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
Artocarpus integra is the scientific name of ___________.
1.Guava
2.Pineapple
3.Silver Oak
4. Jack fruit
Biological control is to check growth of
1.plants
2.animals
3.weeds
4.one pest by another
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
Deep fried foods are carcinogenic because they are rich in
1.Nicotine
2.Hydrocarbons
3.Fats
4.All of the above
Every ecosystem must have
1.Autotrophs
2.Heterotrophs
3.Both A & B
4.photosynthesizers
Goosebumps are caused by contractions of the
1.Muscles
2.Nerves
3.Bones
4. All of the above
In a nucleosome, the DNA is wrapped around
1. histone octamer
2.helix
3.double helix
4. None of the above
In ovaries, the final products of meiosis are
1.haploid gametes
2.diploid gametes
3. Both A & B
4.None of the above
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
In which of the following, the cellular power plants - Mitochondria are absent?
1.Bacteria
2.Red Algae
3.Brown Algae
4. Green Algae
In which Organelle does Cellular Respiration Occur?
1.Chloroplast
2.ATP and NADPH
3.Mitochondria
Limbs of frog, lizard, bird and human are example of ______ organs.
1.Homogenous
2.Heterogeneous
3.Analogous
4.Homologous
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
Movement of cell against concentration gradient is called
1. active transport
2.diffusion
3.osmosis
4.passive transport
Oxygen in our blood is transported by a protein named
1.keratin
2.myoglobi
3.collagen
4.haemoglobin
Plants grow in size because of
1.addition of cells
2.increase in size of cells
3.enlargement of cells
4.elongation of cells
Plants grow in size because of
1. addition of cells
2.increase in size of cells
3.enlargement of cells
4. elongation of cells
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
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
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.
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
Spongy, porous bone tissue is also called
1.Compact bone
2.Bone fissure
3. Yellow bone marrow
4.Cancellous bone
The first formed primary xylem elements are called ___________.
1.Metaxylem
2.Protoxylem
3.Xylem fibres
4. Xylem parenchyma
The functional unit of the nervous system is the
1.Nephrons
2.Axons
3.Neurons
4. All of the above
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
The limbic system structure that regulates hunger is called the
1.Hypothalamus
2.Cerebellum
3.Pituitary gland
4.vacuole
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
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
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.
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
What base is found in RNA but not in DNA?
1.Uracil
2.Cytosine
3.Adenine
4.Guanine
What carries Blood back to the Heart?
1.Veins
2.Arteries
3.Both A & B
4.None
What do genes code for?
1.Ptoteins
2.DNA
3.RNA
4.None
What does the central nervous system consists of?
1.Brain
2.Spinal cord
3.Nerves
4.All the above
What process accounts for species diversity?
1.Predation
2.Mitosis
3.Symbiosis
4.Meiosis
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
Where does protein synthesis take place in a cell?
1.Ribosomes
2.Mitochondria
3.Cytoplasm
4.Nucleus
Which best describes somatic mutations?
1.transmitted to progeny
2.not transmitted to progeny
3.Can't be identified
4. None of the above
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
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
Which of the following is not a hormone found in animals?
1.Insulin
2.Auxins
3.Thyroxin
4.Adrenaline
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
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
Which of these phosphorylates ADP to make ATP?
1.E
2.B
3.C
4.A
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
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.
Which parts of the heart receive blood from the lungs?
1.Right ventricle
2.Left Atrium
3.Left Ventricle
4.Right Atrium
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
Which virus is not associated with cancer?
1. Epstein-Barr virus
2.Papillomavirus
3.Retrovirus
4.Hepatitis virus