Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
How many meiotic and mitotic divisions need to occur for the development of a mature female gametophyte from the megaspore mother cell in an angiosperm plant?
The megaspore mother cell undergoes 1 meiosis (→ 4 megaspores, one functional), then 3 free-nuclear mitotic divisions give the 8-nucleate embryo sac. So 1 meiosis + 3 mitosis.
Which of the following is an example of a zygomorphic flower?
Pea (Pisum) has a zygomorphic (bilaterally symmetrical) flower; Petunia, Datura and Chilli are actinomorphic.
Given below are two statements:
Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement II: Fig wasp and fig tree exhibit mutual relationship as fig wasp completes its life cycle in fig fruit and fig fruit gets pollinated by fig wasp.
In the light of the above statements, choose the most appropriate answer:
Both statements are correct: the fig encloses wasps, and the fig–fig wasp pair is a classic example of obligate mutualism (the wasp completes its life cycle in the fig and pollinates it).
What is the main function of the spindle fibers during mitosis?
Spindle fibres attach to centromeres and pull the sister chromatids (chromosomes) to opposite poles during mitosis.
Which one of the following is the characteristic feature of gymnosperms?
Gymnosperms ("naked seeds") bear ovules/seeds that are not enclosed within an ovary/fruit.
Match List I with List II:
List I — A. Pteridophyte, B. Bryophyte, C. Angiosperm, D. Gymnosperm
List II — I. Salvia, II. Ginkgo, III. Polytrichum, IV. Salvinia
Choose the option with all correct matches:
Pteridophyte → Salvinia (IV); Bryophyte → Polytrichum (III); Angiosperm → Salvia (I); Gymnosperm → Ginkgo (II).
Who proposed that the genetic code for amino acids should be made up of three nucleotides?
George Gamow proposed that a triplet (three-nucleotide) code is required to specify the 20 amino acids.
Match List I with List II:
List I — A. The Evil Quartet, B. Ex situ conservation, C. Lantana camara, D. Dodo
List II — I. Cryopreservation, II. Alien species invasion, III. Causes of biodiversity losses, IV. Extinction
Choose the option with all correct matches:
The Evil Quartet → causes of biodiversity losses (III); Ex situ conservation → cryopreservation (I); Lantana camara → alien species invasion (II); Dodo → extinction (IV).
In bryophytes, the gemmae help in which one of the following?
Gemmae are specialised asexual reproductive bodies (in gemma cups) by which bryophytes reproduce vegetatively.
Given below are two statements:
Statement I: In ecosystem, there is unidirectional flow of energy of sun from producers to consumers.
Statement II: Ecosystems are exempted from 2nd law of thermodynamics.
In the light of the above statements, choose the most appropriate answer:
Energy flow is unidirectional (I correct). Ecosystems obey the laws of thermodynamics, including the second law, so they are not exempted (II incorrect).
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