List of practice Questions

Assertion (A): Natural ecosystems perform fundamental life support services, without life would cease.
Reason (R): The dependence on the ecosystems is poorly understood and they can provide life enhancing services.

The correct sequence of essential elements K, Mg, Mo, P, C of the given list, which show following activities.
A) ATP synthesis
B) Component of enzymes
C) Enzyme activation
D) Turgidity maintenance

Choose the correct statements among the following
A) Cellulose does not contain complex helices.
B) In DNA one full turn of helical will have 3.6\AA\ rise for each base pair.
C) Aibrin is a toxin secondary metabolite.
D) By grinding tissues in perchloric acid, acid soluble fraction can be obtained.

Choose the correct statements among the following
I. Epidermal cells have more cytoplasm and small vacuole.
II. Outer walls of guard cells are thick and inner walls are thin.
III. Presence of phloem on either side of xylem is seen in bicollateral vascular bundles.
IV. Trichomes of shoot system are multicellular.

Choose the correct statements among the following
I) Many desert plants show CAM photosynthesis.
II) Rotation of planet on its axis causes seasonal changes.
III) Ecology is concerned with the changes in the environmental conditions.
IV) Mechanical tissues are well developed in submerged water plants.

Choose the correct statements among the following
I. Exine exhibits an array of patterns and designs.
II. Tapetum layers of microsporangium will be useful for the dehiscence.
III. The intine wall of pollengrains is made up cellulose and pectin.
IV. By wall formation, 8 celled embryo sac is developed.

Choose the correct statements among the following
I. The longest cells are nerve cells.
II. Smaller DNA in the bacteria called genetic material.
III. Bacterial flagellum has filament, hook and basal body.
IV. In Bacteria, flagella are used to attach to the rock.

Choose the correct statements among the following
A) Proteins synthesised by ribosomes are modified in the cisternae and are released from trans face.
B) Primary wall is the first formed layer of cell.
C) In potato aleuroplasts store carbohydrates.
D) In the presence of magnesium ions two subunits of ribosomes are associated with each other.

Choose the correct statements among the following
I) Pasteur given the name virus.
II) Lichen are good pollution indicators.
III) Three Domain groups were originated from progenote.
IV) Chrysophytes belongs to Monera.

Choose the correct statements among the following
I. Diplo haplontic life cycle can be seen in Bryophyte.
II. In Volvox, meiosis in zygote results in haploid spore.
III. Cycas has siphonogamous oogamy.
IV. Mycorrhizal association can be seen in Cycas roots.

Assertion (A): In Nepenthes, the upper petiole is modified as tendril and lower petiole as phyllode and middle lamina as pitcher.
Reason (R): This is to trap insects for their nitrogen requirement.
Identify the correct option from the following

Assertion (A): External fertilization occurs in Angiosperms.
Reason (R): In internal fertilization organisms, egg is formed inside female body.
Identify the correct option from the following

Identify the universal rules of nomenclature among the following
A) Biological names are in Latin and written in italics.
B) The first word to start with small letter for genus.
C) The specific epithet to start with small letter.
D) Each organism name will have two components.

What are X and Z in the following reaction sequence? (X forms sodium alkynide) \[ X (C_4H_6) \xrightarrow{{partial reduction}} Y \xrightarrow{H_2O/H^+} Z ({major product}) \]

What is Z in the given reaction sequence? \[ {(1) } B_2H_6 \longrightarrow X \xrightarrow{PCC} Y \xrightarrow{NH_2OH} Z \] \[ {(2) } H_2O, H_2O_2, OH^- \]