Biology Questions and Answers

Q: Surplus red blood cells, needed to meet an emergency, are MAINLY stored in which organ of the human body?

Surplus red cells are stored mainly in the spleen.It holds a reserve that contraction of its smooth muscle can release into the circulation during haemorrhage or strenuous exercise. The spleen also filters out worn-out red cells, which is why it is called the graveyard of erythrocytes.

Q: The plant dye Henna imparts orangered colour to skin and hairs due to its reaction with which of the following?

Henna colours skin and hair by reacting with protein and amino acids.Its dye, lawsone, binds to the keratin of skin and hair, which is why the colour is fast on those tissues but washes off anything else. The reaction is with the amino groups of the protein.

Q: Bronchitis is a disease of

Bronchitis is a disease of the respiratory tract - inflammation of the bronchi, the airways leading to the lungs.The lining swells and produces excess mucus, causing the persistent cough. Acute bronchitis usually follows a viral infection; the chronic form is caused chiefly by smoking.

Q: Plants that grow in saline water are called

Plants growing in saline water are halophytes, from the Greek halos, salt.Mangroves are the familiar example. They exclude salt at the root, excrete it through leaf glands, or shed it in old leaves, and many have stilt roots and breathing roots for the waterlogged mud.

Q: Embryo is found in-

The embryo is found in the seed.It is the young plant formed after fertilisation, consisting of the radicle, plumule and one or two cotyledons, packed with the stored food it will use until it can photosynthesise.

Q: Cancer cells are damaged by radiations while others are not because cancer cells are

Cancer cells are damaged by radiation because they are undergoing rapid division.DNA is most vulnerable while it is being replicated and the chromosomes separated, so dividing cells are far more radiosensitive than resting ones. It is also why radiotherapy affects hair follicles, bone marrow and gut lining - the body's other fast-dividing tissues.

Q: Which of the following is an Autoimmune disease?

Systemic lupus erythematosus is an autoimmune disease.The immune system makes antibodies against the body's own nuclear material, and the resulting inflammation affects skin, joints, kidneys, heart and brain. Anaphylaxis and farmer's lung are allergic rather than autoimmune.

Q: Blood is

Blood is slightly alkaline, at pH 7.35 to 7.45.It is held there by the bicarbonate buffer, by the lungs regulating carbon dioxide and by the kidneys excreting acid. Outside about 6.8 to 7.8 life cannot continue.

Q: Who is known as "Father of Medicine"-

Hippocrates is called the father of medicine.Working on Kos in the fifth century BC, he separated medicine from superstition, insisting that disease has natural causes. The Hippocratic Oath is named after him.

Q: Which feature do Prokaryotic and Eukaryotic cells share

Prokaryotic and eukaryotic cells both contain DNA.They also share ribosomes, a plasma membrane and cytoplasm. What the prokaryote lacks is a nuclear membrane and every membrane-bound organelle, so its DNA lies free in the cytoplasm as a single circular chromosome.

601.

Surplus red blood cells, needed to meet an emergency, are MAINLY stored in which organ of the human body?

A.pancreas
B.spleen
C.liver
D.kidneys

Answer: B

Surplus red cells are stored mainly in the spleen.

It holds a reserve that contraction of its smooth muscle can release into the circulation during haemorrhage or strenuous exercise. The spleen also filters out worn-out red cells, which is why it is called the graveyard of erythrocytes.

Discuss in Forum

602.

The plant dye Henna imparts orangered colour to skin and hairs due to its reaction with which of the following?

A.Protein and amino acid
B.Lipids
C.Carbohydrates
D.Nucleic acids

Answer: A

Henna colours skin and hair by reacting with protein and amino acids.

Its dye, lawsone, binds to the keratin of skin and hair, which is why the colour is fast on those tissues but washes off anything else. The reaction is with the amino groups of the protein.

Discuss in Forum

603.

Bronchitis is a disease of

A.Respiratory tract
B.Liver
C.Bladder
D.Blood

Answer: A

Bronchitis is a disease of the respiratory tract - inflammation of the bronchi, the airways leading to the lungs.

The lining swells and produces excess mucus, causing the persistent cough. Acute bronchitis usually follows a viral infection; the chronic form is caused chiefly by smoking.

Discuss in Forum

604.

Plants that grow in saline water are called

A.Halophytes
B.Hydrophytes
C.Mesophytes
D.Thallophytes

Answer: A

Plants growing in saline water are halophytes, from the Greek halos, salt.

Mangroves are the familiar example. They exclude salt at the root, excrete it through leaf glands, or shed it in old leaves, and many have stilt roots and breathing roots for the waterlogged mud.

Discuss in Forum

605.

Embryo is found in-

A.Flower
B.Leaves
C.Seeds
D.Buds

Answer: C

The embryo is found in the seed.

It is the young plant formed after fertilisation, consisting of the radicle, plumule and one or two cotyledons, packed with the stored food it will use until it can photosynthesise.

Discuss in Forum

606.

Cancer cells are damaged by radiations while others are not because cancer cells are

A.Starved
B.Different in nature
C.Undergoing rapid divisions
D.None of these

Answer: C

Cancer cells are damaged by radiation because they are undergoing rapid division.

DNA is most vulnerable while it is being replicated and the chromosomes separated, so dividing cells are far more radiosensitive than resting ones. It is also why radiotherapy affects hair follicles, bone marrow and gut lining - the body's other fast-dividing tissues.

Discuss in Forum

607.

Which of the following is an Autoimmune disease?

A.Systemic lupus erythematosus
B.Acute anaphylaxis
C.Farmer's lung
D.A heart attack

Answer: A

Systemic lupus erythematosus is an autoimmune disease.

The immune system makes antibodies against the body's own nuclear material, and the resulting inflammation affects skin, joints, kidneys, heart and brain. Anaphylaxis and farmer's lung are allergic rather than autoimmune.

Discuss in Forum

608.

Blood is

A.Alkaline
B.Neutral
C.Like a buffer
D.Acidic

Answer: A

Blood is slightly alkaline, at pH 7.35 to 7.45.

It is held there by the bicarbonate buffer, by the lungs regulating carbon dioxide and by the kidneys excreting acid. Outside about 6.8 to 7.8 life cannot continue.

Discuss in Forum

609.

Who is known as "Father of Medicine"-

A.Aristotle
B.Theophrastus
C.Hippocrates
D.Darwin

Answer: C

Hippocrates is called the father of medicine.

Working on Kos in the fifth century BC, he separated medicine from superstition, insisting that disease has natural causes. The Hippocratic Oath is named after him.

Discuss in Forum

610.

Which feature do Prokaryotic and Eukaryotic cells share

A.Nucleus
B.Dna
C.Nuclear membrane
D.Membrane bound organelles

Answer: B

Prokaryotic and eukaryotic cells both contain DNA.

They also share ribosomes, a plasma membrane and cytoplasm. What the prokaryote lacks is a nuclear membrane and every membrane-bound organelle, so its DNA lies free in the cytoplasm as a single circular chromosome.

Discuss in Forum

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