Dakshana Mock Test Season X Solutions
Dakshana Mock Test Season X Solutions
1] The two daughter cells produced by mitosis are similar, but are they likely to be absolutely genetically identical?
Answer: No, as there could be slight variation in their DNA due to mutation
2] Reason for the greater similarities among the offsprings produced by asexual reproduction, is:
(a) Asexual reproduction involves only one parent
(b) Asexual reproduction involves two parents
(c) Asexual reproduction involves gametes
(d) Asexual reproduction doesn not involve gametes
Answer: (a) and (d)
3] A Planaria worm is cut horizontally in the middle into two halves P and Q such that the part P contains the whole head of the worm. Another Planaria worm is cut vertically into two halves R and S in such a way that both the cut pieces R and S contain half head each. Which of the cut pieces of the two Planaria worms could regenerate to form the complete respective worms?
Answer: P, Q, R and S
4] A complete flower has ____ whorls.
Answer: 4
5] Which of the following statements are true for flowers?
(a) Flowers are always bisexual
(b) They are the sexual reproductive organs
(c) They are produced in all groups of plants
(d) After fertilisation they give rise to fruits
Answer: (b) and (d)
6] Double fertilization means
Answer: Fusion of 1st male gamete with egg cell and 2nd with central cell
7] Match the column.
| Column I | Column II |
| (A) | Ovary | (a) | Seed |
| (B) | Ovule | (b) | Embryo |
| (C) | Egg cell | (c) | Fruit |
Answer: A-c, B-a, C-b
8] The ratio of number of chromosomes in a human zygote and a human sperm is:
Answer: 2:1
9] Which among the following are not the functions of testes at puberty?
(a) Formation of germ cells
(b) Secretion of testosterone
(c) Development of placenta
(d) Secretion of estrogen
Answer: (c) and (d)
10] Tubectomy is carried out by blocking the
Answer: oviduct
11] Immature eggs in female are formed during
Answer: Foetal condition
12] When pure tall and pure dwarf plants are crossed, the F1 generation offsprings are all tall. It supports
Answer: 1st law of Mendelian inheritance
13] The phenotypic ratio in the F-2 generation of a dihybrid cross will be
Answer: 9:3:3:1
14] How many types of gamete can a human female and a human male produce respectively?
Answer: 1 and 2
15] Upon crossing two tall plants(parents), Mendel found some dwarf offsprings. What could be possible genotype of the parent plants?
Answer: Tt & Tt
16] In the human blood grouping, the four basic blood types are
type A, type B, type AB and type O. They are:
Answer: Co-dominant traits
17] A pregnant woman has an equal chance of her baby being blood group A or blood group AB. Which one of the following shows the possible genotypes of the woman and the father of her child?
Answer: IAIA and IBIO
18] 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) and (d)
19] Which of the following statements is correct regarding variations?
Answer: May or may not provide survival advantage
20] Genetic drift is defined as
Answer: Accidental change in gene frequency
21] The famous spark-flask experiment was conducted by
Answer: Urey & Miller
22] Which of the following pair of organs is not homologous?
Answer: Wings in butterfly and bat
23] The organs present in two organisms indicate that they are derived from the same ancestor, they are:
Answer: Homologous organs
24] What could be the reason for the fossil of an organism to be found in the deeper layers of the earth?
Answer: The extinction of organism has occurred thousands of years ago
25] Which of the following statement is incorrect?
Answer: Humans have evolved from chimpanzees
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