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Biology: CUET Mock Test - 10


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40 Questions MCQ Test CUET Science Subjects Mock Tests | Biology: CUET Mock Test - 10

Biology: CUET Mock Test - 10 for Class 12 2023 is part of CUET Science Subjects Mock Tests preparation. The Biology: CUET Mock Test - 10 questions and answers have been prepared according to the Class 12 exam syllabus.The Biology: CUET Mock Test - 10 MCQs are made for Class 12 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Biology: CUET Mock Test - 10 below.
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Biology: CUET Mock Test - 10 - Question 1

According to the law of dominance, what are the discrete units that control the characters?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 1

The law of dominance states characters encoded by discrete units. Mendel called these factors, which he believed transferred from parents during progeny during fertilization. These are now known as genes.

Biology: CUET Mock Test - 10 - Question 2

Which of the following is not a statement of the principle of dominance?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 2

The principle of dominance does not state the segregation of factors. This is stated by the law of segregation or separation.

Biology: CUET Mock Test - 10 - Question 3

A homozygous parent produces gametes that are ______; while the heterozygous parent produces gametes that are _______

Detailed Solution for Biology: CUET Mock Test - 10 - Question 3

The law of segregation states that the factors separate during gamete formation. Thus a homozygous parent will produce gametes that have similar factors while the heterozygous parent would produce gametes with dissimilar alleles.

Biology: CUET Mock Test - 10 - Question 4

What generation of Mendelian cross has a phenotypic ratio of 3:1?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 4

The phenotypic ratio is the ratio of different phenotypes observed in the progeny. In the F2 generation of a Mendelian cross, there are 75% plants with dominant phenotype and 25% plants with a recessive phenotype. This gives a phenotypic ratio of 3:1.

Biology: CUET Mock Test - 10 - Question 5

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

Detailed Solution for Biology: CUET Mock Test - 10 - Question 5

The genotypes of a progeny can be studied using Punnett square. The ratio of different genotypes is called the genotypic ratio.

Biology: CUET Mock Test - 10 - Question 6

What is represented in the boxes of the Punnett square?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 6

In the Punnett square, the boxes are filled with the offsprings that can be produced, in principle, from the combinations of gametes of both parents. This can be used to determine the genotypic and phenotypic ratios of the progeny.

Biology: CUET Mock Test - 10 - Question 7

Who deserves the credit to discover Punnett square?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 7

The Punnett square was discovered by a British scientist named Reginald Punnett. Its importance was recognized by Gregor Mendel, who used it to study the patterns of inheritance and thus formulate the laws of inheritance.

Biology: CUET Mock Test - 10 - Question 8

What is the process of removal of anthers termed?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 8

Emasculation is the process of removal of anthers. This is carried out to carry out pollination in a controlled manner and avoid self-pollination.

Biology: CUET Mock Test - 10 - Question 9

What is the generation of plants produced by the crossing of true-breeding plants called?

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

True-breeding plants are taken as parental plants in crosses. Hence offsprings produced by the crossing of these true-breeding plants are F1 progeny.

Biology: CUET Mock Test - 10 - Question 10

What should be the phenotype of the F1 progeny produced by a cross between tall and dwarf true-breeding garden pea plants?

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

Tall plants are dominant over dwarf plants. Being true-breeding parents, the offsprings will all be heterozygous. Moreover, hence phenotypically, all of them will be tall.

Biology: CUET Mock Test - 10 - Question 11

What should be the phenotype of a cross between violet and white-flowered true-breeding garden pea plants?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 11

Violet is the dominant factor over white in pea flowers. Hence violet can express even in the presence of white. The cross of violet true-breeding and white true-breeding pea plants will produce all heterozygous offsprings. Thus, all of them will have violet flowers.

Biology: CUET Mock Test - 10 - Question 12

The factor which expresses in homozygous and heterozygous states is called _______

Detailed Solution for Biology: CUET Mock Test - 10 - Question 12

A dominant factor masks the expression of its recessive counterpart. Thus, it can express in both homozygous and heterozygous states.

