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Find the statement that is NOT correct with regard to the structure of monocot stem.
In a monocot stem the hypodermis is sclerenchymatous (not parenchymatous); the other statements are correct.
The correct sequence of events in the life cycle of bryophytes is: A. Fusion of antherozoid with egg. B. Attachment of gametophyte to substratum. C. Reduction division to produce haploid spores. D. Formation of sporophyte. E. Release of antherozoids into water. Choose the correct answer:
Gametophyte attaches (B) → antherozoids released into water (E) → fertilisation (A) → sporophyte forms (D) → meiosis gives haploid spores (C). Sequence B, E, A, D, C.
Match List I with List II:
List I — A. Chlorophyll a, B. Chlorophyll b, C. Xanthophylls, D. Carotenoids
List II — I. Yellow-green, II. Yellow, III. Blue-green, IV. Yellow to Yellow-orange
Choose the option with all correct matches:
Chlorophyll a → blue-green (III); Chlorophyll b → yellow-green (I); Xanthophylls → yellow (II); Carotenoids → yellow to yellow-orange (IV).
In the seeds of cereals, the outer covering of endosperm separates the embryo by a protein-rich layer called:
In cereal grains the outermost protein-rich layer of the endosperm that separates it from the embryo is the aleurone layer.
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): A typical unfertilised, angiosperm embryo sac at maturity is 8 nucleate and 7-celled.
Reason (R): The egg apparatus has 2 polar nuclei.
Choose the correct answer:
The mature embryo sac is indeed 8-nucleate and 7-celled (A true). The egg apparatus consists of one egg and two synergids; the two polar nuclei lie in the central cell, not the egg apparatus, so R is false.
Which of the following are the post-transcriptional events in a eukaryotic cell? A. Transport of pre-mRNA to cytoplasm prior to splicing. B. Removal of introns and joining of exons. C. Addition of methyl group at 5' end of hnRNA. D. Addition of adenine residues at 3' end of hnRNA. E. Base pairing of two complementary RNAs. Choose the correct answer:
Post-transcriptional processing of hnRNA = splicing (B), 5′ capping (C) and 3′ poly-A tailing (D). pre-mRNA is processed before, not after, leaving the nucleus (A wrong); E is unrelated.
What is the pattern of inheritance for polygenic trait?
Polygenic (quantitative) traits are controlled by many genes with additive effects and show a continuous, non-Mendelian inheritance pattern.
Each of the following characteristics represent a Kingdom proposed by Whittaker. Arrange the following in increasing order of complexity of body organization. A. Multicellular heterotrophs with cell wall made of chitin. B. Heterotrophs with tissue/organ/organ system level of body organization. C. Prokaryotes with cell wall made of polysaccharides and amino acids. D. Eukaryotic autotrophs with tissue/organ level of body organization. E. Eukaryotes with cellular body organization. Choose the correct answer:
Monera (C, prokaryote) → Protista (E, unicellular eukaryote) → Fungi (A) → Plantae (D) → Animalia (B). Increasing order: C, E, A, D, B.
Who is known as the father of Ecology in India?
Ramdeo Misra is regarded as the "father of Ecology in India".
Match List I with List II:
List-I — A. Alfred Hershey and Martha Chase, B. Euchromatin, C. Frederick Griffith, D. Heterochromatin
List-II — I. Streptococcus pneumoniae, II. Densely packed and dark-stained, III. Loosely packed and light-stained, IV. DNA as genetic material confirmation
Choose the correct answer:
Hershey & Chase → confirmed DNA as genetic material (IV); Euchromatin → loosely packed, light-stained (III); Griffith → Streptococcus pneumoniae transformation (I); Heterochromatin → densely packed, dark-stained (II).
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