Name an Animal in Which Individuals Can Change Sex. What Does this Indicate? - Science


Name an animal in which individuals can change sex. What does this indicate?



 Snail is an example of an animal that can change sex. This indicates that sex in snails is not determined genetically.

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Chapter 4: Heredity and Evolution - Exercise 1 [Page 192]


Lakhmir Singh Class 10 Biology (Science)
Chapter 4 Heredity and Evolution
Exercise 1 | Q 20.2 | Page 192

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List two reasons for the appearance of variations among the progeny formed by sexual reproduction

If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?

Which of the processes, sexual reproduction or asexual reproduction, bring about maximum variations in the offsprings?

Name one variation in humans connected with ears.


How do variations arise in organisms? "Variation is useful for the survival of species." Justify this statement with the help of an example.

Plants like banana, rose, jasmine, orange have lost the capacity to produce ______ 

The part of the flower which is present in the centre of the flower is ______ 

In the following Figure, parts A, B, and C are sequentially 

In the following Question, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Variation is high in sexually reproducing organisms compared to asexually reproducing organisms.

Reason: Inaccuracies during DN A copying give rise to variation.

In the list of organisms given below, those that reproduce by the asexual method are

  1. banana
  2. yeast
  3. dog
  4. Amoeba 

Exchange of genetic material takes place in

The diagram shown below depicts pollination. Choose the options that will show a maximum variation in the offspring.

How are variations useful for species if there is drastic alteration in the niches?

Give reason for the following:

During reproduction inheritance of different proteins will lead to altered body designs.

  • Assertion: The probability of survival of an organism produced through sexual reproduction is more than that of an organism produced through asexual mode.
  • Reason: Variations provide advantages to individuals for survival.


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