Tag: biology

Questions Related to biology

Water is an end product in which of the following process?

biology food components and nutrition water as nutrient basics of water pollution sources of water

  1. Glycogenolysis

  2. Hydrostatic skeleton

  3. Respiration

  4. Carbon assimilation

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Correct Option: C

Living cell contains $60 - 75$% water. Water present in human body is

biology food components and nutrition water as nutrient basics of water pollution sources of water

  1. $60 - 65$%

  2. $50 - 55$%

  3. $75 - 80$%

  4. $65 - 70$%

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Correct Option: D
Explanation:
Our cells are made of 60-75% water, hence most of the enzymes and protein molecules, our genetic material, all are water soluble and are evolved in a way to co-exist in water surrounding environment. Thus our proteins are folded in a way where the hydrophobic amino acid residues are folded inside the protein and hydrophilic residues face the hydrated outer environment. Similarly our DNA, RNA are all water soluble. Since the structural and functional unit of our body, consists of 60-75% of water hence, the entire human body is expected to have similar water content.
So, the correct answer is '65−70%'.

When a litre of water is introduced in human blood, 

biology food components and nutrition water as nutrient basics of water pollution sources of water

  1. BMR decreases

  2. RBCs collapse and urine production increases

  3. BMR increases

  4. RBCs collapse and urine production decreases

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Correct Option: B

Which of the below statements is/are not correct regarding chlorophyll a molecule?

(i) Molecule formula of chl a is $C _{55}H _{72}O _5N _4Mg$
(ii) It is the primary photosynthetic pigment.
(iii) In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength. 
(iv)It is a soluble in water as well as petroleum ether.

biology photosynthesis in higher plants types of chlorophyll pigments photosynthetic pigments

  1. (i) and (iii)

  2. (iii) and (iv)

  3. (ii) only

  4. (iv) only

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Correct Option: B
Explanation:

Chlorophyll a is the primary photosynthetic pigment, which is bluish green in the pure state. It has an empirical formula $C _{55}H _{72}O _5N _4Mg$and molecular weight of $893$. It absorbs more red wavelength of light than violet blue . It is soluble in a number of organic solvents such as petroleum ether. 

So, the correct answer is ' In the pure state, it is red in colour and thus it absorbs more blue wavelength of light than the red wavelength and It is a soluble in water as well as petroleum ether'.

Generally, decline in hearing power begins after the age of 

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. 50 years

  2. 30 years

  3. 40 years

  4. 10 years

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Correct Option: C
Explanation:

Ageing is the process where there is a continuous decline in the metabolism of the body. The hearing power also declines after the age of 40 years. Presbycusis is the term which is generally used for hearing impairment due to old age. It is mainly caused due to degeneration of the cochlea or associated structures of the inner ear or auditory nerves.

So, the correct answer is option C.

Cell which keeps changing it's shape is called

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Spirilla

  2. Pleomorphic

  3. Symbiont

  4. Gram negative

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Correct Option: A

Power is regeneration is poor in.

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Brain cell

  2. Bone cell

  3. Chondroblasts

  4. Striated muscles

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Correct Option: A

Storage sprouting of potato can be prevented by 

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. IAA

  2. Maleic hydrazide

  3. Cytokinins

  4. Gibberellins

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Correct Option: B
Explanation:

Maleic hydrazide : It is a growth retardant which checks cell division. So during seed storage this is applied for checking sprouting of potato tubers so that the importance of potato may not be lowered down.

The process of cell death involving DNA cleavage in cells is known as

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Necrosis

  2. Apoptosis

  3. Cytokinesis

  4. Endocytosis

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Correct Option: B
Explanation:
Apoptosis is the process in living cells which results in the death of cells that are damaged, attacked by pathogens, cancerous cell, abnormal cell, etc. Such cells are identified by the cells of the immune system followed by the production of proteins that kills the cell by DNA cleavage. It is also called programmed cell death. Thus the correct answer is option A. 

Glucose and amino acids are absorbed through the following part of villus.

mitosis structure of chromosome, cell cycle and cell division cell division biology cell division in embryo development division for growth and reproduction

  1. Epithelial cells

  2. Blood capillary

  3. Lymphatic vessel

  4. All

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Correct Option: A