R4RIN – MCQs, Mock Tests | Biology Biology MCQS section -3

Visceral fat is stored chiefly ____

1. within subcutaneous adipocytes
2. around the thighs and neck
3. around the abdominal organs
4. within the liver and spleen

✅ Correct Answer: 3

Select the correct statement about photosynthesis by primary producers.

1. Photosynthetic protists and prokaryotes Carry out the majority of the photosynthesis in aquatic communities.
2. Land plants carry out over 80% of the world's photosynthesis.
3. Cyanobacteria carry out more of the world's photosynthesis than protist do.
4. All of the above

✅ Correct Answer: 1

Every ecosystem must have

1. Autotrophs
2. Heterotrophs
3. Both A & B
4. photosynthesizers

✅ Correct Answer: 1

Which parts of the heart receive blood from the lungs?

1. Right ventricle
2. Left Atrium
3. Left Ventricle
4. Right Atrium

✅ Correct Answer: 2

Plants grow in size because of

1. addition of cells
2. increase in size of cells
3. enlargement of cells
4. elongation of cells

✅ Correct Answer: 1

Which of the following is true of enzymes?

1. Enzymes lowers the activation energy for the chemical reaction
2. Enzymes speed up the rate of a chemical reaction
3. Both A & B
4. Neither A nor B

✅ Correct Answer: 3

Oxygen in our blood is transported by a protein named

1. keratin
2. myoglobi
3. collagen
4. haemoglobin

✅ Correct Answer: 4

Where does protein synthesis take place in a cell?

1. Ribosomes
2. Mitochondria
3. Cytoplasm
4. Nucleus

✅ Correct Answer: 1

Which statement describes decomposers?

1. Decomposers are insignificant organisms in the ecosystem and can be absent in some ecosystems
2. Decomposers can produce their own source of energy and can sometimes act as primary producers.
3. Decomposers are those organisms that recycle matter in the ecosystem..
4. All the above

✅ Correct Answer: 3

Limbs of frog, lizard, bird and human are example of ______ organs.

1. Homogenous
2. Heterogeneous
3. Analogous
4. Homologous

✅ Correct Answer: 4

The functional unit of the nervous system is the

1. Nephrons
2. Axons
3. Neurons
4. All of the above

✅ Correct Answer: 3

Biological control is to check growth of

1. plants
2. animals
3. weeds
4. one pest by another

✅ Correct Answer: 4

An irregular mode of reproduction resulting in the development of an embryo without fertilization is called 1.Parthenogenesis 2.Apogamy 3.Sporophytic budding Select the correct answer using the code given below.

1. 1 only
2. 2 only
3. 2 and 3 only
4. 1, 2 and 3

✅ Correct Answer: 4

Bone strength in later life depends on

1. the formation of dense bones during youth
2. the increased calcium absorption in the elderly
3. the increased production of estrogen after menopause
4. reducing physical activity to protect bones

✅ Correct Answer: 1

Select the correct statement about lymphocytes.

1. Lymph transport is faster than that occurring in veins
2. Lymph transport depends on the movement of adjacent tissues, such as skeletal muscles
3. Lymph transport is only necessary when illness causes tissue swelling
4. Under normal conditions, lymph vessels are very high-pressure conduits

✅ Correct Answer: 2

Spongy, porous bone tissue is also called

1. Compact bone
2. Bone fissure
3. Yellow bone marrow
4. Cancellous bone

✅ Correct Answer: 4

In Paramecium, the food is moved to a specific spot by the movement of ______ which cover the entire surface of the cell.

1. cilia
2. villi
3. pseudopodia
4. vacuole

✅ Correct Answer: 1

What does the central nervous system consists of?

1. Brain
2. Spinal cord
3. Nerves
4. All the above

✅ Correct Answer: 4

What three statements make up the cell theory?

1. All living things are made up of cells.
2. New cells come frome exisiting cells.
3. Cells are the basic unit of structure/function in living things.
4. All of the above

✅ Correct Answer: 4

The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages. The first stage is the ___________ stage.

1. Agar
2. Leafy
3. Chlorella
4. protonema

✅ Correct Answer: 4

Artocarpus integra is the scientific name of ___________.

1. Guava
2. Pineapple
3. Silver Oak
4. Jack fruit

✅ Correct Answer: 4

Metastasis is the process by which _________

1. Cell divide rapidly under the influence of drugs
2. Cancer cell spread through the blood or lymphatic system to other site or organs
3. The Chromosome in cell nuclei are attached to the soindle before moving to the anaphase poles
4. Cancer cells are successfully inhibited to divide any further

✅ Correct Answer: 2

The term aerotolerant anaerobe refers to an organism that

1. uses oxygen or grows without oxygen.
2. requires more oxygen than is present in air.
3. does not use oxygen but tolerates it.
4. requires less oxygen than is present in air.

✅ Correct Answer: 3

Movement of cell against concentration gradient is called

1. active transport
2. diffusion
3. osmosis
4. passive transport

✅ Correct Answer: 1

What carries Blood back to the Heart?

