11. Which one of the following types of micro-organisms is most widely used in industries?
[A] Bacteria
[B] Bacteria and fungi
[C] Bacteria and algae
[D] Bacteria, micro-algae and fungi
Show Answer
Correct Answer: D [Bacteria, micro-algae and fungi]
Notes:
Bacteria, micro-algae and fungi are most widely used in industries
12. Which organelle in the cell, other than nucleus, contains DNA?
[A] Centriole
[B] Golgi apparatus
[C] Lysosome
[D] Mitochondrion
Show Answer
Correct Answer: D [Mitochondrion]
Notes:
Mitochondrion is the organelle in the cell, other than nucleus that contains DNA. Mitochondria are the working organelles that keep the cell full of energy. Mitochondria are small organelles floating free throughout the cell. Some cells have several thousand mitochondria while others have none. Muscle cells need a lot of energy so they have loads of mitochondria.
13. Which one of the following is monogamous?
[A] Wolf
[B] Walrus
[C] Seal
[D] Deer
Show Answer
Correct Answer: A [Wolf]
Notes:
Wolf alpha pairs are usually monogamous with each other, but alpha males have been known to stray with other pack members, especially if they are closely related. Among red foxes, long considered extremely loyal, mate switching has also been shown.
14. In the branch of biology, what is the transmission of paternal traits to progeny called?
[A] Genetics
[B] Heredity
[C] Gerontology
[D] Genetic Engineering
Show Answer
Correct Answer: B [Heredity]
Notes:
The transmission of characteristics from parent to offspring is called heredity, and can be inferred from inherited characteristics.
15. Which of the following vitamins was discovered by Sir Edward Mellanby?
[A] Vitamin C
[B] Vitamin D
[C] Vitamin K
[D] Vitamin E
Show Answer
Correct Answer: B [Vitamin D]
Notes:
Vitamin D was discovered by Sir Edward Mellanby.
16. What is an enzyme?
[A] Acid
[B] Base
[C] Salt
[D] Catalyst
Show Answer
Correct Answer: D [Catalyst]
Notes:
Enzyme is a protein. It acts as a catalyst in living organisms, and controls the rate of chemical reactions inside the body.
17. Which type of cocci bacteria forms a cluster and irregular pattern?
[A] Staphylococci
[B] Diplococci
[C] Tetracocci
[D] Streptococci
Show Answer
Correct Answer: A [Staphylococci]
Notes:
Staphylococci are the correct answer here. They are known for forming grape-like clusters and irregular patterns. These are gram-positive cocci, or spherical bacteria, that belong to the family Micrococcaceae. Members of the Micrococcaceae family such as Staphylococcus, Micrococcus, and Kocuria, are ubiquitous in nature and are typically harmless, often residing on the skin and mucous membranes of humans and other mammals.
18. __ tissues synthesize natural cytokinins.
[A] Old
[B] Rapidly dividing
[C] Storage
[D] None of the above
Show Answer
Correct Answer: B [Rapidly dividing]
Notes:
Rapidly dividing tissues synthesize natural cytokinins. Cytokinins are produced in actively growing tissues such as embryos, developing fruits, and roots.
19. Which of the following is an example of a plant with a Fibrous Root System?
[A] Carrot
[B] Onion
[C] Oak Tree
[D] Turnip
Show Answer
Correct Answer: B [Onion]
Notes:
A fibrous root system is characteristic of grasses and other monocotyledons like onions. Unlike in the taproot system of dicotyledonous plants where one major root originates from the stem and smaller roots arise off of this taproot, in a fibrous root system many equally sized roots arise off of the stem. These types of roots cover a larger surface area and are therefore better at absorbing nutrients and water from the soil.
20. Which of the following are napiform roots?
[A] swollen in the middle and tapering towards both the ends
[B] broad at the base and conical at the apex
[C] no specific shape
[D] spherical at the base and taper towards the apex
Show Answer
Correct Answer: D [spherical at the base and taper towards the apex]
Notes:
Napiform roots are rounded at the base and taper towards the apex, an example of a turnip.
