Biology (Theory) Paper 1 2013-2014 ISC (Commerce) Class 12 Question Paper Solution

Mention one significant difference between Parenchyma and Sclerenchyma.

Mention one significant difference between Epistasis and dominance

Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase

Mention one significant difference between Symplastic movement and apoplastic movement

Mention one significant difference between Phenotype and Genotype

Give reasons for the following:

Testes descend into the scrotum before birth.

Give reasons for the following:

Secondary growth does not occur in monocot stems.

Give reasons for the following:

Nitrogenous fertilizers are not applied in fields where leguminous crops grow.

Give reasons for the following:

The genetic code is 'universal'

Give reasons for the following:

At higher temperatures, green plants start evolving CO₂ instead of O₂.

In the following questions/statements has four suggested answers. Rewrite the correct answer

Typhoid is classified as a:

(A) Viral disease

(B) Genetic disorder

(C) Bacterial disease

(D) Protozoan disease

In the following questions/statements has four suggested answers. Rewrite the correct answer

Bt cotton is resistant to:

(A) Insects

(B) Herbicides

(C) Salt

(D) Drought

In the following questions/statements has four suggested answers. Rewrite the correct answer

Roots and shoots lengthen through the activity of:

(A) Apical meristem

(B) Vascular Cambium

(C) Lateral meristem

(D) Cork Cambium

In the following questions/statements has four suggested answers. Rewrite the correct answer

An antiviral protein released from infected and dying cells is:

(A) Antigen

(B) Antibody

(C) Antiserum

(D) Interferon

In the following questions/statements has four suggested answers. Rewrite the correct answer

Opening and closing of stomata is due to:

(A) Ca²⁺

(B) Na⁺

(C) K⁺

(D) Cl–

State the best-known contribution of Alec Jeffery

State the best-known contribution of P.K. Sethi

State the best-known contribution of Hugo de Vries

Expand the following: SCID

Expand the following: 

ZIFT

Describe the Miller and Urey experiment on the origin of life

Define Frameshift mutations

Define Genetic drift.

Name and define the three types of natural selection.

State Hardy Weinberg's principle.

State the following:

Theory of recapitulation

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

What are homologous organs?

How do homologous organs help in providing evidence for organic evolution?

Describe the different types of vascular bundles.

Give three anatomical differences between a monocot root and a dicot root

Explain the effect of light and temperature on photosynthesis.

Explain the transpiration pull theory for an ascent of sap

Briefly describe the process of spermatogenesis.

Define Placentation

Define Parthenocarpy

Define Diffusion

Why are xylem and phloem classified as complex tissues?

Describe the structure of phloem.

Describe the ultra-structure of a chloroplast.

State three functions of the placenta

Describe the experiment performed by Griffith. What conclusions did he infer from his observations?

What is artificial insemination? Mention two ways in which it is useful in the breeding of dairy animals

What is single cell protein? Give its source and significance

How did Hershey and Chase prove that DNA is the genetic material?

Give one main application of MRI

Give one main application of Ultrasound

Give one main application of ECG

Explain the role of stem cells in medical treatment.

Write short notes on Multiple Alleles

Write short notes on Artificial measures to control population

What complications will arise if the blood of an Rh-positive person is transfused to an Rh-negative person and vice versa?

State any three goals of the human genome project.

State any three goals of the human genome project.