A) thalamus or petal B) placenta C) connective D) anther Answer:A) thalamus or petal Explanation: The proximal end of the filament of stamen is... View Article
A) Some reptiles have also been reported as pollinators in some plant species B) Pollen germination and pollen tube growth are regulated by... View Article
A) insects or wind B) water C) bats D) birds Answer:A) insects or wind Explanation: In most aquatic plants, flowers grow out of the water and... View Article
A) there are numerous antipodal cells B) egg has a filiform apparatus C) a small central cell is present in that embryo sac D) reduction... View Article
A) hydrophily B) entomophily C) anemophily D) cleistogamy Answer:B) entomophily Explanation: Entomophily refers to the pollination by insects.... View Article
A) embryo sac B) endosperm C) ovule D) embryo Answer:A) embryo sac Explanation: The megaspore mother cell (MMC) in the megasporangium (ovule)... View Article
A metaphase chromosome is ideal to study the chromosome structure as it becomes thick and short due to condensation. A chromosome at metaphase is... View Article
During fertilization, random fusion of gametes occurs. For instance, when sperm with 22A+X fuses with the egg which has 22A+X, the zygote will... View Article
Y chromosome is the sex chromosome found only in males. It is acrocentric and measures about 2 mm in length. However, this chromosome displays... View Article
Trisomics are classified as primary, secondary and tertiary trisomics. Primary trisomic is the one with the extra chromosome being normal in... View Article
It is synthesized by plant cells and stored in different parts of the plant body. They are in the form of carbohydrates, oils, fats and proteins.... View Article
Chloroplasts are bound by two unit membranes that are smooth. The inner membrane encloses the stroma or matrix and the grana. The stroma contains... View Article
It is formed internal to the primary cell wall and is found only in some mature and highly specialized cells. They are thick, permeable and... View Article
It is the other name for a nuclear envelope. The nucleus is surrounded by a double membrane structure known as a nuclear envelope whose membranes... View Article
They are non-living substances or ergastic substances which are found in the cytoplasm. Typically, they are in the form of oil drips, glycogen... View Article
Space between outer and inner membranes in mitochondria is called peri mitochondrial space. The lumen of the mitochondrion is filled with matrix... View Article