Questions
1
Which of the following statements, support the view that elaborate sexual reproductive process appeared much later in the organic evolution.
i. Lower groups of organisms have simpler body design
ii. Asexual reproduction is common in lower groups
iii. Asexual reproduction is common in higher groups of organisms
iv. The high incidence of sexual reproduction in angiosperms and vertebrates
i. Lower groups of organisms have simpler body design
ii. Asexual reproduction is common in lower groups
iii. Asexual reproduction is common in higher groups of organisms
iv. The high incidence of sexual reproduction in angiosperms and vertebrates
Answer:ii and iv
2
Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual reproduction because:
Answer: Gametes of parents have qualitatively different genetic composition
3
Planaria’s most remarkable characteristics are its ability to
Answer: Regenerate
6
When living tissue from a plant is extracted and placed in a medium, it is called ______
Answer:Explant
9
___________ refers to an asexual reproduction process wherein genetically identical copies of individual plants are produced
Answer:Clonal Propagation
11
The property of an undifferentiated cell that has the potential to develop into an entire plant is called
Answer: Budding
12
The development of root and shoot in tissue culture is determined by ______
Answer: Auxin and cytokinin ratio
13
Which among the following is a unicellular organism that reproduces by budding:
Answer: Yeast
14
Which among the following does not reproduce by spore formation:
Answer:Yeast fungus
15
The rapid spreading of bread mould on slices of bread are due to:
(i) Presence of large number of spores in air
(ii) Presence of large number of thread-like branched hyphae
(iii) Presence of moisture and nutrients
(iv) Formation of round shaped sporangia
(i) Presence of large number of spores in air
(ii) Presence of large number of thread-like branched hyphae
(iii) Presence of moisture and nutrients
(iv) Formation of round shaped sporangia
Answer: (i) and (iii)
16
The asexual reproduction in the Spirogyra involves:
Answer:Division of a cell into many cells
17
Reason for the greater similarities among the offsprings produced by asexual reproduction, is:
(i) Asexual reproduction involves only one parent
(ii) Asexual reproduction involves two parents
(iii) Asexual reproduction involves gametes
(iv) Asexual reproduction does not involve gametes
(i) Asexual reproduction involves only one parent
(ii) Asexual reproduction involves two parents
(iii) Asexual reproduction involves gametes
(iv) Asexual reproduction does not involve gametes
Answer:(i) and (iv)
18
The process of the division of cell into several cells during reproduction in Plasmodium is termed as:
Answer:Multiple fission
19
The number of chromosomes in parents and offsprings of a particular species remains constant due to:
Answer:Halving of chromosomes during gamete formation
20
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
