Show with the help of a cross, how colour blindness is inherited.
P - Normal male × Normal Female (but carrier)
Son-1 Normal - 1 Colour blind,
∴ 1 : 1, So 50% : 50%
Question ID: 465
Uploaded on: October 7, 2024
Write the name of reactants used and one origin compound formed in the experiment of Miller and Urey in connection with the chemical origin of life
Ammonia, Hydrogen and Methane were used in the experiment on the biochemical origin of life by Miller and Urey.
Question ID: 466
Uploaded on: October 7, 2024
Write four important features modified in the evolution of the horse.
The four important features modified in the evolution of the horse:
Question ID: 467
Uploaded on: October 7, 2024
How Sundari plant excretes the excess salt in its body?
Sundari plants excrete excess salt through specialized glands called salt glands. These glands are located on the underside of the leaves. The salt glands transport salt from the leaves to the stems, where it is excreted through pores. This process is known as transpiration-driven salt efflux.
Question ID: 468
Uploaded on: October 7, 2024
Write the names of two microorganisms participating in the process of biological nitrogen fixation.
Two microorganisms that participate in the process of biological nitrogen fixation:
Question ID: 469
Uploaded on: October 7, 2024
Mention two damages as a result of acid rain.
The two damages as a result of acid rain:
Question ID: 470
Uploaded on: October 7, 2024
Give four examples of damages to biodiversity as a result of global warming.
Four examples of damage to biodiversity as a result of global warming:
Question ID: 471
Uploaded on: October 7, 2024
Write the major topics regarding biodiversity documented in the People’s Biodiversity Register (PBR).
The major topics regarding biodiversity documented in the People’s Biodiversity Register (PBR) include:
Question ID: 472
Uploaded on: October 7, 2024
Draw a neat diagram of the vertical section of the eyeball of the human eye and label the following parts:
The vertical section of the eyeball:
Question ID: 473
Uploaded on: October 7, 2024
Draw a neat diagram of the metaphase of mitosis of a plant cell or an animal cell division and label the following parts:
Metaphase of mitosis of an animal cell
Question ID: 474
Uploaded on: October 7, 2024
Explain the interrelationship among chromosomes and genes and distinguish between euchromatin and heterochromatin on the following two aspects. (a) Coiling (b) Activity
Chromosomes and genes
Chromosomes are structures that contain genetic material. They are made up of DNA, which is tightly wrapped around proteins called histones. Genes are segments of DNA that code for specific proteins.
Euchromatin and heterochromatin
Euchromatin and heterochromatin are two types of chromatin, which is the material that makes up chromosomes. Euchromatin is less condensed than heterochromatin, and it is associated with active gene expression. Heterochromatin is more condensed than euchromatin, and it is associated with inactive gene expression.
Coiling
Euchromatin is more loosely coiled than heterochromatin. This makes it easier for transcription factors to access the DNA in euchromatin, and it allows for more active gene expression. Heterochromatin is more tightly coiled, which makes it more difficult for transcription factors to access the DNA. This leads to less active gene expression in heterochromatin.
Activity
Euchromatin is more active than heterochromatin. This is because euchromatin is more accessible to transcription factors, which are proteins that bind to DNA and regulate gene expression. Heterochromatin is less accessible to transcription factors, which is why it is less active.
Question ID: 475
Uploaded on: October 7, 2024
How micropropagation is done states that happens in the following three phases of sexual reproduction of flowering plants:-
Micropropagation is a technique for rapidly producing large numbers of plants from a single plant. It involves taking small pieces of plant tissue, such as leaves, stems, or roots, and growing them in a sterile environment on a nutrient-rich medium. The cells in the tissue culture multiply and differentiate into new plants.
The three phases of sexual reproduction in flowering plants are:
Question ID: 476
Uploaded on: October 7, 2024