Last seen: Jan 13, 2022
(c) mitochondria and chloroplasts Explanation: DNA is present in mitochondria and chloroplasts (extranuclear DNA). So these organelles are self r...
(d) movement of substances between cells. Explanation: Plasmodesmata are small fuses that connect plant cells to each other, providing living brid...
(a) telocentric Explanation: When centromere is located at the tip of the chromosome, it is said to be telocentric.
(c) Metchnikoff Explanation: The phagocytosis was first of all seen by Metchnikoff in 1893. Phagocytosis is a process whereby certain cells & ...
(a) Peroxisome Explanation: Leaf peroxisomes are associated with endoplasmic reticulum, chloroplast and mitochondria and are involved in photoresp...
(a) mesosome Explanation: In bacteria, mesosome helps in cell respiration.
(a) Lysosome Explanation: Lysosome consists of hydrolytic enzymes, enclosed in a unit membrane.
(d) all of the above Explanation: Prokaryotic cells, among the tiniest of all cells, has one envelope system with no membrane lined internal organ...
(a) metacentric Explanation: Metacentric chromosomes have equal sized chromatids i.e. they have centromere in the centre.
(b) lysosomes Explanation: Lysosomes are spherical, single membrane limited vesicles, containing hydrolytic enzymes working at acidic pH. Lysosome...
(d) all of these Explanation: Double membrane organelles of the cell are mitochondria, chloroplast and nucleus.
(b) Knoll and Ruska Explanation: Electron microscope was invented by Knoll and Ruska in 1932.
(c) ribosome Explanation: Rough endoplasmic reticulum is rough due to the presence of ribosomes at its surface. Their attachment to the ER is by m...
(d) Middle lamella Explanation: Adjacent cells in a plant tissue are held together by a thin, sticky, amorphous layer of cementing tissue called m...
(c) E. R. Explanation: ER provides mechanical support and enzyme transport in a cell.
(a) nucleolus Explanation: A small spherical body attached to the particular chromosome (nucleolar chromosome) in the nucleoplasm is nucleolus. Nu...
(a) respiration Explanation: Cristae form a part of mitochondria which helps in cellular respiration.
(d) mesosome Explanation: In prokaryotic cell, cell membrane invaginate to form mesosomes. They have enzymes, which are useful for respiration.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(e) If the Assertion is incorrect but the Reason is correct. Explanation: Cartilage is a semi rigid connective tissue that is weaker than bone, bu...