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Biology: CUET Mock Test - 9


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40 Questions MCQ Test CUET Science Subjects Mock Tests | Biology: CUET Mock Test - 9

Biology: CUET Mock Test - 9 for Class 12 2022 is part of CUET Science Subjects Mock Tests preparation. The Biology: CUET Mock Test - 9 questions and answers have been prepared according to the Class 12 exam syllabus.The Biology: CUET Mock Test - 9 MCQs are made for Class 12 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Biology: CUET Mock Test - 9 below.
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Biology: CUET Mock Test - 9 - Question 1

The figure shows the skull of which Homo erectus?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 1

The skull belongs to Homo erectus erectus, also known as Java man. Chin was absent whereas jaw prognathous. They were omnivorous. Cannibalism was also found.

Biology: CUET Mock Test - 9 - Question 2

Who among Homo erectus used fire for hunting, protection, and cooking?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 2

Homo erectus erectus, also known as Java man used fire for hunting, protection, and cooking. It had complete erect posture and lived in caves. It used tools of bones and stones.

Biology: CUET Mock Test - 9 - Question 3

Who was known as the direct ancestors of homo sapiens?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 3

Homo erectus were known as the direct ancestors of humans. It had many similarities to modern man. Their face, skull structure, and posture were the same.

Biology: CUET Mock Test - 9 - Question 4

The cranial capacity of Homo habilis was _____ c.c.

Detailed Solution for Biology: CUET Mock Test - 9 - Question 4

They had a cranial capacity of 650-800 c.c. They were the first human being like and had complete erect posture similar to them. They had the knowledge to create tools of stones to hunt.

Biology: CUET Mock Test - 9 - Question 5

Which of the following is not included in natural selection?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 5

Natural selection mainly leads to three selections. They are: Stabilizing selection, directional selection, and disruptive selection. Technical selection does not belong to natural selection. This classification is based on different organism-environmental relationship.

Biology: CUET Mock Test - 9 - Question 6

Mortality in babies is an example of ______

Detailed Solution for Biology: CUET Mock Test - 9 - Question 6

Mortality in babies is an example of stabilizing selection. It is all depended on the baby’s birth weight. The optimum birth weight is 7.3 pounds which favor this selection. Newborn infants with less than 5.5 pounds and more than 10 pounds have the highest mortality rate.

Biology: CUET Mock Test - 9 - Question 7

Directional selection is also known as ______

Detailed Solution for Biology: CUET Mock Test - 9 - Question 7

Directional selection is also known as progressive selection. This selection always operates in a changing environment. After this natural selection, mean value always changed.

Biology: CUET Mock Test - 9 - Question 8

Which is the correct example regarding this diagram?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 8

The graph given belongs to directional selection as the graph shifts to one direction. The resistance of insects to DDT is an example of directional selection. A single mutation which occurred in a specific gene helped them to breakdown the toxin. It shows that it favored one extreme value.

Biology: CUET Mock Test - 9 - Question 9

How many peaks are there in the disruptive selection?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 9

In disruptive selection, most of the individuals get the periphery values at both ends of the curve given in the graph. The population gets divided into two different groups. Hence, they have two peaks which resemble a two-humped camel.

Biology: CUET Mock Test - 9 - Question 10

 How does shell pattern in limpets show disruptive selection?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 10

Limpets shell has a continuous pattern with color ranging from pure white to dark tan. They either attached to white gooseneck barnacles or to tan colored rocks. The light-colored limpets camouflaged with white barnacles while tanned limpets camouflaged on tan-colored rocks. But, the limpets with intermediate shell patterns were conspicuous and were preyed by predatory shorebirds.

Biology: CUET Mock Test - 9 - Question 11

Marine mollusca is also known as _____

Detailed Solution for Biology: CUET Mock Test - 9 - Question 11

Marine mollusca is also known as limpets. They are aquatic snails with a conical shaped shell with a muscular foot. They are members of the family Gastropoda. Their shell pattern shows disruptive selection.

Biology: CUET Mock Test - 9 - Question 12

What happens during disruptive selection?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 12

In disruptive selection, the members of both extreme are selected. The average gets rejected. Most of the individuals get values other than the mean character value. The naturally selected members are shown by two peaks.

Biology: CUET Mock Test - 9 - Question 13

This diagram represents which selection?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 13

This graph indicates stabilizing selection. As we can see, the peak gets higher and narrower. In this selection, most of the individuals acquire mean character value.

