11. How many chromosomes are present in human beings?
[A] 44
[B] 46
[C] 48
[D] 42
Show Answer
Correct Answer: B [46]
Notes:
Human beings have 46 chromosomes in their cells. 22 pairs of autosomes and 2 special chromosomes called sex chromosomes are present.
12. Who is known as the ‘God of plants’?
[A] Soma
[B] Varuna
[C] Rudra
[D] Indra
Show Answer
Correct Answer: A [Soma]
Notes:
Soma is also known as the God of plants or the king of gods or the special god of the Brahmanas. All the hymns of the eleventh mandal are assigned to him. Aryans considered Himalaya as the source of the soma plant.
13. Which of the following branch of biology deals with the study of mycoplasma?
[A] Mycoplasmology
[B] Limnology
[C] Ethnobotony
[D] None of these
Show Answer
Correct Answer: A [Mycoplasmology]
Notes:
Mycoplasma is a genus of bacteria that do not have a cell wall surrounding the cell membrane.
14. Who among the following discovered Vitamin C?
[A] Albert Szent-Györgyi
[B] Funk
[C] Evans and Bishop
[D] Henrik Dam
Show Answer
Correct Answer: A [Albert Szent-Györgyi]
Notes:
Albert Szent-György is the scientist who discovered Vitamin C. Vitamin C is a water-soluble vitamin. The chemical name is Ascorbic acid.
15. Which of the following is a type of Monera Kingdom?
[A] Bacteria
[B] Mushroom
[C] Euglena
[D] Mucor
Show Answer
Correct Answer: A [Bacteria]
Notes:
Bacteria comes under Monera kingdom, Mushroom and Mucor are part of Fungi.
16. In which of the following organisms is the nuclear membrane absent?
[A] Nostoc
[B] Volvox
[C] Agaricus
[D] Penicillium
Show Answer
Correct Answer: A [Nostoc]
Notes:
Nostoc, also known as star jelly, troll’s butter, witch’s butter, and witch’s jelly, is a genus of cyanobacteria. Nostoc does not have a nuclear membrane. This is a characteristic of prokaryotic cells, which lack a nucleus. The genetic material in these cells is found in the cytoplasm, not enclosed within a nuclear membrane. On the contrary, Volvox, Agaricus, and Penicillium are all eukaryotic organisms, hence possess a nuclear membrane.
17. Which of the following is the diploid chromosome number found in bryophytes?
[A] Spore mother cell
[B] Gametes
[C] Spores
[D] Meiospores
Show Answer
Correct Answer: A [Spore mother cell]
Notes:
Spore mother cell is the diploid chromosome number found in bryophytes.
18. Which gas is taken in by plants in the process of photosynthesis?
[A] Oxygen
[B] Carbon dioxide
[C] Nitrogen
[D] Argon
Show Answer
Correct Answer: B [Carbon dioxide]
Notes:
During photosynthesis, plants take in carbon dioxide, water, and sunlight and release oxygen. Photosynthesis occurs in Chloroplasts in presence of chlorophyll pigment.
19. The structural unit of photosynthesis is___.
[A] Thylakoid
[B] Grana
[C] Chlorophyll
[D] None
Show Answer
Correct Answer: A [Thylakoid]
Notes:
Thylakoid is the structural unit of photosynthesis and it is present in the stroma, stroma is present in the inner structure of the chloroplast.
20. Which of the following pair is not correctly matched?
[A] Arthropoda – spiders
[B] Mollusca – oysters
[C] Echinodermata – Starfish
[D] Chordata – snails
Show Answer
Correct Answer: D [Chordata – snails]
Notes:
Snail is an example of Phylum Mollusca. Their body is divided into head, legs and visceral mass and their head consist of antennae with eyes. They have an open circulatory system.
