Explanation: ‘Genera Plantarum’ is a collection of a brief description of the 935 plant genera, this book was written by Swedish Naturalist Carl Linnaeus (1707-1778).
Q2. The branch of biology dealing with the study of cells is known as–
(a) Cytology
(b) Histology
(c) Psychology
(d) Physiology
Answer: (a) Cytology
Explanation: Cell is the fundamental unit of life. The branch of biology which deals with the study of cells is called Cytology. Robert Hook is known as the father of Cytology.
Q3. The xylem in plants are responsible for:
(a) Transport of water
(b) Transport of food
(c) Transport of amino acids
(d) Transport of oxygen
Answer: (a) Transport of water
Explanation: Xylem is a transport tissue that transport water to different part of the plant. It is present in vascular plants.
Q4. What is the plant cell wall mainly composed of?
(a) Lipids
(b) Vitamin
(c) Cellulose
(d) Protein
Answer: (c) Cellulose
Explanation: Plant cell wall is composed of cellulose It is a tough organic polysaccharide compound. Cellulose cell wall helps to provide structural and mechanical support.
Q5. AIDS virus destroys
(a) Lymphocytes
(b) Monocytes
(c) Neutrophils
(d) Basophils
Answer: (a) Lymphocytes
Explanation: AIDS virus destroys the T. Lymphocytes belong to a group of white blood cells known as Lymphocytes that play a central role in cell-mediated immunity.
Q6. Yeast is a .
(a) Bacteria
(b) Fungi
(c) Algae
(d) Bryophyte
Answer: (b) Fungi
Explanation: Yeasts are eukaryotic, single-cell micro-organisms classified as members of the fungus kingdom. Yeast such as Candida, lbicans are pathogens and can cause infection in humans.
Q7. The tallest and thickest type of grass is–
(a) Alfalfa
(b) Fodder
(c) Bamboo
(d) Lichens
Answer:(c) Bamboo
Explanation: Grass has belonged to the Graminae family same as Bamboo is also from the Graminae family, it is a perennial plant of the grass family with a height of up to 100 feet. Bamboo is the fastest growing plant in the world.
Q8. The only snake that builds a nest is:
(a) Chain viper
(b) King Cobra
(c) Krait
(d) Saw-scaled viper
Answer: (b) King Cobra
Explanation: King Cobra is the only snake that not only lives in holes but also builds a nest.
Q9. Match List-I (Physiological processes) with List-II (Cell organelles) and select the correct answer by using the codes given below:
List- I
List-II
A. Photosynthesis
1. Plasma membrane
B. Mineral uptake
2. Chloroplast
C. Respiration
3. Mitochondria
D. Protein synthesis
4. Ribosomes
(a) A – 1; B – 2; C – 3; D – 4
(b) A – 1; B – 2; C – 4; D – 3
(c) A – 2; B – 1; C – 3; D – 4
(d) A – 2; B – 1; C – 4; D – 2
Answer: (c) A – 2; B – 1; C – 3; D – 4
Explanation: Photosynthesis occurs in green plants with the help of chloroplast. The plasma membrane is a membrane of transport minerals. Cellular respiration is related to mitochondria, by which energy releases. The ribosome is helped in protein synthesis.
Q10. The gas released during photosynthesis :
(a) Carbon dioxide
(b) Oxygen
(c) Carbon monoxide
(d) Sulfur dioxide
Answer: (b) Oxygen
Explanation: Oxygen gas is released during photosynthesis which generates after the photosynthesis of water.
Q11.What is the name of the hormone produced by the thymus gland?
(a) Thyroxine
(b) Auxins
(c) Cytokinins
(d) Thymosin
Answer: (d) Thymosin
Explanation: The thymus is an endocrine gland that releases the hormone thymosin. The thymus gland helps to generate immunity by maturing the T-lymphocyte cells.
Q12. DNA differs from RNA in having a nitrogenous base–
(a) Adenine
(b) Guanine
(c) Cytosine
(d) Thymine
Answer:(d) Thymine
Explanation: DNA (Deoxyribose Nucleic Acid) have four nitrogenous bases Adenine, Thymine. Cytosine, Guanine and same as RNA (Ribose Nucleic Acid) have four bases as Uracil, Cytosine, Guanine and Adenine. In RNA Uracil replace the Thymine.
Q13. HYV refers to–
(a) Hybrid Yielding Variety
(b) Human Yellow Virus
(c) High Yielding Variety
(d) Human Yellow Vaccine
Answer: (c) High Yielding Variety
Explanation: HYV refers to ‘high yielding variety. High yielding varieties are crops with better traits, high productivity per area and less use of chemical fertilizers and pesticides.
Q14. Which one of the following is a modified stem?
