Biology (Theory) Set 1 2016-2017 ISC (Commerce) Class 12 Question Paper Solution

Answer the following question:

Why do Green plants start evolving CO₂ instead of O₂, at high temperatures?

Define Apomixis.

Answer the following question: 

What is a Recon?

Why are the spores of Bacillus thuringiensis used as bioinsecticide?

Initiation codon of protein synthesis in Eukaryotes is ______.

GUA

GGA

CCA

AUG

Type of Interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.

Altruism

Scavenging

Protocooperation

Commensalism

Choose the correct option of the following question:

Wings of Insect and Birds are examples of :

Analogous

Homologous

Vestigial

Atavism

Choose the correct option of the following question:

The pressure of the cell contents on the cell wall is known as:

Wall pressure

Osmotic pressure

Turgor pressure

Diffusion pressure

Give a scientific term for the following:

An act of expelling the full-term foetus from mother’s uterus at the end of gestation.

Give a scientific term for the following:

Entry of a pollen tube into an ovule through integuments.

Give a scientific term for the following: 

An alternative form of the single gene which influences the same character and produces different expressions in different individuals a species.

Give a scientific term for the study of human population covering all aspects and parameters.

Expand the following abbreviation MTP.

Expand the following abbreviation IW.

Expand the following abbreviation:

HIV

Expand the following abbreviation DPD.

Name the scientists who have contributed to the following: 

Discovered the fossil of Cro-Magnon man.

Name the scientists who have contributed to the following:

Classified active and passive absorption of water by roots.

Name the scientists who have contributed to the following:

Reported Haemophilia.

Name the scientists who have contributed to the following:

Discovered double fertilization.

Differentiate between Apes and Man with respect to the following characteristic: Posture.

Differentiate between Apes and Man with respect to the following characteristic: Brow ridges.

Differentiate between Apes and Man with respect to the following characteristic: Cranial capacity.

Define the protobionts.

What is cognogeny?

Explain any three molecular (genetic) evidences in favour of organic evolution.

Define biogenesis.

Define fossil.

List any three drawbacks of Darwinism.

State Hardy-Weinberg’s principle.

Differentiate between Directional natural selection and Disruptive natural selection. 

Give four anatomical differences between a dicot leaf and monocot leaf.

Briefly describe the secretory phase of the menstrual cycle.

Define: Menarche

Define actinomorphic symmetry.

Give a graphic representation of the Hatch Slack or C4 cycle.

Give two significant difference between:

Transpiration and Guttation

Give two significant differences between:

Chlorophyll ‘a’ and Chlorophyll b ‘

Define amniocentesis.

Define the Polyembryony.

Describe K⁺ transport stomatal mechanism.

Draw a neat labelled diagram of L.S. of anatropous ovule.

Differentiate between the following:

Spermatogenesis and oogenesis

Differentiate between the following :

Apocarpous ovary and syncarpous ovary

Explain pleiotropy with reference to phenylketonuria.

Explain the mechanism of transcription in a prokaryotic cell.

Explain Rh factor incompatibility during pregnancy.

Discuss the various In-situ and Ex-situ strategies for conservation of biodiversity. 

List any four applications of tissue culture.

Mention the causative agent and the preventive measures for the following: Gonorrhoea

Mention the causative agent and the preventive measures for the following: Pneumonia.

Name the components of lac operon and discuss their role.

Give the importance/significance of transgenic animals.

Give one significant difference between:

Electroporation and Gene Gun.

Give one significant difference between :

ECG and EEG