Flowers that have a single ovule in the ovary and are packed into inflorescence are usually pollinated by
A) wind B) bee C) water D) bat Answer: A) wind Explanation: A single ovule in the ovary, packed into an... View Article
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Attractants and rewards are required for
A) hydrophily B) entomophily C) anemophily D) cleistogamy Answer:B) entomophily Explanation: Entomophily refers to the pollination by insects. For pollination... View Article
Functional megaspore in an angiosperm develops into an
A) embryo sac B) endosperm C) ovule D) embryo Answer:A) embryo sac Explanation: The megaspore mother cell (MMC) in the... View Article
Describe The Ultrastructure Of The Eukaryotic Chromosome.
A metaphase chromosome is ideal to study the chromosome structure as it becomes thick and short due to condensation. A... View Article
What Is The Female Homogametic System?
During fertilization, random fusion of gametes occurs. For instance, when sperm with 22A+X fuses with the egg which has 22A+X,... View Article
Why Are Males Heterogametic?
Y chromosome is the sex chromosome found only in males. It is acrocentric and measures about 2 mm in length.... View Article
How Are Trisomics Classified?
Trisomics are classified as primary, secondary and tertiary trisomics. Primary trisomic is the one with the extra chromosome being normal... View Article
How Are Reserve Food Materials Synthesized?
It is synthesized by plant cells and stored in different parts of the plant body. They are in the form... View Article
What Is The Composition Of Chloroplasts?
Chloroplasts are bound by two unit membranes that are smooth. The inner membrane encloses the stroma or matrix and the... View Article
Describe The Secondary Cell Wall.
It is formed internal to the primary cell wall and is found only in some mature and highly specialized cells.... View Article
What Is Karyotheca?
It is the other name for a nuclear envelope. The nucleus is surrounded by a double membrane structure known as... View Article
What Are Cytoplasmic Inclusions?
They are non-living substances or ergastic substances which are found in the cytoplasm. Typically, they are in the form of... View Article
What Are Racker’s Particles?
Space between outer and inner membranes in mitochondria is called peri mitochondrial space. The lumen of the mitochondrion is filled... View Article
Describe The Tertiary Structure Of Proteins.
The polypeptide chain can experience additional foldings to produce the tertiary structure. To some extent, the tertiary structure is determined... View Article
Describe The Secondary Structure Of Proteins.
Most of the long polypeptide chains are coiled or folded in many ways. This level of organization is referred to... View Article
Give Examples Of Derived Proteins.
As the name suggests, derived proteins are derivatives of proteins. These proteins are obtained from simple or conjugated proteins as... View Article
How Were Nucleosides Formed?
Nucleoside is a condensation product of a nitrogen base and ribose sugar. Condensation occurs by the linkage of pyrimidine at... View Article
How RNA Occurs As Genetic Material In Some Plant Viruses?
RNA is a macromolecule with a high molecular weight. But, it is shorter than DNA. It can be either single-stranded... View Article
What Is DNA-dependent RNA Synthesis?
The RNA molecule is thread-like, straight and unbranched. The size and amount of RNA molecules differ from species to species.... View Article
How Did Chemical Evolution Occur In The Hot Dilute Soup Of Organic Substances?
In the reducing and sterile atmosphere of primordial earth, simple organic compounds could experience polymerization to produce large molecules. Simple... View Article
