Given below are two statements: Statement I: Decomposition is a process in which the detritus is degraded into simpler substances by microbes. Statement II: Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements, choose the correct answer from the options given below:
Match the plant with the kind of life cycle it exhibits:
List-I
List-II
(A)Spirogyra
(I)Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte
(B)Fern
(II)Dominant haploid free-living gametophyte
(C)Funaria
(III)Dominant diploid sporophyte alternating with reduced
gametophyte called prothallus
(D)Cycas
(IV)Dominant haploid leafy gametophyte alternating with
partially dependent multicellular sporophyte
Choose the correct answer from the options given below:
Explanation:
Correct match: A-II, B-III, C-IV, D-I (Option 2). Spirogyra shows a haplontic life cycle with a dominant haploid, free‑living gametophyte (A → II). Ferns have a dominant diploid sporophyte and a small, independent gametophyte called prothallus (B → III). Funaria (moss) has a dominant haploid gametophyte with a dependent, parasitic-looking diploid sporophyte, i.e., sporophyte partially dependent on the gametophyte (C → IV). Cycas, a gymnosperm, has a dominant diploid sporophyte with a highly reduced, dependent gametophyte (D → I).
🧠 Did You Know?
In NCERT, the life cycles are described with emphasis on dominance of the sporophyte in pteridophytes, gymnosperms, and angiosperms, and dominance of the gametophyte in bryophytes and many algae.
💡 NCERT Memory Line:
Algae and bryophytes: gametophyte-dominant; pteridophytes to angiosperms: sporophyte-dominant with often reduced gametophyte.
Read the following statements on lipids and find out correct set of statements:
A. Lecithin found in the plasma membrane is a glycolipid
B. Saturated fatty acids possess one or more c = c bonds
C. Gingely oil has lower melting point, hence remains as oil in winter
D. Lipids are generally insoluble in water but soluble in some organic solvents
E. When fatty acid is esterified with glycerol, monoglycerides are formed
Choose the correct answer from the option given below:
While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (–) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one specifies and (–) for another specifies involved in the interaction?
