Latest Science Questions For 12th Grade Biology! Quiz
Biology is the branch of science dealing with the study of life. It describes the characteristics, classification, and behaviors of organisms, how species come into existence, and the interactions they have with each other and with the environment. Easy definition huh? Let's see if this quiz is as easy!
Questions and Answers
- 1.
Which of following cause changes in perception, thought, emotion and consciousness?
- A.
Narcotics
- B.
Sedatives
- C.
Hallucinations
- D.
None
Correct Answer
C. HallucinationsExplanation
Hallucinations cause changes in perception, thought, emotion, and consciousness. Hallucinations are sensory experiences that occur without any external stimuli. They can involve seeing, hearing, smelling, or feeling things that are not actually present. These false perceptions can greatly alter one's perception of reality, leading to changes in thought processes, emotions, and overall consciousness.Rate this question:
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- 2.
Which of following comes from a mushroom?
- A.
Mescaline
- B.
Psilocin
- C.
Marijuana
- D.
None
Correct Answer
B. PsilocinExplanation
Psilocin is a compound that is naturally found in certain species of mushrooms, particularly those belonging to the psilocybe genus. When ingested, psilocin acts as a hallucinogenic substance, affecting serotonin receptors in the brain and causing altered perception, mood changes, and hallucinations. Mescaline, on the other hand, is a psychoactive compound found in certain cacti, such as peyote and San Pedro. Marijuana, commonly known as cannabis, is derived from the Cannabis plant, not mushrooms. Therefore, the correct answer is Psilocin.Rate this question:
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- 3.
Comparable to angiosperms, which of the following algae exhibits diplontic life cycle?
- A.
Spirogyra
- B.
Ectocarpus
- C.
Polysiphonia
- D.
Fucus
Correct Answer
D. FucusExplanation
Fucus exhibits a diplontic life cycle, which means that the dominant and multicellular phase of its life cycle is the diploid (2n) phase. In this life cycle, the haploid (n) gametes are produced through meiosis, fuse to form a diploid zygote, and then develop into a diploid organism. This is in contrast to a haplontic life cycle, where the dominant phase is haploid, or alternation of generations life cycle, where both haploid and diploid phases are multicellular and independent. Spirogyra, Ectocarpus, and Polysiphonia do not exhibit a diplontic life cycle.Rate this question:
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- 4.
Isogamous condition with non-flagellated gametes is found in
- A.
Chlamydomonas
- B.
Spirogyra
- C.
Volvox
- D.
Fucus
Correct Answer
B. SpirogyraExplanation
Spirogyra exhibits an isogamous condition with non-flagellated gametes. Isogamy refers to the condition where the gametes are morphologically similar in size and shape. In Spirogyra, both the male and female gametes are non-flagellated and have a similar appearance. This means that they do not possess flagella for movement. In contrast, Chlamydomonas exhibits isogamy with flagellated gametes, Volvox exhibits oogamy with flagellated sperm, and Fucus exhibits oogamy with non-flagellated sperm. Therefore, Spirogyra is the only option that fits the given condition.Rate this question:
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- 5.
Besides paddy fields, cyanobacteria are also found inside vegetative part of
- A.
Pinus
- B.
Cycas
- C.
Equisetum
- D.
Psilotum
Correct Answer
B. CycasExplanation
Cycas is a type of plant that belongs to the gymnosperm group. Cyanobacteria are known to be present inside the vegetative part of Cycas, along with paddy fields. This suggests that Cycas provides a suitable environment for the growth and survival of cyanobacteria.Rate this question:
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- 6.
Megasporangium is equivalent to
- A.
Embryo sac
- B.
Fruit
- C.
Nucellus
- D.
Ovule
Correct Answer
D. OvuleExplanation
The correct answer is ovule. The term "megasporangium" refers to the structure within the ovule that contains the megaspore, which develops into the female gametophyte or embryo sac. The ovule is a crucial part of the reproductive system in plants, as it contains the female reproductive cells and eventually develops into a seed after fertilization. The other options, such as embryo sac, fruit, and nucellus, are not equivalent to megasporangium and do not accurately represent its function or structure.Rate this question:
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- 7.
Two adjacent filaments of Spirogyra affinis each 10 cells participating in reproduction. How many new Spirogyra plants are produced during sexual reproduction?
- A.
5
- B.
10
- C.
20
- D.
40
Correct Answer
B. 10Explanation
During sexual reproduction in Spirogyra affinis, two adjacent filaments each with 10 cells participate. Each cell in one filament undergoes conjugation with a corresponding cell in the other filament, resulting in the formation of zygotes. Since there are 10 cells in each filament, there will be a total of 10 zygotes formed. Each zygote develops into a new Spirogyra plant, so the correct answer is 10.Rate this question:
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- 8.
Which one pair of examples will correctly represent the grouping Spermatophyta according to one of the schemes of classifying plants:
- A.
