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Write true
or false. If false change the statement so that it is true.

(a) Actin
is present in thin filament

(b) H-zone
of striated muscle fibre represents both thick and thin filaments.

(c) Human
skeleton has 206 bones.

(d) There
are 11 pairs of ribs in man.

(e) Sternum is present on the ventral
side of the body.

x is

Select the appropriate words to fill in the blanks.

What are the two main organ systems of a plant?

Arrange the following steps of a plant breeding programme in the correct order.



I. Selection and testing of superior recombinants

II. Collection of variability

III. Cross hybridisation between the selected parents

IV. Evaluation and selection of parents

V. Testing, release and commercialisation of new cultivars

Which stage of cell division is responsible for genetic variations and evolution of species?

Food in the buccal cavity and stomach are called as____ ___and _________ respectively.

The lateral meristem in plant is reponsible for

Light and dry pollen is a characteristic feature of flowers pollinated by ____.

Read the following statements.

(i) In haplo-diploid sex-determination system, the males do not have father and thus cannot have sons, but have a grandfather and can have grandsons

(ii) In honey bee, workers are developed by the unfertilized egg by means of parthenogenesis

(iii) In human skin colour, the effect of each allele is additive

(iv) In XO type of sex-determination, male have half number of chromosome than the female.

Select the incorrect statement.

Differentiate
between (a) a psychologist and a psychiatrist (b) a counsellor and a
clinical psychologist.

_______________ make up more than one half the volume of neural tissue in our body.

One molecule of an enzyme is able to catalyse conversion of two molecules of substrate into products in 5 minutes. Ten molecules of enzyme and 25 molecules of substrate are mixed in a test tube. At the end of 10 minutes the test tube will have ___.

Suggest the aspects of reproductive health which need to be given special attention in the present scenario.

Statement: Grass eating animals have a four chambers in their stomach.

Reason: They developed this to digest fats.

Which of the following options is correct?

Statements:

Some flies are ants.

All insects are ants.

Conclusions:

I. All flies are ants.

II. Some ants are insects.

Choose the correct set of base pairings in DNA and RNA.

"First meiotic division is the reduction division". What does the word 'reduction' refer to in this statement?

The delay of flowering will result due to combine deficiency of

Henry’s law constant for carbon dioxide in water is 1.67 × 108 Pa at 298K. Calculate the quantity
of carbon dioxide in 500ml of soda water when packed under a pressure of 2.5atm of CO2 at 298K

Arrange the given steps in correct sequence and select the correct answer.



Strategic steps for inbreeding are:

I. Identify superior male and superior female of the same breed.

II. These are then mated.

III. Evaluate the progeny obtained from the mating to identify superior males and females.

IV. In cattle, superior female is the cow or buffalo that produce more milk per lactation and superior male is the bull that gives rise to superior progenies.

V. Superior progenies obtained are further mated.

The kind of climax community in an area depends mostly on the area’s

Difference between gynandromorphs and gynander

The first emerged nonvascular, amphibious autotrophs which prefer non-polluted habitats are grouped in the division -

Question 4

What is genetic manipulation? How is it useful in agricultural practices?

What is host cell