1. Cobalt is a component of which of the following Vitamins?
[A] Vitamin A
[B] Vitamin D
[C] Vitamin E
[D] Vitamin B12
Show Answer
Correct Answer: D [Vitamin B12]
Notes:
Cobalt is a component of Vitamin B12. Vitamin B12 is also known as also known as cobalamin, is an important water-soluble vitamin which is used in the production of red blood cells and DNA.
2. Non-vascular embryophytes are __:
[A] Pteridophytes
[B] Algae
[C] Bryophytes
[D] Gymnosperms
Show Answer
Correct Answer: C [Bryophytes]
Notes:
Bryophytes are an informal group consisting of three divisions of non-vascular land plants: the liverworts, hornworts and mosses. They play a vital role in regulating ecosystems because they provide an important buffer system for other plants.
3. Which among the following is the correct meaning of Phyllotaxy?
[A] Classification of plants as per the leaves structure
[B] The manner of arrangement of leaves in stem or branch
[C] The manner the leaves fall from the branches
[D] The anatomy of leaves in angiosperms
Show Answer
Correct Answer: B [The manner of arrangement of leaves in stem or branch]
Notes:
Phyllotaxy means the manner of arrangement of leaves in stem or branch. It is the arrangement of leaves on a plant stem. Phyllotactic spirals usually form a distinctive class of patterns in nature.
4. From the point of view of evolution of living organisms, which of the following set of animals is a correct sequence of evolution?
[A] Whale, Kangaroo, Echidna
[B] Echidna, Whale, Kangaroo
[C] Kangaroo, Whale, Echidna
[D] Echidna, Kangaroo, Whale
Show Answer
Correct Answer: D [ Echidna, Kangaroo, Whale]
Notes:
The correct sequence of the evolution would be Monotremes, Marsupials and Eutheria. Since, Whale is in subclass Eutheria, it is the latest in the evolution. So the correct sequence is Echidena (Monotreme), Kangaroo (Marsupials) & Whale (Eutheria).Echidna are the only surviving members of the Monotremata order and are the only living mammals that lay eggs.
5. Which of the following is present in prokaryotic as well as eukaryotic cells?
[A] Mitochondria
[B] Golgi Bodies
[C] Lysosomes
[D] Ribosomes
Show Answer
Correct Answer: D [ Ribosomes]
Notes:
Mitochondria, Chloroplasts, Golgi Bodies, Lysosomes, Endoplasmic reticulum and Peroxisomes are absent in prokaryotic cells. Ribosomes are smaller in prokaryotic cells and larger in eukaryotic cells.
6. Which movements of “Touch me not plant” lead to closing of its leaves when touched?
[A] Nyctinastic movements
[B] Seismonastic movements
[C] Chemonastric movements
[D] Photonastic movements
Show Answer
Correct Answer: B [Seismonastic movements]
Notes:
Seismonastic Movement is caused by the mechanical stimuli like shock, touch, fast moving wind, etc. Mimosa pudica is a perennial herb which is also known as the touch me not plant or the sensitive plant, is well-known for closing its leaves (or folding its leaves inwards) when touched.
7. Root hair in plants are produced from which of the following?
[A] cortex
[B] pericycle
[C] epidermis
[D] endodermis
Show Answer
Correct Answer: C [epidermis]
Notes:
Cells of the epidermis produce root hairs near the root apex. These cells are generally thin-walled, in contrast to the cells of the cortex, lying below the surface, which ultimately may become very thick-walled. The root hairs have fundamental importance in absorption of water and nutrients.
8. Which of the following is a fibrous protein?
[A] Enzymes
[B] Keratin
[C] Haemoglobin
[D] Albumin
Show Answer
Correct Answer: B [Keratin]
Notes:
Keratin is a group of fibrous proteins occurring in hair, feathers, hooves, and horns. Keratins have coiled polypeptide chains that combine to form supercoils of several polypeptides linked by disulphide bonds between adjacent cysteine amino acids.
9. Which of the following at the opposite of micropylar end represents the basal part of the ovule?
[A] Hilum
[B] Nucellus
[C] Chalaza
[D] Funicle
Show Answer
Correct Answer: C [Chalaza]
Notes:
The chalaza is a structure inside bird and reptile eggs and plant ovules. It attaches or suspends the yolk or nucellus within the larger structure. It represents the basal part of the ovule.
10. What is the role of Pneumatophores?
[A] Protect plant from animals
[B] Supports plant in standing upright
[C] Get oxygen for respiration
[D] Helps plant for pollination
Show Answer
Correct Answer: C [Get oxygen for respiration]
Notes:
Pneumatophores are specialized root structures that grow out from the water surface and facilitate the aeration necessary for root respiration in hydrophytic trees such as many mangrove species.
