Tag: life processes: reproduction, growth and development

Questions Related to life processes: reproduction, growth and development

From the names given in the above box how many are not associated with asexual reproduction? 

$\boxed {\begin{matrix} Zoospore, & Conidia, & Tuber, \ Offset. & Pollen & Zygote  \end{matrix}} $

biology life processes: reproduction, growth and development different types of reproduction reproductive health of humans need of family planning

  1. Three

  2. Two

  3. Four

  4. One

Show answer
Correct Option: A
Explanation:

Tuber, Offset and Conidia are asexual spores while Zoospore, Pollen and Zygote are sexually produced.

So, the correct option is 'Three'.

If amount of DNA in sperm cell is 10 picogram, then what will be amount in microsporocyte in an phase of the cell cycle?

biology life processes: reproduction, growth and development different types of reproduction reproductive health of humans need of family planning

  1. 10 pg

  2. 20 pg

  3. 80 pg

  4. 40 pg

Show answer
Correct Option: B
Explanation:

  • Microsporocytes, which are diploid cells capable of undergoing meiosis to form a tetrad (four joined cells) of haploid microspores. The microspores become pollen grains and may eventually separate.
  • As we know the sperm(or male gametes) are haploid. The amount of DNA in this gametes is 10 picogram. Therefore, the amount of DNA in microsporocyte will be double i.e, 20 picograms.

So, the correct answer is " 20 pg ". 

Assertion : Asexual reproduction is also called blastogenesis.

Reason : In asexual reproduction there is no formation and fusion and fusion of gametes.

biology life processes: reproduction, growth and development different types of reproduction reproductive health of humans need of family planning

  1. Both Assertion and Reason are true and Reason is a correct explanation of Assertion

  2. Both Assertion and Reason are true but Reason is not a correct explanation of Assertion

  3. Assertion is true but Reason is false

  4. Both Assertion and Reason are false

  5. Assertion is false but reason is true.

Show answer
Correct Option: B
Explanation:

Development of an organism from non-sexual reproductive units like buds fragments etc is called blastogenesis. In asexual reproduction there is no formation and fusion of gametes.

The uniparental reproduction is called _______ reproduction while biparental reproduction is termed _________ reproduction. Higher organisms mostly show ________ reproduction.

biology life processes: reproduction, growth and development different types of reproduction reproductive health of humans need of family planning

  1. Sexual, asexual, sexual

  2. Asexual, sexual, asexual

  3. Asexual, sexual, sexual

  4. Sexual, asexual, asexual

Show answer
Correct Option: C
Explanation:

Asexual reproduction is a type of reproduction which involves a single parent. The offsprings are genetically identical to each other and to the parent. All prokaryotes and some eukaryotes reproduce this way. Sexual reproduction involves two parents. In sexual reproduction, parents produce reproductive cells—called gametes—that unite to form an offspring. Sexual reproduction is by far the most common life cycle in eukaryotes, for example, animals and plants.

Thus, the correct option is 'Asexual, sexual, sexual.'

Why asexual reproduction is sometimes disadvantageous?

biology life processes: reproduction, growth and development different types of reproduction reproductive health of humans need of family planning

  1. It allows animals that do not move around to produce offspring without finding mates

  2. It allows an animal to produce many offspring quickly

  3. It saves the time and energy of gamete production

  4. It produces genetically uniform populations

Show answer
Correct Option: D
Explanation:

Asexual reproduction is a type of reproduction by which offspring arise from a single organism, and inherit the genes of that parent only; it does not involve the fusion of gametes, and almost never changes the number of chromosomes. It produces genetically uniform populations.

So, the correct option is 'Option D'.