Please see below Case Study MCQ Questions Chapter 9 Heredity And Evolution Class 10 Science. These MCQ Questions with Answers for Case study have been designed as per the latest syllabus and examination guidelines of Class 10 Science. Cased Study Based MCQ Questions for Class 10 Science are expected to come in the upcoming exams. We have provided a lot of case studies for all chapters in standard 10 science. Please solve the MCQ Questions and compare with the answers provided by our teachers.
Chapter 9 Heredity And Evolution Class 10 Science Case Study MCQ Questions
Most human chromosomes have a maternal and a paternal copy, and we have 22 such pairs. But one pair, called the sex chromosomes, is odd in not always being a perfect pair. Women have a perfect pair of sex chromosomes, both called X. But men have a mismatched pair in which one is a normal-sized X while the other is a short one called Y. So women are XX, while men are XY.
Question. In human males, all the chromosomes are paired perfectly except one. These unpaired chromosomes are:
(a) Large chromosome
(b) Small chromosome
(c) Y chromosome
(d) X chromosome
Answer
C
Question. Which of the following determines the sex of a child?
(a) The length of the mother’s pregnancy
(b) The length of time between ovulation and copulation
(c) The presence of an X chromosome in an ovum
(d) The presence of a Y chromosome in a sperm
Answer
D
Question. The process where characteristics are transmitted from parent to offsprings is called:
(a) Variation
(b) Heredity
(c) Gene
(d) Allele
(e) None of the above
Answer
B
Question. Who have a perfect pair of sex chromosomes?
(a) Girls only
(b) Boys only
(c) Both girls and boys
(d) It depends on many other factors
Answer
A
Question. If a normal cell of human body contains 46 pairs of chromosomes then the numbers of chromosomes in a sex cell of a human being is most likely to be:
(a) 60
(b) 23
(c) 22
(d) 40
Answer
B
Question number (a) – (d) are based on the images (A) and (B) given below. Study them and answer the following questions.
(c) Which image shows a common ancestry?
Answer
Image A shows common ancestry
(d) Which image has a common function but different origin?
Answer
Image B i.e., analogous organs have a different origin but common functions.
(a) What term can be used for the structure given in image A?
Answer
Homologous organs
(b) What term can be used for the structure given in image B?
Answer
Analogous organs
A person first crossed pure-breed pea plants having roundyellow seeds with pure-breed pea plants having wrinkledgreen seeds and found that only A-B type of seeds were produced in the F1 generation. When F1 generation pea plants having A-B type of seeds were cross-breed by selfpollination, then in addition to the original round-yellow and wrinkled-green seeds, two new varieties A-D and C-B type of seeds were also obtained.
Question. State whether A and B are dominant traits or recessive traits.
Answer
A (round) and B (yellow) are dominant traits
Question. What are A-D type of seeds?
Answer
Round-green
Question. What are C-B type of seeds?
Answer
Wrinkled-yellow
Question. What are A-B type of seeds?
Answer
Round yellow
Question. Out of A-B and A-D types of seeds, which one will be produced in (i) minimum numbers, and (ii) maximum numbers, in the F2 generation?
Answer
(i) A–D (ii) A–B
