National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 8

Post Your Answer

Subject :NSO    Class : Class 10

In a Drosophila, black eye colour is dominant over brown eye and allele for normal wings is dominant over allele of vestigial wing. Hybrid obtained in F1 generation have black eye colour with normal wing. By selfing of F1 hybrid, total 560 offspring were obtained in F2 having four different genotypes. How many flies with black eyes and vestigial wings; and brown eyes with normal wings would be obtained? What would be their possible genotypes?


A105--- 210--- BBWw--- bbWw
B 105--- 105--- Bbww--- bbWw
C 315--- 35--- BbWw--- Bbww
D 100--- 150--- bbww--- BBww


Pls provide an explanation

Post Your Answer

Subject :NSO    Class : Class 6

A few mixtures are listed in the box.
(i) Salt solution (ii) Oil and water (iii) Alcohol and water (iv) Soda water (v) Iron and sand (vi) Flour and husk (vii) Milk
Now, read the given passage and fill in the blanks by selecting an appropriate option. Mixtures (p) are homogeneous in nature while mixtures (q) are heterogeneous in nature. Mixture(s) (r) is/are separated into its/their components by centrifugation where (s) component collects towards the centre. Mixture (t) is separated into its components by distillation where the component having (u) boiling point gets collected in the receiver flask first.

P Q R S T U
A i, ii, vi iii, iv, v, vii ii, v Heavier iii Higher
B ii, iv, vi i, iii, v, vii ii, iv Lighter vii Lower
C i, iii, iv ii, v, vi, vii vii Lighter iii Lower
D i, iii, vi ii, iv, v, vii iv, vii Heavier i Higher


Post Your Answer

Subject :NSO    Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
C

Ans 2:

Class : Class 3
C

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
the correct option is 'C' BECAUSE SUGAR IS A SOLID SO WHEN THE LIQUID IS HEATED IT EVAPORATES LEAVING THE SUGAR BEHIND

Ans 2:

Class : Class 6
Option C

Post Your Answer

Subject :NSO    Class : Class 6

Ans 1:

Class : Class 7

Ans 2:

Class : Class 6
C is the answer, as in each of these processes, the heat is absorbed.

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
i think correct answer is C

Post Your Answer

Subject :NSO    Class : Class 3

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
C as the scale is 1:0.05

Post Your Answer