(a) Carrot
(b) Sweet potato
(c) Coconut
(d) Potato
Answer: (d) Potato
Explanation: Potato tuber bears buds in small pits known as eyes. Buds develop to branches. Some of the branches become green, erect and leafy stems that grow horizontally underground.
Q15. A test-tube baby means–
(a) A baby grew in a test-tube
(b) Embryo fertilised in the uterus and developed in test-tube
(c) Embryo fertilised and developed in the uterus
(d) Fertilisation in vitro and then transplantation in the uterus
Answer: (d) Fertilisation in vitro and then transplantation in the uterus
Explanation: Test tube baby is in-vitro fertilisation of sperm and egg and the resultant zygote is then transplanted in the uterus. The zygote at the stage of 16-32 is called, or Blastocyst is transferred in the mother’s womb for further development. It is a method of Assistant reproductive technology (ART).
Q16. What is the chromosome number in a human ovum?
(a) 24
(b) 46
(c) 48
(d) None of these
Answer: (d) None of these
Explanation: There are a total of 46 chromosomes present in human cells. During the formation of gametes i.e., ovum in females and sperm in males, the chromosome number is reduced to half i.e. 23 by the meiosis cell division.
Q17. Which of the following is the Study of fossils?
(a) Ethology
(b) Etiology
(c) Anthropology
(d) Paleontology
Answer: (d) Paleontology
Explanation: Paleontology origin from the Greek word paleon mean old, ancient, logy study. Palaeontology is the study of fossils.
Q18. Which of the following are warm-blooded animals?
(a) Whales
(b) Whale sharks
(c) Alytes
(d) Draco
Answer: (a) Whales
Explanation: Warm-blooded animals are those organisms that have a constant body temperature without the influence of the external environment. Warm-blooded animals are also known as endothermic.
Q19. Mon 863 is a variety of maize. It was in the news for the following reason.
(a) It is a genetically modified dwarf variety that is resistant to drought
(b) It is a genetically modified variety that is pest resistant
(c) It is a genetically modified variety with ten times higher protein content than regular maize crop
(d) It is a genetically modified variety used exclusively for biofuel production
Answer: (b) It is a genetically modified variety which is pest resistant
Explanation: Mon 863 is genetically modified variety of maize, which is resistant of corn root worm.
Q20. Consider the following statements:
Biodiversity hotspots are located only in tropical regions.
India has four biodiversity hotspots i.e., Eastern Himalayas, Western Himalayas, Western Ghats and Andaman and the Nicobar Islands.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2
Answer: (d) Neither 1 nor 2
Explanation: Biodiversity hot spots are located in temperate regions and hotspots are present in the eastern Himalayas, Western Ghats and the Andaman Islands.
Q21. The double-helix model of Watson and Crick is known as
(a) C-DNA
(b) B-DNA
(c) Z-DNA
(d) D-DNA
Answer: (b) B-DNA
Explanation: One of the secondary structures exhibited by DNA is the famous Watson–Crick model. This model says that DNA exists as a double helix. The two strands of polynucleotides are anti-parallel i.e., run in the opposite direction.
Q22. The camel’s hump is composed of tissue. It is a type of
(a) skeletal tissue
(b) areolar tissue
(c) adipose tissue
(d) muscular tissue
Answer: (c) adipose tissue
Explanation: The camel’s hump is composed of adipose tissue
Q23. Which one of the following sets are correctly matched?
(1) Diphtheria, Pneumonia and Leprosy: Hereditary
(2) AIDS, Syphilis and Gonorrhoea: Bacterial
(3) Colour blindness, Haemophilia and Sickle cell anaemia: Sex-linked
(4) Polio, Japanese B encephalitis and Plague: Viral
(a) Only 2
(b) only 3
(c) 1 and 4
(d) None of these
Answer: (d) None of these
Explanation: Diphtheria, Leprosy, Plague are Bacterial diseases.
Colour blindness and Haemophilia – Sex-linked disease.
Sickle cell anaemia is a genetic disease in which RBC became sickle-shaped.
Q24. Uric acid is the chief nitrogenous waste of which of the following?
(a) Human
(b) Frogs
(c) Fishes
(d) Birds
Answer: (d) Birds
Explanation: Nitrogenous waste produced by organisms are categorized into three types uric acid, urea and ammonia. Uric acid is released from birds and reptiles. It reduces the loss of water from the body and organisms are known as ‘Uricotelic.’
Q25. An antigen is a substance which
(a) lowers body temperature
(b) destroys harmful bacteria
(c) triggers the immune system
(d) is used as an antidote to the poison
Answer: (c) triggers the immune system
Explanation: Foreign particles possessing the antigens can elicit an immune response in the body.
