule, a lot of water along with these usable materials is reabsorbed. But their reabsorption is only to the extent that the normal concentration of the blood is not disturbed. This is called Selective Absorption.
(iv) Natality is the number of live births per thousand people per year.
(v) Pulse is the alternate expansion and elastic recoil of the wall of the artery during ventricular systole.
Answered By
2 Likes
Related Questions
The diagram below represents the human heart in one phase of its functions. Study the diagram carefully and answer the questions that follow:
(i) Name the phase.
(ii) Which part of the heart is contracting in this phase? Give a reason to support your answer.
(iii) Name the parts labelled 1 to 4.
(iv) What type of blood flows through '2'?
(v) State the function of the part numbered '5'.
(vi) Name the membrane that covers the heart.
Draw neat and labelled diagrams of the following:
(i) Malpighian Capsule.
(ii) A Myelinated Neuron.
In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r):
(i) Draw a Punnett square to show the gametes and offspring when both the plants have heterozygous round seeds (Rr).
(ii) Mention the Phenotype and Genotype ratios of the offsprings in F2 generation.
(iii) Name the sex chromosomes in human males and females.
(iv) Briefly explain the term 'Mutation'
(v) What is the number of chromosomes in the gametes of human beings?
The diagram given below shows the male urinogenital system of a human being. Study the diagram and answer the questions that follow:
(i) Label the parts numbered 1 to 8.
(ii) Name the corresponding structure of part (4) in female reproductive system.
(iii) What is the role of part 7?