Reproduction in Organisms Test

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Reproduction in Organisms Test - 27

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Question 1
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Factors responsible for the rapid spread of bread mould on slices of bread are:
(i) Large number of spores
(ii) Availability of moisture and nutrients in bread
(iii) Presence of tubular branched hyphae
(iv) Formation of round-shaped sporangia

A
(i) and (iii)

B
(ii) and iv)

C
(i) and (ii)

D
(iii) and (iv)

Solution

In the presence of moisture and nutrients, bread mould (a kind of fungus) shows enormous growth and produces a large number of spores. The spores germinate when conditions are ambient and produce new hyphae. Rhizopus stolonifer is the common bread mould.
Question 2
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Both hens and frogs are ______________ animals.

A
Oviparous

B
Viviparous

C
Ovoviviparous

D
Hens oviparous and frog ovoviviparous

Solution

Oviparous animals are animals that reproduce by laying eggs. Hens and frogs both lay eggs and hence are oviparous.
Viviparous animal gives directly birth to young ones, eg. humans.
The ovoviviparous animal lays eggs but the embryo within the egg is developed in the mother's body, eg. snakes.
So, the correct answer is option A.
Question 3
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Which one among the following reason for the appearance of variations among the progeny formed by sexual reproduction?

A
Sexual reproduction involves two parents with different sets of characters

B
The gene combinations are different in gametes which are fertilised

C
Asexual reproduction involves two parents with different sets of characters

D
Both A and B

Solution

The process of sexual reproduction involved two parents, each contributing one gamete. As two parents with different sets of characters are involved, it results in variations. As there are two gametes, they virtually never have exactly the same combination of genes and hence, this results in the formation of different gene combination once fertilized.
Thus, the correct answer is option D.
Question 4
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A chain of yeast cells forms because

A
yeast cells do not separate immediately after budding

B
Daughter cells are unable to survive without parent calls

C
Buds reproduce as soon as they are formed

D
Daughter cells stick together with the help of mucus
Solution
Newly formed bud on parent yeast can detach from the parent body and grows independently as a new individual or may remain attached to parent body, forming chain of cells.
So the correct answer is option A.
Question 5
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Select the correct statement for the process of budding in Yeast :
(I) A bud arises from a particular region on a parent body.
(II) A parent cell divides into two daughter cells, here the parental identity is not lost.
(III) Before detaching from the parent body a bud may form another bud.
(IV) A bud when detaches from the parent body grows into a new individual.

A
I, II and III

B
II, III and IV

C
III, IV and I

D
IV, I and II
Solution
- Budding is a type of asexual reproduction, in which a small outgrowth can arise from any part of the parent body called a bud and parental identity is not lost.
- The nucleus divides to form two daughter nuclei, of which one passes into the bud.
- The bud now detaches from the parent body and grows independently as a new individual or may remain attached to the parent body, forming a chain of cells.
So the correct answer is option B.
Question 6
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The budding in yeast is illustrated by the diagram :

A
A

B
B

C
C

D
D
Question 7
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Which of the following statements is not true about budding in yeast?

A
A bud may arise from any part of the parent cell.

B
Before detaching from the parent body a bud may form another bud.

C
A bud may separate from the parent body and develops into a new individual.

D
A bud arises from a particular region on a parent body.
Solution
- In this type of asexual reproduction, a small outgrowth can arise from any part of the parent body called a bud.
- The nucleus divides to form two daughter nuclei, of which one passes into the bud.
- The bud can now detach from the parent body and grow independently as a new individual or may remain attached to the parent body, forming a chain of cells.
So the correct answer is option D.
Question 8
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What is the basic difference between binary fission and budding?

A
In budding, the parent's identity is lost, while in binary fission, it is maintained.

B
In binary fission, the parent's identity is lost, while it is maintained in budding.

C
There is a fusion of daughter cells in binary fission while in budding, genetically non-identical daughter cells are produced.

D
In binary fission, two dissimilar individuals (daughter cells) are formed while in budding, daughter and parent cells are similar.
Solution
- Binary fission and budding both are the modes of asexual reproduction. But in binary fission, the parent cell splits into two daughter cells and loses its identity.
- Whereas in budding, the parent cell first produces an outgrowth or bud which gets detached after maturity and survives as an individual. The parent identity is thus retained.
- In binary fission, the cytoplasm divides evenly whereas in budding cytoplasm divides unevenly.
  Hence, the correct answer is B.
Question 9
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Binary fission in amoeba is illustrated by the diagrams

A
A, B, C, D

B
A and C

C
B and C

D
B and D
Question 10
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In an examination Raj drew diagrams of four stages of binary fission in Amoeba as shown below. However, he was not awarded full marks as one of the stages was incorrectly drawn. The incorrectly drawn stage is:

A
I

B
II

C
III

D
IV

Solution

Two equal-sized daughter cells are formed at the end of binary fission.
Stage IV is wrongly drawn in the diagram as the daughter cells shown are of unequal size.
So the correct answer is option D.