Biology: CUET Mock Test - 9 - Question 14

Which of the following are properties of stabilizing selection?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 14

Stabilizing selection operates in a constant environment. It favors the average or complex phenotype and eliminates the extreme values. The mean value never changes. Also, the peak gets higher and narrower.

Biology: CUET Mock Test - 9 - Question 15

Which of the following is monocistronic?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 15

Cistrons are the segments of the DNA helical structure which code for polypeptide chains. The structural gene in the transcription unit can be either monocistronic or polycistronic. The monocistronic genes are mostly present in eukaryotes.

Biology: CUET Mock Test - 9 - Question 16

Which of the following is the key difference between exons and introns?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 16

The sequences of the genes which appear in the mature or processed RNA are called as exons. They are the coding sequences of the gene. These sequences are interrupted by introns. Introns are the intervening sequences which aren’t present in both the mature or the processed RNA.

Biology: CUET Mock Test - 9 - Question 17

Which of the following is polycistronic?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 17

The polycistronic organisms can code for more than one polypeptide sequence as individuals inside the RNA molecule. Examples of such are the bacteria and prokaryotes.

Biology: CUET Mock Test - 9 - Question 18

What is a cistron?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 18

A cistron is the segment of a DNA. It is responsible for coding polypeptide chains. This is seen during the process of protein synthesis.

Biology: CUET Mock Test - 9 - Question 19

Which of the following is an adapter molecule?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 19

The tRNA was known by the name sRNA in its early days. sRNA stands for soluble RNA. This was even before the postulation of the genetic code. But, the role of tRNA as an adapter was assigned much later.

Biology: CUET Mock Test - 9 - Question 20

Which of the following is the actual structure of the tRNA?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 20

The actual structure of the tRNA is actually a compact molecule which appears to be like an inverted L shaped molecule. But, the secondary structure of the tRNA appears to look like a clover leaf shaped structure.

Biology: CUET Mock Test - 9 - Question 21

What does the anticodon loop of the tRNA contain?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 21

The stop codons are UAA, UAG and UGA. These codons are absent in the tRNA molecules. tRNA possesses an amino acid acceptor end which is the site for binding the amino acids. Finally, the anticodon loop of the tRNA contains bases that are complementary to the codes.

Biology: CUET Mock Test - 9 - Question 22

Who came up with the idea of “adapter molecule”?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 22

Amino acids do not have any structural specialties to read a code. Francis Crick came up with an ideology that an adapter molecule will be present. This adapter molecule will be capable of both reading the code and also on binding itself to the specific amino acid.

Biology: CUET Mock Test - 9 - Question 23

People suffering from colour blindness fail to distinguish which of the two colours?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 23

People who are colour blind fail to distinguish between red and green colours. Colour blindness is a sex-linked recessive trait in which the normal gene and its recessive allele are carried by X-chromosome.

Biology: CUET Mock Test - 9 - Question 24

Which of the following type of inheritance is shown by colour blindness?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 24

Colour-blindness is a sex-linked trait which shows criss-cross inheritance which means male transmits his trait to his grandson through his daughter, while a female transmits the traits to her granddaughter through her son.

Biology: CUET Mock Test - 9 - Question 25

What percentage of children are colour blind if their father is colour blind and the mother is a carrier for Colour blindness?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 25

The percentage of children which are colour blind if their father is colour blind and the mother is a carrier for colour blindness is 50% because the father will produce Xc and Y chromosome and the mother will produce Xc and X chromosomes. Their children will have the genotypes- XcY, XY, XcXc and XcX. Therefore, 50% of children are colour blind, 25% have normal vision and 25% are the carriers of the disease.

Biology: CUET Mock Test - 9 - Question 26

How can a female be haemophilic?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 26

A female can only be haemophilic if her mother is at least a carrier of this disease and her father is haemophilic. But the possibility of a female becoming haemophilic is extremely rare because being haemophilic for the parents at the later stage of life is unviable.

Biology: CUET Mock Test - 9 - Question 27

What is the percentage of children being a carrier of haemophilia if their mother is a carrier and their father is a normal man?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 27

The percentage of children being a carrier of haemophilia if their mother is a carrier and their father is a normal man is 25% because the gametes formed by mother are X and Xh while the gametes formed by father are X and Y. The genotype of the offspring obtained would be XY, XX, XXh and XhY. Thus 50% of children are normal, 25% are carriers of haemophilia and 25% are haemophilic (only son).

