Biology:2016:CBSE:[All India]:Set-I

A Male honeybee develops from an unfertilised egg by the process of parthenocarpy, while a female honey bee develops from the fertilised egg. Therefore, male honey bee has 16 chromosomes, while a female honey bee has 32 chromosomes (16+16).

In MOET, the genetic mother is administered with FSH (Follicle stimulating hormone) to stimulate the production of many eggs for super ovulation. This results in the production of 6-8 eggs per cycle instead of one.

Biopiracy refers to the exploitation of plant and animal species by monopolisation, without any compensation to the indigenous countries, from where these resources have been obtained. It can also be defined as the use of bio-resources by companies and organisation without proper authorisation and permission for the same.

Following are two advantages of preferring CNG over diesel as an automobile fuel:

• Unlike diesel, CNG burns most efficiently and very little of it is left in the automobiles.
• CNG is cheaper than diesel.

Evidence shows that Homo habilis essentially ate fruit and did not eat meat while Homo erectus probably ate meat.

Pea plant is monoecious whereas papaya plant is dioecious. Being monoecious, a single pea plant produces both male and female gametophyte and thus can produce pods with viable seeds through geitonogamy. Papaya plants on the other hand, are either male or female because of which geitonogamy is prevented. Hence, papaya plant cannot produce viable seeds.

Stop codon indicates no code for any amino acid.

Unambiguous codon indicates one codon codes for only one amino acid.

Degenerate codon indicates one codon codes for more than one amino acid.

Universal codon indicates that codon is nearly same for all either human or bacteria.

Four important steps to produce a disease resistant plant through conventional plant breeding technology are given below:

Step 1: Collection of germplasm

Step 2: Evaluation and selection of parent pplants

Step 3: Cross hybridisation of selected plants

Step 4: Selection and testing of superior recombinant

Nucleopolyhedrovirus is a genus of baculovirus. Baculovirus attack insects and other arthropods. They are considered good biological agents because of the following properties:

• Species specific
• No negative impact on non-target organisms
• Narrow spectrum insecticidal application

The ultra violet rays emitted from the sun, strike CFC molecules present in the environment. As a result, CFC molecules are broken down and chlorine atoms are released. A free chlorine atom binds to ozone molecule and releases single oxygen atom. It leads to the depletion of ozone layer in the stratosphere.