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Science (English Medium) Class 12 - CBSE Important Questions for Biology

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Mention any one symptom of the diseases/disorders named above.

 

 
Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Concept of Reproductive Health

Explain one application of the following:
Amniocentesis

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Concept of Reproductive Health

Explain one application of the following:
ZIFT

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Infertility

Prepare a poster for the school program depicting the objectives of:
"Reproductive and Child Health Care Programme".

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Concept of Reproductive Health

Name the kind of diseases/disorders and any two symptoms that are likely to occur in humans if Mutation in the gene that codes for an enzyme phenylalanine hydroxylase occurs.

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Concept of Reproductive Health

Name the kind of diseases/disorders and any two symptoms that are likely to occur in humans if The karyotype is XXY

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Concept of Reproductive Health

An infertile couple was advised to undergo In vitro fertilization by the doctor. Out of the options given below, select the correct stage for transfer to the fallopian tube for successful results.

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Infertility

Given below are four contraceptive methods and their modes of action. Select the correct match:

Method Mode of action
a) Condom (i) Ovum not able to reach Fallopian tube
b) Vasectomy (ii) Prevents ovulation
c) Pill (iii) Prevents sperm reaching the cervix
d) Tubectomy (iv) Semen contains no sperms
Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Birth Control

Trace the events from copulation to zygote formation in a human female.

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Infertility

‘An HIV patient normally doesn't die of ‘AIDS’, but death is caused due to many other infections.’ Do you agree with the statement? Give explanatory reasons in support of your answer.

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Sexually Transmitted Diseases (STD) or Sexually Transmitted Infections (STI)

Given below are four aspects of Reproductive Health in Column A and their related information in Column B:

  Column A   Column B
S. No. Terms used in Reproductive Health S. No. Significant information
(A) MTP (i) Analysing fetal cells from amniotic fluid of the foetus
(B) Amniocentesis (ii) Legalised in 1971
(C) Saheli (iii) Programme initiated in 1951
(D) Family Planning (iv) Non-steroidal oral Planning contraceptive

Select the correct match from the following options:

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Concept of Reproductive Health

A pregnant human female was advised to undergo MTP. It was diagnosed that the fetus she was carrying had developed from a zygote having 45 chromosomes with only one X chromosome.

  1. What is this condition called and how does it arise?
  2. Why was she advised to undergo MTP?
Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Induced Abortion or Medical Termination of Pregnancy (MTP)

With the help of a flow chart, illustrate how an infected animal cell can survive while viruses are being replicated or released.

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Sexually Transmitted Diseases (STD) or Sexually Transmitted Infections (STI)

Placed below are case studies of some couples who were not able to have kids. These couples are not ready for adoption or taking gametes from donors. After thoroughly examining the cases, which Assisted Reproductive Technology will you suggest to these couples as a medical expert? Explain briefly with justification of each case.

Couple Test reports of
Female partner
Test reports of male partner
Couple 1 Normal reports Normal sperms in testes, Missing connection
in epididymis and Vas deferens.
Couple 2 Blockage in the fallopian tube Normal reports
Couple 3 Normal reports Poor semen parameters in terms of count,
motility and morphology.
Couple 4 low ovarian reserve Normal reports
Couple 5 Sterilization in male Morphologically abnormal sperms
Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Infertility

Given below are certain situations. Analyse the situation and suggest the name of suitable contraceptive device along with mode of action.

Situation Requirement of contraceptive for - Name of contraceptive device Mode of action
1 blocking the entry of sperms through cervix ______ ______
2 spacing between children ______ ______
3 effective emergency contraceptive ______ ______
4 terminal method to prevent any more pregnancy in female ______ ______
5 sterilization in male ______ ______
Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Birth Control

The following is well-known abbreviation, which have been used in this chapter. Expand to its full form:

HIV

Appears in 1 question paper
Chapter: [3] Reproductive Health
Concept: Sexually Transmitted Diseases (STD) or Sexually Transmitted Infections (STI)

A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.

Appears in 1 question paper
Chapter: [4] Principles of Inheritance and Variation
Concept: Chromosomal Theory of Inheritance

Explain the relationship between CFC’s and Ozone in the stratosphere.

Appears in 1 question paper
Chapter: [4] Environmental Issues
Concept: Ozone Layer Depletion >> Ozone Depletion in the Stratosphere

Name any two sources of e-Wastes and write two difference ways of their disposal.

Appears in 1 question paper
Chapter: [4] Environmental Issues
Concept: Radioactive Waste Management and E-waste

How have human activities caused desertification? Explain.

Appears in 1 question paper
Chapter: [4] Environmental Issues
Concept: Degradation by Improper Resource Utilisation and Maintenance
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