Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Phloem being sandwitched between xylem
- B. Transverse splitting of vascular bundle
- C. Longitudinal splitting of vascular bundle
- D. Xylem being sandwitched between phloem
Explanation: A bicollateral vascular bundle is characterized by the xylem being sandwiched between the phloem.
Correct answer: Xylem being sandwitched between phloem- A. Cucurbita
- B. Helianthus
- C. Althaea
- D. Salvia
Explanation: Angular collenchyma is a type of collenchyma, a supportive tissue found in plants, that is characterized by thickenings in the cell walls…
Correct answer: Cucurbita- A. Cucumber
- B. Guava
- C. Brinjal
- D. Plum
Explanation: The ovary in the flowers of a plum is half-inferior. The receptacle is embedded or surrounded by a half-inferior ovary.
Correct answer: Plum- A. artificial
- B. natural
- C. phylogenetic Answer Key
- D. numerical
Explanation: Classification given by Bentham and Hooker is Natural System. Monocots were placed after dicots; closely related families were seperated;…
Correct answer: natural- A. Bulbils
- B. Runners
- C. Rhizome
- D. Offsets
Explanation: The rhizome is a thickened, underground, dorsoventral stem that grows horizontally at a particular depth within the soil.
Correct answer: Rhizome- A. Bee
- B. Wind
- C. Bat
- D. Water
Explanation: A single ovule in the ovary and flowers packed into inflorescence are characteristics of wind-pollinated flowers.Pollen are light weight…
Correct answer: Wind- A. Water
- B. Insects or wind
- C. Birds
- D. Bats
Explanation: In aquatic plants with emergent flowers e.g., water lily and water hyacinth, pollination takes place by wind or insects.Emergent plants…
Correct answer: Insects or wind- A. Megasporangium
- B. Megasporophyll
- C. Megaspore mother cell
- D. Megaspore
Explanation: The ovule of an angiosperm is equivalent to a megasporangium which consists of 2 synergids, 1 egg, 3 antipodal cells, and a secondary…
Correct answer: Megasporangium- A. Algae
- B. Fungi
- C. Angiosperms
- D. Gymnosperms
Explanation: Double fertilization is the characteristic feature of angiosperms. Here, two male gametes are released in the embryo sac or female…
Correct answer: Angiosperms- A. Aleurone cell
- B. Synergids
- C. Generative cell
- D. Nucellar embryo
Explanation: The filiform apparatus is a mass of finger-like projections of the wall into the cytoplasm.
Correct answer: Synergids- A. Involve meiosis
- B. Occur in ovule
- C. Occur in anther
- D. Form gametes without further divisions
Explanation: In angiosperms, microsporogenesis i.e., formation of microspores (or pollen grains) occurs by the meiotic divisions of diploid microspore…
Correct answer: Involve meiosis- A. Innermost layers of the seed coat
- B. Degenerated nucellus
- C. Immature embryo
- D. Free nuclear endosperm
Explanation: Coconut has multicellular endosperm (called coconut meal) in the outer part and free nuclear as well as vacuolate endosperm (called…
Correct answer: Free nuclear endosperm- A. The flowers pollinated by flies and bats secrete foul odor to attract them
- B. Honey is made by bees by digesting pollen collected from flowers
- C. Pollen grains are not rich in nutrients
- D. Pollen grains of some plants cause severe allergies and bronchial afflictions in some people
Explanation: A. Flowers pollinated by insects are large, colorful, and secrete fruity odor.B.
Correct answer: Pollen grains of some plants cause severe allergies and bronchial afflictions in some people- A. Dry stigma
- B. Wet stigma
- C. Hollow style
- D. Solid style
Explanation: Style is traversed by the pollen tube to reach the ovule.It is of two types hollow and solid.
Correct answer: Solid style- A. Multicarpellary syncarpous gynoecium
- B. Multicarpellary apocarpous gynoecium
- C. Complete inflorescence
- D. Multicarpellary superior ovary
Explanation: An aggregate fruit or etaerio is a group of simple fruitlets that develop from free ovaries (apocarpus condition) of a single flower…
Correct answer: Multicarpellary apocarpous gynoecium- A. In-vitro fertilization
- B. Breeding programs
- C. Supplementing food
- D. Ex-situ conservation
Explanation: Pollen grains are believed to be rich in nutrients (protein 7-26 % carbohydrates 24-48%, fats 0.9-14.5%).
Correct answer: Supplementing food- A. Recognize the suitable pollen at the stigma
- B. Stimulate division of generative cell
- C. Produce nectar
- D. Guide the entry of the pollen tube
Explanation: In the ovule, the pollen tube is attracted by secretions of synergids. Usually, the pollen tube enters the embryo sac by passing into one…
Correct answer: Guide the entry of the pollen tube- A. Being a diploid tissue
- B. Its formation by fusion of secondary nucleus with several sperms
- C. Being a haploid tissue
- D. Having no reserve food
Explanation: Both perisperm and endosperm are nutritive layers. Perisperm is the residual persistent nucellus of seed prior to fertilization while…
Correct answer: Being a diploid tissue- A. Endosperm
- B. Cotyledons
- C. Hypocotyl
- D. Perisperm
Explanation: In some seeds, the endosperm persists in the seed as food storage tissue.Such seeds are called endospermic or albuminous, e.g.,castor…
Correct answer: Endosperm- A. Vallisneria
- B. Mulberry
- C. Cucumber
- D. Maize
Explanation: In Vallisneria, water pollination occurs while mulberry and maize undergo wind pollination. In cucumber, animal pollination is observed.
Correct answer: Cucumber