science
Grade-10
Easy
Question
A diplontic life cycle is observed in:
Chlamydomonas
Bryophytes
Algae
All of the above
Chlamydomonas
Bryophytes
Algae
All of the above
Hint:
An informal term for a large and diverse group of photosynthetic eukaryotes.
The correct answer is: Algae
- The diploid life cycle is exhibited by some algae and all phanerogams, or seed-bearing plants.
- Brown alga Fucus has a diploid life cycle. The body of the plant is a diploid thallus. The haploid stage is represented by oogonia and pistils formed by meiosis of the germ cells present in the fertilized egg.
- Oogonia and Antheridia produce eggs and sperm, respectively, which fuse to form diploid zygotes. The fertilized egg (2n) undergoes mitosis into the thallus.
- Other algae that exhibit a diploid life cycle are the green algae Cladophora and Acetabularia, diatoms, and others.
- All seed-bearing plants, namely gymnosperms and angiosperms, exhibit a diploid life cycle.
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Which of the following is a genetically inherited human characteristic that is not affected by any changes in environmental conditions?
I. Skin color
II. Blood group
III. Presence of a dimple
IV. Height
- Traits under discontinuous variation have limited range
- Traits under continuous variation have unlimited range
- Discontinuous variation is due to the influence of genes alone
- Continuous variation is due to the combined effects of genes and environment
Which of the following is a genetically inherited human characteristic that is not affected by any changes in environmental conditions?
I. Skin color
II. Blood group
III. Presence of a dimple
IV. Height
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- Traits under discontinuous variation have limited range
- Traits under continuous variation have unlimited range
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- Continuous variation is due to the combined effects of genes and environment
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What is this definition: 'Differences between organisms caused by environmental factors.'
- Variation is the difference between individuals of same population
- Variation can be caused due to genes or due to environmental factors
What is this definition: 'Differences between organisms caused by environmental factors.'
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- Variation is the difference between individuals of same population
- Variation can be caused due to genes or due to environmental factors
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What is this definition: 'A group of organisms that can reproduce with each other to produce offspring that will also be able to reproduce'?
- Carl Linnaeus is the father of modern taxonomy
- Binomial nomenclature is used to describe the name of the species
- Binomial nomenclature has 2 parts: genus and species (in italics)
- Species is the last and principal part of the taxonomical hierarchy
- Species are group of organisms with similar traits capable of interbreeding and producing future generations
What is this definition: 'A group of organisms that can reproduce with each other to produce offspring that will also be able to reproduce'?
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- Carl Linnaeus is the father of modern taxonomy
- Binomial nomenclature is used to describe the name of the species
- Binomial nomenclature has 2 parts: genus and species (in italics)
- Species is the last and principal part of the taxonomical hierarchy
- Species are group of organisms with similar traits capable of interbreeding and producing future generations
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What is this definition: 'Differences between organisms caused by differences in the DNA they inherit from their parents'?
- Even identical twins have difference in genetic makeup. This is due to genetic variation.
- Variation causes difference in traits such as height, eye color, skin color and many more
- Variation can be continuous or discontinuous
- Variation is due to genes or due to combined influence of genes and environment
What is this definition: 'Differences between organisms caused by differences in the DNA they inherit from their parents'?
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- Even identical twins have difference in genetic makeup. This is due to genetic variation.
- Variation causes difference in traits such as height, eye color, skin color and many more
- Variation can be continuous or discontinuous
- Variation is due to genes or due to combined influence of genes and environment
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What can cause variation?
- No two individuals of same population is identical. This is due to variation.
- Variation causes difference in phenotypes such as height, weight, blood group and many more
- Variation can be continuous or discontinuous
- Variation is due to genes or due to combined influence of genes and environment
What can cause variation?
scienceGrade-10
- No two individuals of same population is identical. This is due to variation.
- Variation causes difference in phenotypes such as height, weight, blood group and many more
- Variation can be continuous or discontinuous
- Variation is due to genes or due to combined influence of genes and environment
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What does variation mean?
- No two individuals of same population is identical. This is due to variation.
- Variation causes difference in traits such as height, eye color, skin color and many more
- Variation can be continuous or discontinuous
- Variation is due to genes or due to combined influence of genes and environment
What does variation mean?
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- No two individuals of same population is identical. This is due to variation.
- Variation causes difference in traits such as height, eye color, skin color and many more
- Variation can be continuous or discontinuous
- Variation is due to genes or due to combined influence of genes and environment
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Which of the following would increase the number of different alleles in a population?
Which of the following would increase the number of different alleles in a population?
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Variation in a trait may be due to the change in genetic material. What do you call this type of change?
- DNA is the genetic material for all organisms
- DNA is made of sequence of nucleic acids
- Gene is the unit of heredity and codes for particular trait
- Change in sequence of nucleic acid is called mutation
- Not all mutations are harmful
Variation in a trait may be due to the change in genetic material. What do you call this type of change?
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- DNA is the genetic material for all organisms
- DNA is made of sequence of nucleic acids
- Gene is the unit of heredity and codes for particular trait
- Change in sequence of nucleic acid is called mutation
- Not all mutations are harmful
