Some organisms are considered to be immortal such as

(1) Amoeba

(2) Drosophila

(3) Pistia

(4) Penicillium

Subtopic:  Introduction |
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Life span of parrot is 

(1) 140 years

(2) 60 years

(3) 80 years

(4) 40 years

Subtopic:  Introduction |
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Mark the correct statement ( with respect to reproduction)

1. A biological process to produce new offsprings

2. Enables the continuity of the species, generation after generation

3. Incorporates genetic variations and makes the basis of evolution

4. More than one option is correct

Subtopic:  Reproduction | Introduction |
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Life span of an organism

1. Does not include the phase of senescence

2. Is not necessarily correlated with body size of organism

3. Is very short in a unicellular organism like Amoeba

4. Includes accidental death of organism also

Subtopic:  Introduction |
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These are two statements related to sexual reproduction :
(I) In both plants and animals, hormones are responsible for the transitions between the three phases.
(II) Interaction between hormones and certain environmental factors regulate the reproductive processes and the associated behavioural expressions of organisms.
Options :
1. Both (I) and (II) is correct
2. Only (I) is correct
3. Only (II) is correct
4. Neither (I) nor (II) is correct

Subtopic:  Introduction |
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Select incorrect statement with respect to life span.

a. It is the period from the reproductive phase to the senescent phase.

b. Life spans of organisms are not necessarily correlated with their sizes.

c. No individual is immortal, whether single-celled or multi-celled.

d. The life span of banana tree is 25 years.

1. a & d

2. a & b

3. a & c

4. c & d

Subtopic:  Introduction |
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A : All organisms have to reach a certain stage of growth and maturity in their life, before they can reproduce sexually.
B : Male and female gametes must be physically brought together to facilitate syngamy :-
1. A - correct B - incorrect
2. Both A and B are correct
3. Both A and B are incorrect
4. A - incorrect B – correct

Subtopic:  Introduction | Sexual Reproduction |
 79%
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Read the following statements
Statement A : Reproduction enables continuity of the species, generation after generation

Statement B : Zygote is the vital link that ensures continuity of species between organisms of one generation and the next.

Choose the correct option.

(1) Both the statements are incorrect

(2) Only statement A is correct

(3) Only statement B is correct

(4) Both the statements are correct

Subtopic:  Introduction | Events during Sexual reproduction |
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