1. Active transport is dependent on
Photosynthesis
Respiration
Photophosphorylation
None of these
✅ The correct answer is option B.
Biology
Get the best Biology MCQs with answers and explanations for exam preparation and job tests. Our collection covers cell biology, genetics, human physiology, plant biology, microbiology, biotechnology, and environmental science. These Biology multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, university entry tests, and medical admission tests. Practice online to improve your concepts and score higher with our updated and comprehensive Biology MCQs.
2. Which of the following statement about Homeostasis is incorrect
There is a definite control system that regulates the homeostatic activities
Homeostatic mechanisms keep the internal environment fixed despite wide changes in the external environment
Because of this, the fluctuations of the internal environment are of extremely narrow range as compared to that of the external environment
All are correct
✅ The correct answer is option B.
3. Which is incorrect?
Chromosomes 1st observed by Walther Fleming
Chromosomal theory of inheritance 1st formulated by Walter Sutton
1st evidence of hereditary nature of DNA provided by Friedrich Meischer
Sex chromosomes discovered by Thomas Hunt Morgan
✅ The correct answer is option C.
4. In plants, the neighbouring cells are connected with one another by.
Plasmodesmata
Cell walls
Vacuoles
Both ‘a’ & ‘b’
✅ The correct answer is option D.
5. In a hot summer afternoon, if your body’s Homeostatic machinery keep your internal temperature quite lower than that of external than this is an example of
Positive feedback
Negative feedback
Feedback
Osmoregulation
✅ The correct answer is option B.
6. A chromosome is made of
2 chromatids +1 centromere +secondary constriction
1 chromatids + 1 centromere + primary constriction
2 chromatids + 1 centromere + primary constriction
2 chromatids + 2 centromere + secondary constriction
✅ The correct answer is option A.
7. In the root cells _______ pathway becomes discontinuous in the endodermis due to the presence of casparian strip.
Tonoplast
Apoplast
Symplast
Vacuolar
✅ The correct answer is option B.
8. In osmosis water molecules move from area of _______ to _______ through semipermeable membrane
Higher solute concentration to lower solute concentration
Lower solute concentration to higher solute concentration
Lower solvent concentration to higher solvent concentration
All of these
✅ The correct answer is option B.
9. Chromosomes are composed of
40% protein and 60% DNA
50% protein and 50% DNA
70% protein and 30% DNA
60% protein and 40% DNA
✅ The correct answer is option D.
10. Cytoplasmic strands that extend through pores in adjacent cell walls are known as
Pseudopods
Symplasts
Plasmodesmata
Pili
✅ The correct answer is option C.