Question
Draw and explain expanding age pyramid of human population. Why is it so called?
✓
Answer
- In this pyramid, the number of individuals in the pre-reproductive stage is more than that in the reproductive stage; hence, the population will be increasing steadily as there will be more individuals in the reproductive phase in future.
- Since population will expand steadily, it is called so.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
How does Agrobacterium tumefaciens act as a suitable vector in biotechnology experiments? Cite an example, where it has been successfully used as a vector.
On a visit to a Hill station, one of your friends suddenly became unwell and felt uneasy.
- List two symptoms, you would look for, to term it to be due to allergy.
- Explain the response of the body to an allergen.
- Name two drugs that can be recommended for immediate relief.
Alien species are highly invasive and are a threat to indigenous species. Substantiate this statement with any three examples.
AtRNA is charged with the amino acid methionine.
- Name the process involved in attachment.
- Point out the mRNA codon and anticodon on tRNA for this amino acid.
- Name the enzyme responsible for this attachment.
- Why is Taq polymerase used instead of ordinary DNA polymerase in polymerase chain reaction (PCR)? Name the source organism of Taq polymerase.
- What is PCR used for?
Given below is a figure of a biogas plant.
- Identify A and justify its floating nature.
- Identify the products B and C and discuss their significance.
Explain the importance of (a) Restriction endonucleases (b) 'Ori' and (c) Gel electrophoresis in recombinant DNA technology.
What does an interaction between pollen grain and its compatible stigma result in, after pollination? List two steps in sequence that follow after the process.
An organic farmer relies on natural predation for controlling plant pests and diseases. Justify giving reasons why this is considered to be a holistic approach.
Transgenic animals are the animals in which a foreign gene is expressed. Such animals can be used to study the fundamental biological process, phenomenon as well as for producing products useful for mankind. Give one example for each type.