Biology: CUET Mock Test - 10 - Question 13

During meiosis, what happens to the parental alleles?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 13

Based on his studies on pea plants, he observed that the parental recessive traits were observed again only in the F2 progeny without any form of blending in F1 generation. This points out that the factors segregate or separate during the process of meiosis.

Biology: CUET Mock Test - 10 - Question 14

The presence of two different alleles at a particular locus results in _________

Detailed Solution for Biology: CUET Mock Test - 10 - Question 14

The presence of two different alleles at a particular locus results in _________
a) Homozygosity
b) Heterozygosity
c) Hemizygosity
d) Nullizygosity

Biology: CUET Mock Test - 10 - Question 15

A plant that exhibits two alleles for only one trait is called ________

Detailed Solution for Biology: CUET Mock Test - 10 - Question 15

Monohybrid refers to a hybrid that differs at only one gene. Thus, a plant that exhibits two alleles for one trait is a monohybrid.

Biology: CUET Mock Test - 10 - Question 16

 If VV produces violet flowers and vv produces white flowers, what will be the phenotype and genotype of the F1 progeny?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 16

The VV and vv upon crossing will produce all progeny with genotype Vv. This is the heterozygous state. Violet being dominant over white, all the progeny will have violet flowers.

Biology: CUET Mock Test - 10 - Question 17

With green pods as a dominant trait over yellow, which of the following crosses will result in all progeny having yellow pods?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 17

Yellow being recessive will express only when both alleles are present. That occurs only when both parents can contribute an allele encoding for the yellow pod. For all progeny to have yellow pods, both parents have to be homozygous for yellow pods.

Biology: CUET Mock Test - 10 - Question 18

I = Inflated, i = constricted. Given that the phenotype of F1 progeny is inflated pods and that the parents are true-breeding, which of the following is not a possible genotype of parents?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 18

Inflated is the dominant phenotype. Hence it can be expressed in two genotypes: II and Ii. The F1 progeny can have it in all the mentioned cases except when both parents are recessive ii.

Biology: CUET Mock Test - 10 - Question 19

What does F in “F1 progeny” stand for?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 19

F1 progeny refers to the first generation of offsprings. This is also termed as the first Filial generation, thereby stating their filial relationship with the true-breeding plants.

Biology: CUET Mock Test - 10 - Question 20

What process needs to be avoided for carrying of efficient crosses?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 20

Self-pollination leads to fertilization by the pollen from the same flower. A cross desires pollination and fertilization by pollen from a different plant. Hence self-pollination needs to be avoided.

Biology: CUET Mock Test - 10 - Question 21

The structure of DNA by ______ received the Nobel Prize in 1962.

Detailed Solution for Biology: CUET Mock Test - 10 - Question 21

One of the central problems in molecular biology was unraveling the structure of DNA. This was finally postulated by Francis Crick and James Watson in 1953. For this, they shared a Nobel Prize in 1962.

Biology: CUET Mock Test - 10 - Question 22

The process of transfer of characters from parents to offspring is referred to as ______

Detailed Solution for Biology: CUET Mock Test - 10 - Question 22

Inheritance or Heredity is the process of transfer of information from parents/ancestors to offsprings. This gives rise to patterns that can be studied using the subject of genetics.

Biology: CUET Mock Test - 10 - Question 23

Who proposed the laws of inheritance in living organisms?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 23

The laws of inheritance in living organisms were proposed by Gregor Mendel. He was the first person to apply the scientific method to understand patterns of inheritance. However, the importance of his work was not recognized until after his death.

Biology: CUET Mock Test - 10 - Question 24

What technique in plant biology was used by Gregor Mendel to derive the patterns of inheritance?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 24

Gregor Mendel carried out the hybridization of pea plants with specific characters and used manual counting to carry out estimates of factors over generations. This gave rise to the laws of inheritance, as we know today.

Biology: CUET Mock Test - 10 - Question 25

Which of the following approaches used by early humans is not an instance of exploitation of variation in population for the benefit of society?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 25

All the 4 options refer to approaches of early humans that have benefitted society. However, the domestication of dog and cow and the artificial selection of wheat as a crop have used the principle of variation and selection of traits best suitable for a particular task.

