231.Deficiency of which vitamin can cause night blindness?

1. B1
2. C
3. A
4. E

Option “3” is correct
Vitamin A is needed by the retina of the eye in the form of retinol, which combines with protein opsin to form rhodopsin, the light absorbing molecules necessary for both low light (scotopic vision) & colour vision.
232. Pedology is the science related to the study of:

1. Atmosphere
2. Soil
3. Pollutants
4. Seeds

Option “2” is correct
Pedology deals with the study of soil formation, soil morphology, and soil classification.
233. RBCs are formed in the ____________ in the adults.

1. Blue bone marrow
2. Red bone marrow
3. White bone marrow
4. Black bone marrow

Option “2” is correct
Red blood cell (RBC) production (erythropoiesis) takes place in the red bone marrow in adults.
234. The later (second) formed primary xylem elements are called _____________.

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

Option “2” is correct
The later formed primary xylem elements are called Metaxylem.
235. Which of the following does not hold true for Animal belonging to Phylum Chordate?

1. Notochord present
2. Pharynx perforated by gill slits.
3. Heart is dorsal (if present)
4. A post-anal part (tail) is present

Option “3” is correct
The Phylum Chordata is made up of the most evolved animals. The characteristics of chordates include bilateral symmetry, a segmented body, a ventral heart. They does not have dorsal heart.
236. Animals in which the cells are arranged in two embryonic layers are called ________.

1. Diploblastic
2. Extoderm
3. Tripoblastic
4. Endoderm

Option “1” is correct
Diploblastic cells are having a body derived from only two embryonic cell layers (ectoderm and endoderm, but no mesoderm), as in sponges and coelenterates.
237. ___________ being a higher category, is the assemblage of families which exhibit a few similar characters.

1. Order
2. Species
3. Genus
4. Class

Option “1” is correct
Order being a higher category, is the assemblage of families which exhibit a few similar characters
238. Sexual reproduction in Algae that takes place through fusion of two dissimilar size gametes is called?

1. Zoospores
2. Anisogamous
3. Isogamous
4. Oogamous

Option “2” is correct
Anisogamy (also called heterogamy) is the form of sexual reproduction that involves the union or fusion of two gametes, which differ in size and/or form. Sexual reproduction in Algae that takes place through fusion of two dissimilar size gametes is called Anisogamous.
239. Through photosynthesis at least a half of the total carbon dioxide fixation on earth is carried out by?

1. Pteridophytes
2. Bryophytes
3. Algae
4. Gymnosperms

Option “3” is correct
Algae are the most important photosynthesizing organisms on earth. At least half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.
240. Locust, Butterfly, Scorpion and Prawn are all examples of which Phylum?

1. Annelida
2. Chordata
3. Arthropoda
4. Platyhelminthes

Option “3” is correct
An Arthropoda is an invertebrate animal having an exoskeleton(external skeleton), a segmented body, and paired jointed appendages. Locust, Butterfly, Scorpion and Prawn are all examples of Arthropoda phylum.
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48 thoughts on “Biology”

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