Tag: biology

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Questions Related to biology

Multiple choice biology physical resources air and winds wind energy air as a natural resource

The instrument which measures wind velocity is

  1. Lactometer

  2. Anemometer

  3. Hydrometer

  4. Barometer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Anemometer is the instrument used to measure wind velocity. Hydrometer measures specific gravity (or relative density) of liquids. Barometer is used to measure atmospheric pressure. Lactometer measures cream content of milk.

Multiple choice biology physical resources air and winds wind energy air as a natural resource

The instrument which measures wind velocity is

  1. Lactometer

  2. Anemometer

  3. Hydrometer

  4. Barometer
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An anemometer is the standard instrument used to measure wind speed or velocity. A barometer measures atmospheric pressure, a hydrometer measures liquid density, and a lactometer measures the purity of milk.

Multiple choice biology physical resources air and winds wind energy air as a natural resource

As the air temperature increases, the air's capacity for water vapor:

  1. Increases

  2. Decreases

  3. Remains constant

  4. Is unrelated to air temperature and can either increase or decrease
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Warmer air has a higher kinetic energy, allowing it to hold more water vapor molecules in the gaseous phase. This relationship is described by the Clausius-Clapeyron relation, which shows that saturation vapor pressure increases with temperature.

Multiple choice biology physical resources air and winds wind energy air as a natural resource

The earth's first atmosphere was composed primarily of:

  1. Carbon dioxide and water vapor

  2. Hydrogen and helium

  3. Oxygen and water vapor

  4. Argon and nitrogen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Earth's primordial atmosphere was formed from the gases present in the solar nebula, which were primarily hydrogen and helium. These light gases were eventually lost to space due to the Earth's low gravity and solar wind.

Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

Choose the correct answer from the alternatives given.


A couple has six daughters, What is the possibility of their having a girl next time?

  1. 10%

  2. 50%

  3. 90%

  4. 100%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The possibility of having a girl or boy child is equal Le., 50% as 50% male gametes are Y type and 50% are X type. Fusion of egg with X type sperm will produce a girl child. 

Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

If the first seven children born to a particular pair of parents are all males, what is the probability that the eighth child will also be a male?

  1. $\dfrac{1}{2}$
  2. $\dfrac{1}{4}$
  3. $\dfrac{1}{8}$
  4. $\dfrac{1}{16}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The sex of an individual depends on the combination of sex chromosomes in its cells, that is, the combination of X and Y chromosomes. An embryo with XX genotype would develop into a female, while an embryo with an XY would develop into a male. The mother has a genotype and would always produce gametes with an X chromosome. The father, however, would produce half the gametes having an X chromosome and half carrying a Y chromosome. The sex of the embryo in humans would hence depend on the chromosome present in the gamete of the father. For every child conceived, there is an equal probability of the child being a male or a female, as the gamete received from the father has a 50% chance of carrying an X chromosome and  50% chance of carrying a Y chromosome.
So, the correct answer is $\dfrac{1}{2}$
Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

In human beings, the gametes from the .......... decides the sex of the baby.

  1. Male parent

  2. Female parent

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Sex is determined by two chromosomes, X and Y. A female is XX, a male is XY. Since women completely lack the Y chromosome, they always contribute an X chromosome to the baby. The sex is determined by whether the sperm that fertilizes the egg is carrying another X or a Y.
The generally accepted theory is that males determine the sex because males can donate both an X chromosome or Y chromosome, while females can only donate an X chromosome to their offspring, making their contribution constant and the male's contribution the variable which, under normal circumstances, determines the offspring's genetic sex.
Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

A son inherits an X chromosome from 

  1. Mother

  2. Father

  3. Both A and B

  4. Grandparents
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A child will inherit Y chromosome from father to become a boy. In human being, Y is the factor of maleness.
Male parent:  XY     x      Female parent: XX
Gametes:      X, Y            X
Offspring:     XX (Female child), XY  (Male child)
Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

A child who inherits an Y chromosome from father will be a girl.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A child will inherit Y chromosome from father to become a boy and X chromosome to become a girl. In human being, Y is the factor of maleness.
Male parent:  XY     x     Female parent: XX
Gametes:      X, Y           X
Offspring:     XX (Female child) , XY  (Male child)
Multiple choice biology mendel's law of inheritance determination of sex sex determination sex determination in humans

Mother is responsible for the sex of a baby.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sex of the child is completely dependent on the father and not mother. This is because men are XY and women are XX. This means that the woman can only donate one X chromosome to her child, while the father can either donate an X or a Y. If the father donates the X to the child, it will be XX and become a female, if the father donates a Y to the child, it will be XY and will become a male.