Biology MCQs (Multiple Choice Questions) with answers for various state exams and UPSC civil services, SSC, banking, MPSC, UPPSC, MPPSC etc. Competitive Exams. Learn and prepare Objective type Questions on Biology.
1. Which of the following is the correct match?
Amyloplasts store carbohydrates.
Elaioplast store proteins.
Aleuroplasts store oils and fats.
All of the above.
Answer: (a) Amyloplasts store carbohydrates.
Solution: The Leucoplasts are colourless plastids of varied shapes and size that store nutrients in plants. Amyloplasts store carbohydrates, Elaioplasts store oils, and fats, and Aleuroplasts store proteins.
2. Which of the following first observed the ribosomes?
Answer: (d) George Palade.
Solution: The ribosomes which are the granular structures present in the Endoplasmic Reticulum are first observed under the electron microscope as dense particles by George Palade.
3. Which among the following is the correct sequence of stages of cell mitosis?
Prophase, Anaphase, Metaphase, and Telophase.
Prophase, Metaphase, Anaphase, and Telophase.
Anaphase, Metaphase, Telophase, and Prophase.
Telophase, Anaphase, Metaphase, and Prophase.
Answer: (b) Prophase, Metaphase, Anaphase, and Telophase.
Solution: Mitosis is the process of cell division where the number of chromosomes in the parent and progeny cells is the same. It is divided into four stages even if there is no clear-cut division between each stage. They are prophase, metaphase, anaphase, and telophase.
4. The proteins that form huge pores in the outer membranes of the plastids, mitochondria, and some bacteria are allowing molecules up to the size of small proteins, to pass through is called
Answer: (a) Porins.
Solution: The Porins are proteins that form huge pores in the outer membranes of the plastids, mitochondria, and some bacteria allowing molecules up to the size of small proteins to pass through.
5. The diffusion of water across a semi-permeable membrane is called
Answer: (c) Osmosis.
Solution: The diffusion of water across a semi-permeable membrane is called osmosis. It occurs spontaneously in response to a driving force. The net direction and rate of osmosis depend on both the pressure gradient and concentration gradient.