NARAYANKAR NOTES

Q1. Choose correct option A. Which is not a property of living being?  a. Metabolism        b. Decay  c. Growth              d. Reproduction B. A particular plant is strictly seasonal plant.Which one of the following is best suited if it is to be studied in the laboratory?  a. Herbarium.           b. Museum  c. Botanical garden    d. Flower exhibition C. A group of students found two cockroaches in the classroom. They had a debate whether they are alive or dead. Which life property will help them to do so?  a. Metabolism        b. Growth   c. Irritability          d. Reproduction Q2. Distinguish between botanical gardens,zoological park and biodiversity park with reference to characteristics. Ans:- Sl. No. Botanical Gardens Zoological Parks Biodiversity Parks i. Plants of di...

  1. Choose correct option: A. Which of the following shows single stranded RNA and lacks protein coat? c).Viroid  a. Bacteriophage b. Plant virus c. Viroid d. Animal virus B. Causative agent of red tide is  a)dinoflagellate a. Dinoflagellate b. Euglenoid c. Chrysophyte d. Lichen C. Select odd one out for Heterotrophic bacteria.  c)Methanogens  a. Nitrogen fixing bacteria b. Lactobacilli c. Methanogens d. Cyanobacteria D. Paramoecium : Ciliated Protist Plasmodium :  d)Sporozoan   a. Amoeboid protozoan b. Ciliophora c. Flagellate protozoan d. Sporozoan 2. Answer the following: A. What are the salient features of monera? Ans) i)Size: The organisms included in this kingdom are microscopic, unicellular and prokaryotic (cells lack a well defined nucleus). ii. Occurrence: These are omnipresent, means, they are found in all types of environments, including those which are not generally inhabited by other living beings. iii.Nucleus: These organisms do not have...

Qno.1. Choose correct option A. Which is the dominance phase pteridophytes?  a.Capsule          b.Gametophyte        c.Sporophyte     d.Embryo B. The tallest living gymnosperm among the following is..............   a.Sequoia sempervirens  b.Taxodium mucronatum  c.Zamia pygmaea  d.Ginkgo biloba C. In bryophytes...............  a.Sporophyte and gametophyte generations are independent.   b.Sporophyte is partially dependent upon gametophyte.  c.Gametophyte is dependent upon sporophyte.  d.Inconspiuous gametophytes is present. D. A characteristic of angiosperm is.........  a.Collateral vascular bundles   b.Radial vascular bundles   c.Seed formation    d.Double fertilization  E. Angiosperms differ from gymnosperms in having ..............   a.Vessels in wood   b.Autotrophic mood off nutrition  c.Siphonogamy   d.Enclosed seed ...

Qno.1. Choose correct option  A. Which of the following belongs to a minor phylum.  a. Comb jelly.     b.Jelly fish  c. Herdmaria.     d.Salpa B. Select the animal having venous heart.  a. Crocodile            b.Salamander  c. Rohu.                   d.Toad C.  In Ascaris..................   a. Mesoglea is present.  b. Endoderm is discontinous layer.  c. Mesoderm is present in patches.  d. Body cavity is present. D. Which of the following is incorrect in case of birds.  a. Presence of teeth.  b. Presence of scales.  c. Nucleated RBCs.  d. Hollow bones. E. Chitinous exoskeleton is a characteristic of ................  a. Dentalium.        b. Antedon  c. Millepede.         d. Sea urchin Qno.2. Answer the following questions  A. Reptiles are known ...

✅✅✅ Very Very Important Questions (Highly conceptual and often asked in long answers or MCQs): 1.Fluid mosaic model proposed by Singer and Nicolson replaced Sandwich model proposed by Danielli and Davson? Why? Ans:- i. The Davson–Danielli model of the plasma membrane of a cell, was proposed in 1935 by Hugh Davson and James Danielli. ii. The model describes a phospholipid bilayer that lies between two layers of globular proteins. iii. This model was also known as a ‘lipo-protein sandwich’, as the lipid layer was sandwiched between two protein layers. iv. But through experimental studies, membrane proteins were discovered to be insoluble in water (representing hydrophobic surfaces) and varied in size. Such type of proteins would not be able to form an even and continuous layer around the outer surface of a cell membrane. v. In case of Fluid-mosaic model, the experimental evidence from research supports every major hypothesis proposed by Singer and Nicolson. This hypothesis stated that me...