“Explore the cell cycle, its stages, and the crucial processes of cell growth, division, and replication that drive organism development.”
Biology Class 12 Chapter 7 Notes
The Syndrome which is an example of trisomy of the sex chromosome is: Klinefelter’s syndrome
In incubating eggs artificially the incubators are usually regulated at temperature between: 36 – 38oC
For maximum growth the optimum temperature is 25 – 30oC and it least at: 5 – 10oC
From Hensen’s node,dorsal mesoderm is formed and is organized into: Somitcs
On the basis of structure and shape of the cap,two species of Acetabularia have been identified: A.crenulata & A.arabica
In addition to auxin which hormone also play important role in apical domince: Cytokinins
in plants regeneration is the basis of plant: Reptiles
Primary tissue is added by the: Apical meristem
Which one of the following condition is resulted from excess GH in adults: Acromegaly
If lobster loses its pincer claw a new claw: Regenerates
Deficiency of vasopressin or ADH by the pituitary gland leads to a disorder in which the patients kidney have lessoned ability to absorb water is: Diabetes insipidus
An ordered sequence of irrversible steps with each step setting up the necessary conditions for the next step is: Development
Which of the following hormones is not released by the anterior pituitary: Melanocyte – releasing hormone
Which prosess is characterized by movement and rearrangement of cells in the embryo: Gastrulation
In the chick the mesodermal cells migrate and caudally from both sides and create a mid line thickening called: Primitive streak
Parathyroid hormone acts to ensure that: Calcium levels in the blood never drop too low
In humans ,MSH(melanocyte-stimulating hormone): Regulates primary skin color
During elongation the cell volume increase up to 150 fold due to uptake of: Water
A plant has a growth pattern called: Open growth
The negative physiological changes in our body are said to be: Agning
Clear cytoplasm produces: Larval epidermis
In chordates the healing of fracture and repair of a skin wound are some other examples of: Regeneration
_______ regulates the kidney’s retention of water: Vasopressin (ADN)
Oxytocin is secreted by the endocrine gland named: Pituitary gland
The addrenaline cortex produces: Aldosterone
The actual reduction division is: Meiosis -I
Programmed and organized death of cell is known as: Apoptosis
Monqolism is the other name of: Turner’s syndrome
The condensation of chromosomes reaches to its maximum during: Leptotene
The chances of teenage mother having down’s syndrome child is: One in many thousand
Nerve cells and eye lens cells remain in stage for life time: G0
Which tumor is delocalized or has branches other than site of orgin: Malignant
Crossing over and random assortment of chromosomes are two significant happenings of: Meiosis
Phragmoplast is formed by vesicles originated from: Golgi complex
The series of changes which involve period of growths replication of DNA followed ny cell division may be named as: Cell cycle
Important : Review all previous years’ 12 class past papers for comprehensive practice and better exam preparation.