Biology: CUET Mock Test - 9 - Question 28

In which of the following places thalassemia is not common?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 28

Thalassemia is not common in North America. It is common in the Middle East, Indian subcontinent, Mediterranean and South-east Africa. It originated in the Mediterranean region and is caused by the deletion or mutation of the chromosomes.

Biology: CUET Mock Test - 9 - Question 29

Which of the following statements is incorrect with respect to alpha-thalassemia?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 29

Alpha-thalassemia is not inherited in a Mendelian dominant fashion. Instead, it is inherited in a Mendelian recessive fashion. It involves the genes HBA1 and HBA2 and it is also connected to the deletion of the 16p chromosome.

Biology: CUET Mock Test - 9 - Question 30

Which of the chromosome mutation leads to Beta-thalassemia?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 30

 The mutation in the HBB gene on chromosome number 11 leads to the disorder beta-thalassemia. It is inherited as an autosomal recessive trait. The severity of beta-thalassemia depends upon the nature of the mutation.

Biology: CUET Mock Test - 9 - Question 31

By which of the following defects, thalassemia is caused?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 31

The defect in the synthesis of globin polypeptide in RBC causes a group of disorders known as thalassemia. Absence or reduced synthesis of one of the globin chains leads to the excess of other chains which accumulate in our body to causes different diseases.

Biology: CUET Mock Test - 9 - Question 32

How many genotypes of sickle cell anaemia are possible in a population?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 32

Three types of genotypes of sickle cell anaemia are possible in a population. These are:
i. HbA HbA: Normal individuals
ii. HbA HbS: Normal individuals but act as a carrier in spreading the disease
iii. HbS HbS: Diseased individuals and they die before attaining maturity

Biology: CUET Mock Test - 9 - Question 33

What is the full form of AHG?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 33

AHG stands for Anti haemophilic globulin. It is a type of blood protein which is required for normal blood clotting. The person suffering from haemophilia A cannot synthesise this protein and even a small cut may lead to continuous bleeding for a long time.

Biology: CUET Mock Test - 9 - Question 34

What will be the percentage of sons having a normal vision if the father has normal vision and their mother is colour blind?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 34

The percentage of sons having normal vision, if the father has normal vision and mother is colour blind is 0% because as colour blindness is a sex-linked trait, it means that the trait only transmits through X-chromosome. As the mother is colour blind, both her gametes will carry the gene for colour blindness, so none of their sons will have a normal vision.

Biology: CUET Mock Test - 9 - Question 35

When can a female be colour blind?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 35

A female can be a colour blind only in two conditions:
i. When her father is colour blind and her mother is the carrier of this disease
ii. When both her father and her mother are colour blind
Therefore, for a female to be colour blind, her father must also have colour blindness.

Biology: CUET Mock Test - 9 - Question 36

 What diagram is used to study the production of zygotes in F1 and F2 generation?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 36

The Punnett square is a mathematical tool used in probability and statistics. Mendel employed it to study the genotypes of F1 and F2 progeny based on the games produced by the previous generation.

Biology: CUET Mock Test - 9 - Question 37

Where are the parental genotypes mentioned in a Punnett square?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 37

Punnett square gives a graphical representation for the transfer of genetic information in crosses. The gametes from the parents are represented on the top and the left sides of the Punnett square.

Biology: CUET Mock Test - 9 - Question 38

What gametes are produced by a Vv heterozygous plant?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 38

The process of segregation that occurs during meiosis is a random process. Thus the gametes will have 50% of each allele. Hence Vv heterozygous plant would produce 50% V and 50% v containing gametes.

Biology: CUET Mock Test - 9 - Question 39

Which of the following is the correct number of offsprings produced by self-fertilization of a heterozygous pea plant for a trait that exhibits Mendelian genetic pattern?

Detailed Solution for Biology: CUET Mock Test - 9 - Question 39

Self-fertilization of heterozygote will lead to 25% homozygous dominants, 25% homozygous recessive, and 50% heterozygous dominants. This is satisfied if the population sampled has 250 homozygous dominant and recessive plant and 500 heterozygous dominant plants.

Biology: CUET Mock Test - 9 - Question 40

The ratio of phenotypes observed in progeny after a cross has been performed is called ________

Detailed Solution for Biology: CUET Mock Test - 9 - Question 40

The phenotypes of a progeny can be studied by manually counting the offsprings. The ratio of different phenotypes defines the phenotypic ratio of the cross.

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