HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions for Biology

What happened when heat-killed S-cells along with living R-cells were injected into mice?

If a DNA has 20 Adenine and 30 cytosine bases. What will be the total number of purine bases in the given sample?

Compare and Contrast the insitu and exsitu conservation.

Log S =log C = Z log A is the equation that depicts relation between______.

Write the name of Gaseous growth hormone known to you.

Write the name of Standard bioassay method for auxins.

Explain how species diversity can harm ecosystem.

Write the functions of DNA.

Write a short note on ‘Mutational breeding’.

Name the high-yielding semi-dwarf varieties of wheat selected and introduced in India in 1963.

Give reason :
Emasculation is done in a flower which is selected as female parent.

What is ‘biofortification’?

Which steps would you follow to develop a new variety of crop plant by selective breeding?

What is plant breeding?

In Brassica (rapeseed, mustard)........................ varietys is resistant to Aphids.

(a) Pusa A-4
(b) Pusa Gaurav
(c) Pusa Sawni
(d) . Pusa Shubra

Vijaya, Padma, Kanti and Jayanti are high-yielding varieties of ______.

Give the names of ‘two’ insect-resistant crop varieties.

What is emasculation?

What are transgenic plants? Explain with any two examples

With the help of suitable diagram define 'bagging' and 'tagging' of  flower.