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Draw a diagram of the mature embryo sac of an angiospermic ovule and label any four parts in it.
Concept: Essential Parts of Flower: Gynoecium > Development of Female Gametophyte or Embryo Sac
Briefly explain the events of fertilisation and implantation in an adult human female.
Concept: Fertilization and Implantation
Comment on the role of placenta as an endocrine gland.
Concept: Pregnancy and Embryonic Development
Where does fertilization occur in humans? Explain the events that occur during this process.
Concept: Fertilization and Implantation
A couple where both husband and wife are producing functional gametes, but the wife is still unable to conceive, is seeking medical aid. Describe any one method that you can suggest to this couple to become happy parents
Concept: Embryo Development Upto Blastocyst Formation
Draw a labeled diagram of a mature embryo sac.
Concept: Embryo Development Upto Blastocyst Formation
Name the group of genes that have been identified in normal cells that could lead to cancer. How do these genes cause cancer?
Concept: Sexually Transmitted Diseases (STD)
Indiscrimate diagnostic practices using X-rays etc., should be avoided. Give one reason.
Concept: Sexually Transmitted Diseases (STD)
Write the complete name of the diagnostic test for AIDS.
Concept: Sexually Transmitted Diseases (STD)
Given below are Column A with a list of certain Assisted Reproductive Technologies (ART) and in Column B the procedures followed during ART:
| Column A | Column B | ||
| S. No. | Names of ART | S. No. | Procedures |
| (A) | GIFT | (i) | Transfer of ovum from a donor into the fallopian tube of another female. |
| (B) | ICSI | (ii) | Transfer of semen from the donor into the vagina of the female. |
| (C) | ZIFT | (iii) | Injecting sperm directly into the ovum. |
| (D) | IUI | (iv) | Transfer of early embryos into the fallopian tube. |
Choose the option where ART correctly matches with the procedure.
Concept: Infertility
Assertion (A): Determining the sex of an unborn child followed by MTP is an illegal practice.
Reason (R): Amniocentesis is a practice to test the presence of genetic disorders also.
Concept: Medical Termination of Pregnancy (MTP)
How many chromosomes do drones of honey bees possess?
Concept: Chromosomal Theory of Inheritance
List two advantages of the use of unleaded petrol in automobiles as fuel.
Concept: Prevention of Air Pollution
How does the gene 'I' control ABO blood groups in humans ? Write the effect the gene has on the structure of red blood cells.
Concept: Extensions of Mendelian Genetics (Deviation from Mendelism)
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ
Concept: Sex Determination
A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.
Concept: Genetic Disorders
Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900. Give three reasons for the delay in accepting his work.
Concept: Mendelian Inheritance - Mendel’s Law of Heredity
State a difference between a gene and an allele.
Concept: Extensions of Mendelian Genetics (Deviation from Mendelism)
Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.
Concept: Genetic Disorders
Name any two places where it is essential to install electrostatic precipitators. Why is it required to do so?
Concept: Prevention of Air Pollution
