NEET Botany MCQs

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:<br> <i>Assertion A:</i> The first stage of gametophyte in the life cycle of moss is protonema stage.<br> <i>Reason R:</i> Protonema develops directly from spores produced in capsule.<br> In the light of the above statements, choose the most appropriate answer from the options given below:

• A is not correct but R is correct.
• Both A and R are correct and R is the correct explanation of A.
• Both A and R are correct but R is NOT the correct explanation of A.
• A is correct but R is not correct.

Identify the pair of heterosporous pteridophytes among the following:

• Equisetum and Salvinia
• Lycopodium and Selaginella
• Selaginella and Salvinia
• Psilolum and Salvinia

Axile placentation is observed in

• China rose, Petunia and Lemon
• Mustard, Cucumber and Primorose
• China rose, Beans and Lupin
• Tomato, Dianthus and Pea

Statement I: Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.<br> Statement II: Exarch condition is the most common feature of the root system.<br> In the light of the above statements, choose the correct answer from the options given below:

• Statement I is incorrect but Statement II is true.
• Both Statement I and Statement II are true.
• Both Statement I and Statement II are false.
• Statement I is correct but Statement II is false.

Family Fabaceae differs from Solanaceae and Liliaceae. With respect to the stamens, pick out the characteristics specific to family Fabaceae but not found in Solanaceae or Liliaceae.

• Epiphyllous and Dithecous anthers
• Diadelphous and Dithecous anthers
• Polyadelphous and epipetalous stamens
• Monoadelphous and Monothecous anthers

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R:<br> Assertion A: Late wood has fewer xylary elements with narrow vessels.<br> Reason R: Cambium is less active in winters.<br> In the light of the above statements, choose the correct answer from the options given below:

• A is false but R is true.
• Both A and R are true and R is the correct explanation of A.
• Both A and R are true but R is NOT the correct explanation of A.
• A is true but R is false.

Cellulose does not form blue colour with lodine because

• It breakes down when iodine reacts with it.
• It is a disaccharide.
• It is a helical molecule.
• It does not contain complex helices and hence cannot hold iodine molecules.

Among eukaryotes, replication of DNA takes place in

• G₂ phase
• M phase
• S phase
• G₁ phase

Which of the following stages of meiosis involves division of centromere?

• Telophase
• Metaphase I
• Metaphase II
• Anaphase II

The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?

• Diakinesis
• Pachytene
• Zygotene
• Diplotenes