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 Multiple Choice QuestionsMultiple Choice Questions

1.

Assertion : In bacteria, photosynthesis occurs by utilizing wavelengths longer than 700 nm.

Reason : Here the reaction centre is B-890.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


B.

If both the assertion and reason are true but reason is not the correct explanation of assertion.

In bacteria, the reaction centre is B-890 and photosynthesis occurs by utilizing wavelengths longer than 700 nm. The reductant is NADH + H+. In bacteria, the donor may be hydrogen sulphide etc, but not water.


2.

In prokaryotes, genetic recombination can occur during

  • transduction

  • transformation

  • conjugation

  • all of these


D.

all of these

In prokaryotes meiosis is absent due to absence of gamete formation.  But genetic recombination occurs through following process:

(i) Transduction

(ii) Transformation

(iii) Conjugation.


3.

Which form of reproduction is correctly matched?

  • Euglena transverse binary fission

  • Paramecium longitudinal binary fission

  • Amoeba multiple fission

  • Plasmodium binary fission


C.

Amoeba multiple fission

Reproduction is an essential feature of all living organisms. It is the process by which an individual multiplies in number by producing more individuals of its own type. 

Amoeba proteus does not reproduce sexually. The reproduction is essentially asexually and takes place by various methods such as binary fission, multiple fission and sporulation. Binary fission is the most common mode of reproduction. It results in the division of the parent Amoeba into two daughter amoebea. Amoeba reproduces by multiple fission during adverse environmental conditions.

Euglena  has longitudinal binary fission. Paramecium has transverse binary fission and Plasmodium  has multiple fission.


4.

In cloning of cattle a fertillized egg is taken out of the mother’s womb and

  • the egg is divided into 4 pairs of cells which are implanted into the womb of other cows

  • in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cow

  • in the eight cell stage the individual cells are separated under electrical field for further development in culture media

  • from this upto eight identical twins can be produced


B.

in the eight cell stage, cells are separated and cultured until small embryos are formed which are implanted into the womb of other cow

In cloning of cattle a fertilized egg divides in 2, then in 4 and then in 8. This embryo is carefully removed from the womb. The embryonic cells are then separated using enzyme. Each isolated cell is kept in a nutrient medium and later implanted in the womb of a different 'host mother' cow.

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5.

The most primitive cell like chemical aggregates capable of growth and division were

  • chemoautotrophs

  • eobionts

  • prokaryotes

  • microspheres


D.

microspheres

Microspheres are the most primitive cell like chemical aggregates. They resemble coccoid bacteria. These are molecular aggregates of proteinoids and capable of growth and division (binary fission or by budding).


6.

Assertion: Many plants are propagated vegetatively even though they bear seeds.

Reason: Potatoes multiply by tubers and apple by cutting.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion

The most common form of asexual reproduction in plants is called vegetative propagation. It is the formation of new plants from vegetative units (propagules) such as buds, tubers, rhizomes, roots, stem, leaf etc. Besides the natural methods of vegetative propagation, there are a number of techniques for artificial vegetative propagation of economically and aesthetically important plants. Potatoes are produced by tubers and not by seeds. Stem tubers are found in potato and artichoke. They have buds in the region of nodes or eyes for vegetative multiplication. Root cuttings are used in propagation of lemon, apple, orange, blackberry etc.


7.

How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

  • Three

  • Four

  • Nine

  • Two


D.

Two

The types of gametes produced by a plant depend upon the number of hetrozygous pair.
Number of types of gametes  = Zn
   n = number of heterozygous pair
                 21 = 2
The gametes are  - ABC and AbC.

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8.

Division in a bacterial cell is carried out through

  • multiple fission

  • binary fission

  • budding

  • plasmotomy


B.

binary fission

Division of bacterial cell is carried out by binary fission, in which, a single cell divides into two equal sized cells after developing a transverse cell wall.

Multiple fission is the division of the nucleus, simultaneously or successively into a number of daughter nuclei, followed by division of the cell body into an equal number of parts each containing a nucleus.

Budding is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site.

Plasmotomy is a type of asexual reproduction in which a multi- nucleate protozoan cell divides into two or more multi- nucleate daughter cells without the occurence of mitosis.


9.

In rabbit, head of epididymis present at the head of the testis is called

  • vas deferens

  • cauda epididymis

  • gubernaculum

  • caput epididymis


D.

caput epididymis

In rabbit head of epididymic present at the head of the testis is called caput epididymis.

Epididymis differentiated into smaller posterictir enlarged part is called caud epididymis.

Gubernaculum is fibro muscular mesodermal tissue which helps in positioning the testes within the scrotal sac.


10.

Noncleidoic eggs occur in

  • birds

  • fish

  • reptiles

  • platypus


A.

birds

Non Cleidoic egg - Egg membranes are soft in these eggs e.g. All viviparous animals and in oviparous animals which lays eggs in water.