Class 10 Science Chapter 9 MCQ Online Test for 2020-2021
Class: 10 | Science |
Chapter: 9 | Heredity and Evolution |
Contents: | MCQ Online Tests with Answers and Explanation |
Class 10 Science Chapter 9 MCQ with Answers for 2020-21
Class 10 Science Chapter 9 MCQ Online Test with solutions and answers. All the questions are taken from NCERT intext part as well as exercises section. Answers and explanation are also taken from NCERT Books for Class 10 Science only.
Q1
Consider the following statements and choose the incorrect one:
[A]. The process by which new species develop from the existing species is known as specification.
[B]. A species is a population of organisms consisting of similar individuals which can breed together and produce fertile offspring.
[C]. Geographical isolation is the major factor in the specification of sexually reproduce reproducing animals because it interrupts the flow of genes between their isolated population through the gametes.
[D]. None of the above
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
Q2
Kiran is completed her science chapter where she wrote some statements on “Darwin’s theory”. She wants to know whether the statements are correct or not? Kiran wants to take help from you:
[A]. Variations when accumulated over a long period of time, lead to the origin of a new species.
[B]. Even though all species produce a large number of offspring, populations remain fairly constant naturally.
[C]. The fit individuals possessing favorable variation to survive and reproduce, called natural selection or survival of the fittest.
[D]. All the above.
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
Q3
In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?
[A]. The changes in the non-reproductive body cells of an organisms cannot be inherited by its offspring.
[B]. A trait or characteristic of an organism which is “not inherited” but develops in response to the environment is called an acquired trait.
[C]. A trait of an organisms which is caused by a change is in its genes or DNA is called an inherited trait.
[D]. The acquired traits of organisms can be passed on to their future generations.
Answer: Option D
Explanation:The acquired traits of organisms cannot be passed on to their future generations.
If we breed some mice, all the progeny of mice will have tails, just like their parents. Now, if we cut the tails of these first-generation mice surgical and breed them, we will get new mice, all with full details. It has been observed that even after cutting the tails of mice for a number of generations, a tail-less mouse is never born.
Actually, the cut tail of mice is an acquired trait which is never passed on to their progeny. This is because cutting the tails of mice does not change the genes of their reproductive cells or gametes.
Q4
The two versions of a trait (character) which are brought in by the male and female gametes are situated on
[A]. Copies of the same chromosome
[B]. Two different chromosomes
[C]. Sex chromosomes
[D]. Any chromosome
Answer: Option A
Explanation:The two versions of a trait a sweet situated on copies of same chromosome. Each parent contributes one copy of the gene for a particular character. In the gamete however, only one copy is present due to reduction division. At the time of fusion, the diploid condition is maintained. Sex chromosomes carry genes for sexual characters.
Q5
Which of the following statement is or are correct?
[A]. Gametes constitute the link between one generation and the next, and pass on the paternal (or father’s) and maternal (or mother’s) characters or traits to the offspring.
[B]. The transmission of characters or traits from the parents to their offspring is called heredity.
[C]. The hereditary information is present in the sex cells or gametes of the parents.
[D]. All the above
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
Q6
Select the incorrect statement
[A]. Frequency of certain genes in a population change over several generations resulting in evolution
[B]. Reduction in weight of the organism due to starvation is genetically controlled
[C]. Low weight parents can have heavy weight progeny
[D]. Traits which are not inherited over generations do not cause evolution
Answer: Option B
Explanation:The weight reduction due to starvation will not change the DNA of the germ cells, because low weight is not a trait that is genetically controlled or inherited. Thus, low weight parents may have heavy weight progeny.
Traits which are not inherited, i.e. the acquired traits are simply changes in non-reproductive tissues, so, cannot be passed on to DNA of germ cell.
Evolution results from change in frequency of genes in a population over several generations.
Q7
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are
[A]. Large chromosome, and small chromosome
[B]. Y-chromosome
[C]. Y-chromosome, and X-chromosome
[D]. Small chromosome, and X-chromosome
Answer: Option C
Explanation:In human males, one pair called the “Sex chromosomes” are unpaired. Here, one is a normal sized X-chromosome while other is a short Y-chromosome. Women have a perfect pair of sex chromosomes, both called X.
Q8
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F1 generation are
[A]. Round and yellow
[B]. Round and green
[C]. Wrinkled and green
[D]. Wrinkled and yellow
Answer: Option A
Explanation:The cross between RRyy and rrYY seeds will produce RrYy (round and yellow) seeds in F1 generation, because round and yellow are dominant traits.
Q9
Priya is writing some statements, choose the incorrect statement and help him:
[A]. The differences in the characters among the individuals of a species is called variation.
[B]. The free earlobes and attached earlobes are the two variations found in human population.
[C]. The significance of a variation shows up only if it continues to be inherited by the offspring for several generations.
[D]. The great disadvantage of variation to a species is that it increases the chances of its survival in a changing environment.
Answer: Option D
Explanation:The accumulation of “heat resistant variation” or trait in some bacteria will ensure its survival, even when the temperature in its environment rises to much due to a heat wave or some other reasons. On the other hand, the bacteria which did not have these variations to withstand heat would not survive under these circumstances and die.
Q10
Which of the following statement is or are correct?
[A]. Gregor Mendel was the first scientist to make a systematic study of patterns of inheritance which involved the transfer of characteristics from parents to progeny.
[B]. The gene which can decide the appearance of an organism only in the presence of another identical gene is called a recessive gene.
[C]. The gene which decides the appearance of an organism even in the presence of an alternative gene is known as dominant gene.
[D]. All the above
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
tors that live on this earth long, long ago.
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Which type of traits can be inherited?
Those Variations, which arise during the process of reproduction, can be inherited.
What is meant by heredity?
Transfer of traits from parents to offspring is called heredity.
How do we determine the age of fossil?
There are two components to determine the age. One is, if we dig into the earth and start finding fossils, it is reasonable to suppose that the fossils we find closer to the surface are more recent than the fossils we find in deeper layers. The second way of dating fossils is by detecting the ratios of different isotopes of the same element in the fossil material.
What are fossils?
When a living being dies and the dead body gets caught in hot mud, for example, it will not decompose quickly, and the mud will eventually harden and retain the impression of the body parts of the living being. All such preserved traces of living organisms are called fossils.