Biology

Which of the following describes the result of mitosis in unicellular organisms like Amoeba?

The phase of the cell cycle where the cell is metabolically active and growing, but not yet dividing, is:

A specific segment of DNA that provides instructions for a particular protein is a:

The process by which gametes (sperm and egg) are produced is called:

Which of the following describes a cell that contains only one set of chromosomes?

During mitosis, the spindle fibers are composed of which of the following proteins?

The sugar present in the DNA molecule is a five-carbon sugar called:

During the 'S' phase of the cell cycle, which of the following remains constant in a diploid cell?

The term 'Homologous chromosomes' refers to a pair of chromosomes that:

If a cell has a diploid number of $2n = 20$, how many 'Chromatids' will be present in the cell at the end of Anaphase I of meiosis?

What is a specific segment of DNA that provides instructions for a particular protein or trait called?

Who proposed the double-helix model of the DNA molecule?

Which of these pairs represents a homozygous recessive genotype?

A 'true-breeding' plant is one that:

Which of the following statements about sex-linked inheritance is true?

The total number of genes in a haploid set of chromosomes is known as the:

If a heterozygous man for a trait ($Aa$) marries a homozygous recessive woman ($aa$), what is the ratio of dominant to recessive phenotypes in their children?

In a human family, the father has blood group B and the mother has blood group A. They have already produced a biological child with blood group O. If they were to have another child, what is the probability that this child will be a male with either blood group A or blood group B?

If an organism has the genotype $Gg$ for a trait, what percentage of its gametes will carry the 'g' allele?

Which scientist(s) proposed the double-helical structure of DNA based on X-ray diffraction data?

The layer of cells that lies between the epidermis and the endodermis in a root is the:

Osmosis is a special type of:

Which part of the plant cell acts as a reservoir of cell sap?

The phenomenon of wilting of plants during a hot afternoon is due to:

The instrument used to measure root pressure in a laboratory setting is called a:

Which of the following remains unchanged during the process of plasmolysis?

The 'Turgor Pressure' of a cell is also known as:

During heavy rainfall, the water potential of the soil $(ψ_{soil})$ becomes almost zero. How does this affect the Diffusion Pressure Deficit ($DPD$) gradient between the soil and the root hairs?

Identify the type of movement where water moves through the cell walls and intercellular spaces without crossing any metabolic barriers.

The 'Tonoplast' is the membrane surrounding the vacuole. Its role in absorption is to:

Which of the following helps to prove that the lower surface of a dicot leaf loses more water?

Which of the following is true about the structure of stomata?

The rate of transpiration is highest during which part of the day, assuming sunny weather?

A higher concentration of Carbon dioxide ($CO_2$) in the atmosphere generally causes stomata to:

Which of the following is the most accurate description of the 'Adhesion' force in the ascent of sap?

If the rate of transpiration in a plant is very high, what is the most likely effect on the concentration of minerals in the leaves?

Which of the following correctly describes the effect of light on the rate of transpiration?

What happens to the 'Turgidity' of the subsidiary cells during stomatal opening according to the mechanical pressure model?

The 'Transpiration Pull' can pull water to heights of over 100 meters in giant Sequoias. What is the approximate 'tension' (negative pressure) required at the leaf end to achieve this?

How does an increase in the 'internal' $CO_{2}$ concentration within the substomatal cavity affect the stomata?

Which of the following is NOT a product of the light reaction?

During the light reaction, light energy is first used to:

The opening and closing of stomata is regulated by the change in the turgidity of:

A leaf was covered with a black paper strip and then exposed to sunlight. After testing for starch, the part under the strip remained brown. This proves:

The diagram below represents a vertical section of a leaf. What is the primary functional significance of the arrangement of cells in 'Layer X'?

Which of the following is the correct full form of NADP as used in photosynthesis?

In a leaf, the cells that contain the most chloroplasts are found in the:

In the following simplified reaction of the Calvin cycle, identify the molecule represented by 'Y'. $RuBP + CO_{2} \xrightarrow{Enzyme} Y \rightarrow Glucose$

Why is the lower surface of a dorsiventral leaf usually lighter in color and contains more stomata?

What happens to the $OH^{-}$ ions produced during the photolysis of water?

Which hormone is responsible for the elongation of internodes in dwarf plants?

The bending of a shoot towards light is termed as:

Identify the hormone that promotes the falling of mature leaves and fruits from the plant.

Which hormone can be used to increase the shelf life of cut flowers and leafy vegetables?

Any growth-related movement in plants where the direction of the movement is determined by the direction of the stimulus is called:

Which hormone's production is most associated with the aging of tissues and the ripening of fruits?

The response of plant roots to grow towards a source of moisture, even if it means growing against gravity, is called:

Which of the following is NOT a characteristic of plant hormones?

Hydrotropism, the growth of roots towards a water source, is powerful enough to override which other tropism?

Genetic dwarfism in plants can be completely reversed by the exogenous application of which phytohormone?

What is the term used for the decrease in the total number of Red Blood Cells in the body?

The blood vessel that carries oxygenated blood to the kidneys is the:

Which of the following is the main function of the Spleen?