Biology: CUET Mock Test - 10 - Question 26

What determines the differences between the progeny and parents?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 26

Variation is the difference between individuals within a population. These arise between the progeny and parents/ancestors and form a backbone for natural selection to act on.

Biology: CUET Mock Test - 10 - Question 27

What branch of biology focusses on the study of patterns of inheritance?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 27

Genetics is the branch of biology that deals with questions of inheritance. It uses techniques from various disciplines like Molecular biology, Cell biology, and many more to understand the basis of inheritance.

Biology: CUET Mock Test - 10 - Question 28

What, according to Medel, was responsible for the inheritance of specific traits?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 28

Mendel discovered the laws of inheritance. He attributed these traits being encoded by factors. Later studies showed that these factors are genes.

Biology: CUET Mock Test - 10 - Question 29

What are the invasive methods used to prevent pregnancy called?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 29

Surgical methods are invasive. They work by using a surgical intervention to render one or both partners incompetent.

Biology: CUET Mock Test - 10 - Question 30

Surgical methods are also called as _________

Detailed Solution for Biology: CUET Mock Test - 10 - Question 30

Surgical methods are non-reversible. Hence these render the person sterile. These methods are therefore called sterilization.

Biology: CUET Mock Test - 10 - Question 31

What is the procedure for sterilization in males?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 31

Vasectomy is the procedure used to sterilize males. It involves the removal of a part of vas deferens or it being tied up through an incision on the scrotum.

Biology: CUET Mock Test - 10 - Question 32

In tubectomy, the incision is made through which body part?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 32

Tubectomy is a sterilization procedure for females. In involves tying off the fallopian tube through an incision made in the abdomen or through the vagina.

Biology: CUET Mock Test - 10 - Question 33

In vasectomy, the incision is made through which body part?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 33

Vasectomy is a sterilization procedure for males. It involves tying off the vas deferens through an incision made in the scrotum.

Biology: CUET Mock Test - 10 - Question 34

What is the procedure for sterilization in females?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 34

Tubectomy is the procedure that sterilizes females. It involves removal of a part of fallopian tube. It can also involve tying the tube via an incision in the abdomen.

Biology: CUET Mock Test - 10 - Question 35

Which of the following is prevented by surgical intervention?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 35

Surgical interventions involve the removal/breakage of connection between the site of synthesis and delivery of gamete. Thus, transport of gamete is inhibited.

Biology: CUET Mock Test - 10 - Question 36

What is the frequency of intake required for Saheli to work?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 36

The oral contraceptive called Saheli is different from other hormone-releasing oral pills in the sense that it is non-steroidal. This gives it the advantage of having high dosage content, and thus lesser frequency of intake is needed. It can be taken once a week.

Biology: CUET Mock Test - 10 - Question 37

Which of the following is a brand name for female oral contraceptives in India?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 37

Saheli is a brand name for oral pills in India. It has been widely accepted by females and has fewer side-effects. It is the world’s first non-steroidal contraceptive pill. It has fewer side-effects and is highly effective.

Biology: CUET Mock Test - 10 - Question 38

At what phase of the menstrual cycle should the dosage of pills start?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 38

Pills are oral contraceptives. They should be taken daily for 21 days from the onset of menses. The first pill should be taken in the menstrual phase. This will prevent the release of egg in the next cycle.

Biology: CUET Mock Test - 10 - Question 39

Which of the following hormonal dosage is given as an oral administration to prevent pregnancy?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 39

 Oral administration is hormonal shots of progesterone, estrogen, and their combinations. These are contraceptives for females. Progesterone is normally released by corpus luteum in the case of an unfertilized egg to prevent further development of the uterine wall and to stimulate contractions of the uterus to expel the egg. Progesterone shots do the same job and forces the fertilized egg out in the form of menses.

Biology: CUET Mock Test - 10 - Question 40

What are the contraceptives delivered via the oral cavity called?

Detailed Solution for Biology: CUET Mock Test - 10 - Question 40

Oral contraceptives are delivered via the oral cavity. These come in the form of tablets or pills. They pass through the digestive tract and hence come in capsules that protect it from the acidic environment of the stomach. They are released in the small intestine where it is absorbed through the villi.

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