1. Veins
2. Arteries
3. Both A & B
4. None

✅ Correct Answer: 1

In a nucleosome, the DNA is wrapped around

1. histone octamer
2. helix
3. double helix
4. None of the above

✅ Correct Answer: 1

Which virus is not associated with cancer?

1. Epstein-Barr virus
2. Papillomavirus
3. Retrovirus
4. Hepatitis virus

✅ Correct Answer: 3

Which of these phosphorylates ADP to make ATP?

1. E
2. B
3. C
4. A

✅ Correct Answer: 1

Which of these best describes genetic drift?

1. Random fluctuations in the gene frequencies within a population Eliminate
2. The combining of alleles to create more genetic variations within a population
3. The movement of alleles between population
4. A planned method to reduce the number of inferior genes in a population

✅ Correct Answer: 1

Which one of the following functions is not carried out by smooth endoplasmic reticulum?

1. Transport of materials
2. Synthesis of lipid
3. Synthesis of protein
4. Synthesis of steroid hormone

✅ Correct Answer: 3

In ovaries, the final products of meiosis are

1. haploid gametes
2. diploid gametes
3. Both A & B
4. None of the above

✅ Correct Answer: 1

Select the correct statement about the ureters.

1. The ureter is innervated by parasympathetic nerve endings only.
2. Ureters contain sphincters at the entrance to the bladder to prevent the backflow of urine.
3. The epithelium is stratified squamous like the skin, which allows a great deal of stretch.
4. The ureters are capable of peristalsis like that of the gastrointestinal tract.

✅ Correct Answer: 4

What process accounts for species diversity?

1. Predation
2. Mitosis
3. Symbiosis
4. Meiosis

✅ Correct Answer: 4

In which Organelle does Cellular Respiration Occur?

1. Chloroplast
2. ATP and NADPH
3. Mitochondria
4.

✅ Correct Answer: 4

Which of the following are involved directly in pulmonary circulation?

1. left ventricle, aorta, and inferior vena cava
2. right atrium, aorta, and left ventricle
3. superior vena cava, right atrium, and left ventricle
4. right ventricle, pulmonary artery, and left atrium

✅ Correct Answer: 4

Select the correct statement contrasting gametophytes and sporophytes.

1. Sporophytes are diploid, whereas gametophytes are haploid.
2. Sporophytes are vascular, whereas gametophytes are nonvascular.
3. Sporophytes are larger than gametophytes
4. All of the above

✅ Correct Answer: 1

What base is found in RNA but not in DNA?

1. Uracil
2. Cytosine
3. Adenine
4. Guanine

✅ Correct Answer: 1

Which best describes somatic mutations?

1. transmitted to progeny
2. not transmitted to progeny
3. Can't be identified
4. None of the above

✅ Correct Answer: 1

Deep fried foods are carcinogenic because they are rich in

1. Nicotine
2. Hydrocarbons
3. Fats
4. All of the above

✅ Correct Answer: 3

The sex of an offspring is determined by which of the following?

1. DNA of the female gamete
2. DNA of the male gamete
3. Neither the DNA of the male nor the female gamete
4. DNA of the male and the female gamete

✅ Correct Answer: 2

The first formed primary xylem elements are called ___________.

1. Metaxylem
2. Protoxylem
3. Xylem fibres
4. Xylem parenchyma

✅ Correct Answer: 2

The limbic system structure that regulates hunger is called the

1. Hypothalamus
2. Cerebellum
3. Pituitary gland
4. vacuole

✅ Correct Answer: 1

Which of the following is a feature of leptin?

1. It acts primarily on the brain
2. It is secreted by the brain and acts on fat cells
3. It is an enzyme
4. It is usually deficient in thin people

✅ Correct Answer: 2

Plants grow in size because of

1. addition of cells
2. increase in size of cells
3. enlargement of cells
4. elongation of cells

✅ Correct Answer: 1

Which of the following is not a hormone found in animals?

1. Insulin
2. Auxins
3. Thyroxin
4. Adrenaline

✅ Correct Answer: 2

The kidneys are stimulated to produce renin

1. when the pH of the urine decreases
2. when the specific gravity of urine rises above 1.10
3. when the peritubular capillaries are dilated
4. by a decrease in the blood pressure

✅ Correct Answer: 4

In which of the following, the cellular power plants - Mitochondria are absent?

1. Bacteria
2. Red Algae
3. Brown Algae
4. Green Algae

✅ Correct Answer: 1

What do genes code for?

1. Ptoteins
2. DNA
3. RNA
4. None

✅ Correct Answer: 1

Goosebumps are caused by contractions of the

1. Muscles
2. Nerves
3. Bones
4. All of the above

✅ Correct Answer: 1

Which one of the following statements about lymph is correct?

1. Lymph is formed due to leakage of blood through capillaries.
2. Lymph contains blood cells such as RBC.
3. Lymph is also circulated by the blood circulating heart.
4. Lymph only transports hormones.

✅ Correct Answer: 3