The internal lining of the heart is known as the:

A person with Blood Group AB is considered a Universal Recipient because:

What is the primary significance of the hepatic portal system?

Which blood cell has a multi-lobed nucleus and performs phagocytosis?

A person having both Antigen A and Antigen B on their Red Blood Cells but no antibodies in their plasma belongs to blood group:

What happens during 'Ventricular Diastole'?

Which component of the blood is responsible for the transport of dissolved Carbon Dioxide in the form of Bicarbonate ions?

In which part of the kidney is the Malpighian capsule always located?

During selective reabsorption, useful substances are taken back into the blood from the tubule by:

Which of these is NOT an accessory excretory organ in humans?

The broad funnel-like space where the ureter enters the kidney is the:

A student notices that in cold weather, they need to urinate more frequently. This phenomenon is known as:

The flow of urine from the kidneys to the bladder through the ureters is aided by:

In which part of the nephron does the maximum amount of 'tubular secretion' of waste products like creatinine and certain drugs take place?

The chemical process of 'deamination' involves the removal of an amino group from an amino acid. In which organ does this process primarily take place to initiate nitrogenous waste production?

Albuminuria is a condition where albumin (a plasma protein) is found in the urine. This usually indicates damage to which part of the excretory system?

A sudden increase in systemic blood pressure would immediately lead to 'Pressure Diuresis'. This occurs primarily because:

The 'white matter' of the spinal cord is located:

In the human brain, which part is specifically responsible for relaying pain and pressure signals to the cerebrum?

The spinal cord passes through the holes in the vertebrae called the:

The part of the nervous system that controls all voluntary actions of the body is the:

In the flowchart of a simple reflex arc shown below, which letter represents the component that carries the motor impulse away from the spinal cord towards the effector?

Which part of the neuron receives incoming signals from other neurons or receptors?

Presbyopia is an eye defect usually occurring in older age because of:

What is the main function of the 'Neurilemma' in peripheral neurons?

In the brain, the 'Third Ventricle' is located within the:

If the Medulla Oblongata is damaged, which of the following vital functions would be most immediately threatened?

Which of these hormones is released from the posterior lobe of the pituitary gland?

A deficiency of Growth Hormone in childhood results in:

Which hormone stimulates the adrenal cortex to produce its hormones?

The endocrine part of the pancreas is composed of groups of cells called:

Which hormone prepares the body for action by redistributing blood from the digestive system to the skeletal muscles?

The specific site of action for Antidiuretic Hormone (ADH) within the kidney is the:

Which hormone is used medically as an anti-inflammatory and anti-allergic drug?

Which of the following correctly pairs the hormone with its metabolic role?

Hypersecretion of which hormone can lead to 'Gynaecomastia' (development of breast tissue) in human males?

Identify the incorrect statement regarding the hormone 'Calcitonin'.

The hormone that stimulates the production of milk in the mammary glands after childbirth is:

What is the result of the fusion of a male gamete and a female gamete?

Which of these is the primary sex organ in human females?

How many autosomes are present in a human gamete (sperm or egg)?

Which cells in the testes provide nourishment to the developing spermatozoa?

The 'after-birth' refers to the expulsion of which structure from the mother's body after the baby is born?

What is the primary role of the 'Follicle Stimulating Hormone' (FSH) in males?

What is the primary function of the 'Cremaster Muscle' in the male reproductive system?

Identify the STD caused by a spiral-shaped bacterium (Treponema pallidum) which progresses through primary, secondary, and tertiary stages.

Which of the following is a structural feature of the 'Blastocyst' that eventually gives rise to the embryo proper?

In a demographic sense, what does the 'Sex Ratio' refer to?

Which of the following is an example of an 'environmental resistance' factor?

The total number of children born per 1000 women in their lifetime is related to:

What is the effect of education on population growth?

Observe the population data for 'Region Z' in the diagram provided. Which of the following correctly identifies the 'Sex Ratio' and its interpretation for this region?

Approximately what percentage of the world's total population lives in India?

The ratio between the number of people and the land area they inhabit is called:

Which of the following contraceptive methods is considered $100\%$ reversible and provides long-term protection (3-5 years) through a sub-dermal implant?

What is the biological consequence of 'Inbreeding Depression' often seen in small, isolated populations?

The study of the relationship between human population dynamics and the environmental impact is often summarized by the $I = PAT$ equation. What does 'A' stand for in this context?

Which of these can be recycled multiple times?

Composting is a method to manage which type of waste?

The use of 'Unleaded Petrol' helps in reducing which pollutant?

Which of the following is a major source of marine pollution?

Study the process in the diagram below. What is the role of 'Charging Electrodes' in this device?

Which of the following is an effect of excessive noise pollution on human health?

Which of the following pollutants is a 'Secondary Pollutant' formed by the action of sunlight on Nitrogen oxides and hydrocarbons?

Why is the use of leaded petrol (containing Tetraethyl lead) banned in most countries?

What happens to the 'Carboxyhemoglobin' level in the blood of a chronic smoker?

Which of these is a 'Non-Point' source of water pollution?