OptionAcacia, Sugarcane 1
- B.
Pinus, Cycas
- C.
Rhizopus, Triticum
- D.
Ginkgo, Pisum
Correct Answer
D. Ginkgo, PisumExplanation
Ginkgo and Pisum are the correct pair of examples that represent the grouping Spermatophyta. Spermatophyta is a group of plants that reproduce through seeds. Ginkgo is a gymnosperm, specifically a Ginkgo biloba tree, which produces seeds that are not enclosed in a fruit. Pisum, on the other hand, is an angiosperm, specifically a pea plant, which produces seeds that are enclosed in a fruit. Both of these examples belong to the Spermatophyta group because they reproduce through seeds.Rate this question:
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- 9.
Haploid brown, hairlike, delicate unicellular outgrowths are:
- A.
Root hairs of Gymnosperms
- B.
Paraphyses of mosses
- C.
Root modules of Pulses
- D.
Rhizoids of fern plants
Correct Answer
D. Rhizoids of fern plantsExplanation
Rhizoids are thin, hairlike structures that grow from the lower surface of fern gametophytes. They serve to anchor the plant to the soil and absorb water and nutrients. Unlike true roots, rhizoids do not have specialized tissues for conducting water and nutrients. They are haploid, meaning they have only one set of chromosomes, which is characteristic of the gametophyte generation in ferns. This distinguishes them from the other options, which are not unicellular and do not have the same characteristics as rhizoids.Rate this question:
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- 10.
Which one of the following in Spirogyra is different based on its nucleus?
- A.
Zygospore
- B.
Azygospore
- C.
Aplanospore
- D.
Akinete
Correct Answer
A. ZygosporeExplanation
The correct answer is Zygospore. In Spirogyra, the zygospore is different based on its nucleus because it is formed by the fusion of two gametes, each with its own nucleus. This fusion results in the formation of a zygote with a diploid nucleus. In contrast, the other options (Azygospore, Aplanospore, Akinete) do not involve the fusion of gametes and therefore do not have a different nucleus.Rate this question:
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- 11.
Which one pair of examples will correctly represent the grouping Spermatophyta according to one of the schemes of classifying plants:
- A.
OptionAcacia, Sugarcane 1
- B.
Pinus, Cycas
- C.
Rhizopus, Triticum
- D.
Ginkgo, Pisum
Correct Answer
D. Ginkgo, PisumExplanation
Ginkgo and Pisum are the correct pair of examples that represent the grouping Spermatophyta according to one of the schemes of classifying plants. Spermatophyta is a division of plants that includes those with seeds. Ginkgo is a gymnosperm, specifically a Ginkgo biloba tree, which produces seeds in cones. Pisum is an angiosperm, specifically the pea plant, which produces seeds in pods. Both of these examples belong to the Spermatophyta group, making them the correct pair.Rate this question:
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- 12.
Which one pair of examples will correctly represent the grouping Spermatophyta according to one of the schemes of classifying plants:
- A.
OptionAcacia, Sugarcane 1
- B.
Pinus, Cycas
- C.
Rhizopus, Triticum
- D.
Ginkgo, Pisum
Correct Answer
D. Ginkgo, PisumExplanation
Ginkgo and Pisum are the correct pair of examples that represent the grouping Spermatophyta. Spermatophyta is a group of plants that produce seeds for reproduction. Ginkgo is a type of gymnosperm that produces seeds in cones, while Pisum is a type of angiosperm that produces seeds in pods. Both of these examples belong to the Spermatophyta group and represent different types of seed-producing plants.Rate this question:
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- 13.
Which one of the following in Spirogyra is different based on its nucleus?
- A.
Zygospore
- B.
Azygospore
- C.
Aplanospore
- D.
Akinete
Correct Answer
A. ZygosporeExplanation
The correct answer is Zygospore. Zygospore is different from the other options based on its nucleus because it is a diploid structure formed by the fusion of two haploid gametes. In contrast, Azygospore, Aplanospore, and Akinete are all haploid structures that are formed through various mechanisms of asexual reproduction in Spirogyra.Rate this question:
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- 14.
Which one pair of examples will correctly represent the grouping Spermatophyta according to one of the schemes of classifying plants:
- A.
OptionAcacia, Sugarcane 1
- B.
Pinus, Cycas
- C.
Rhizopus, Triticum
- D.
Ginkgo, Pisum
Correct Answer
D. Ginkgo, PisumExplanation
Ginkgo and Pisum are the correct pair of examples that represent the grouping Spermatophyta. Spermatophyta is a group of plants that reproduce through seeds. Ginkgo is a type of gymnosperm that produces seeds, while Pisum is a type of angiosperm that also produces seeds. The other options do not correctly represent the grouping Spermatophyta as they include examples that are not seed-producing plants.Rate this question:
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