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Biology 12 Past Paper 2022 | Notely

HomePast papersBiology 122022

All Biology 12 papers

Class 12 · Past paper

Biology 12 past paper 2022

75 published questions in this index. The full practice view lets you work through them and track your own attempts.

29 MCQs46 written questionsPractise this paper

Question index

1
A man has hemophilia. Which statement correctly describes the inheritance?
MCQ1 marksannual
1
If an injury tore a small hole in the membrane surrounding the lungs, what effect on lung function is expected?
Part B3 marksannual
1
How is a piece of DNA amplified through PCR? Explain the process in detail.
Part C7 marksannual
1
Which tRNA can bind at mRNA codon **UAC**?

This is a skimmable index, not a replacement for the study surface. Open the practice view to answer questions and use the linked study material.

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1

What advantage does **uric acid** offer as a nitrogenous waste in arid environment?

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2

When a frog flips out its tongue to catch an insect flying past, it is showing which type of behavior?

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2

If blood pressure in the afferent arteriole leading to glomerulus decreased, how would the rate of blood filtration within Bowman's capsule be affected? Explain briefly.

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2

Describe techniques for the improvement of yield in crops and fruits.

Part C6 marksannual

2

Why is an internal location of gas exchange tissue advantageous for terrestrial animals? List properties of respiratory surfaces.

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2

Explain the concept of **multiple alleles** giving **ABO blood group** as an example.

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3

When the pituitary gland releases growth hormone (GH), what is the effect on the liver?

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3

Which of the following structures produce the fluid protein of semen?

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4

Which of the following would increase the rate of heat exchange between an animal and its environment?

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4

Describe the basic pathway of information flow through neurons that causes one to turn one's head when someone calls their name.

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4

Describe how the process of gastrulation takes place in humans.

Part C4 marksannual

4

What does the cat show when it runs for its food dish upon hearing the food can opener?

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4

Why is it nearly impossible to stop a reflex action from taking place? Write down the fundamental parts of a typical reflex arc.

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4

Albinism (lack of pigment) in man is caused by a recessive gene. If normal parents have an albino child, what is the probability that their next child be normal for color?

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5

Homeostasis of blood osmotic pressure is maintained by which organ(s):

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5

Critically analyze the inheritance of **hemophilia**, **colorblindness** and **muscular dystrophy**.

Part B3 marksannual

5

Why are there so many variations of grain color in wheat? Explain.

Part C4 marksannual

5

What type of heat exchange is promoted by **vasodilation**?

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5

What are the phenotypes and genotypes of parents of a colorblind son and non-carrier daughter?

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5

How are **joints** classified on the basis of their mobility? Write about any one common disorder of the skeleton.

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6

Emphysema is a condition that results in the destruction of alveoli in the lungs. What effect would this have on the body?

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6

What is **corpus luteum**? Briefly explain its role in menstrual cycle.

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6

Explain the process of repair of simple fracture of bone.

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6

What is **miscarriage**? What are the possible causes of miscarriage?

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7

Immediate source of energy for muscle contraction is:

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7

List some changes that occur at cellular level during aging.

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7

A trait whose alleles are present in both male and female but expresses more in one sex than other:

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7

Which types of cells have been proposed as **fourth germ layer**? What structures are derived from it?

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8

Reflex actions below the neck are under the control of:

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8

Why does the length of mRNA formed in eukaryotes shorten when it goes to the cytoplasm for translation? How is its message protected?

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8

Organisms of the same species inhabiting in space and time form a:

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8

Differentiate between: a. **Intron** and **exon** b. **Heterochromatin** and **Euchromatin** c. **Nucleosome** and **Primosome**

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9

Glands of male reproductive system in human are:

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9

How is atmospheric nitrogen fixed to be utilized by plants?

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9

The present giraffe has a long neck as compared to its ancestors. Lamarck believed it could be due to:

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9

Explain **genetic drift**. Write down its two causes.

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10

What is **succession**? How might the early species help the arrival of late species?

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10

Crumpled leaves like structure are found in $\dots$ stage of xerarch succession.

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10

If a forest near a lake is cut down, how will the quality of water be damaged? Also list non-conventional energy sources.

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11

What is the basic principle of Gel Electrophoresis? Write down its two applications.

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11

Myoglobin occurs in:

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11

What is cystic fibrosis? How is gene therapy used to cure it?

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12

Production of more individuals than the environment can support leads to:

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12

Write down three main steps involved in any DNA sequencing method.

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12

$Na^{+}-K^{+}$ ATPase pump is important for:

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12

What is meant by **tissue culture**? Write about two techniques used for animal cell culture.

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13

Which of the following is an environmental buffer?

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13

How are microbes utilized for energy production?

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13

Ovulation is stimulated by the sharp increase of which of the following hormones?

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13

Explain **integrated disease management**.

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14

A genome is a full set of genes in an:

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14

Explain $XO$-$XX$ type of sex determination with the help of an example.

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14

Specific sequences of four or six nucleotides arranged symmetrically in reverse order where restriction enzymes work are known as:

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14

Why is human male referred as heterogametic? Explain with the help of a cross.

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15

Study of proper utilization of economically important domesticated animal is known as:

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15

List the hormones of the anterior pituitary gland.

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15

During **PCR** which enzyme is used to do polymerization of DNA fragments?

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15

What are **hormones**? Give their classification on the basis of chemical nature.

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16

What is a **vaccine**? Give its importance.

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16

The pancreas releases which of the following hormones?

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16

What are **biological rhythms**? How are they important to man?

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17

The change of behavior by life experiences is called:

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17

Write three main causes of male infertility in humans.

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17

Which of the following cells are involved in soft callus formation during repair of bones?

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17

Write three causes of infertility in human females.

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18

Name the three germ layers. Which body organs are derived from these germ layers?

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18

What is **cleavage**? Write about two patterns of cleavage.

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19

Draw and label the water cycle.

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19

What is an ecological pyramid? Explain any two types.

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20

Describe the structure and function of voice box in humans.

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20

Write any three roles of microbes in human welfare.

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