Download App

Organisms and Populations — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYOrganisms and Populations3 Marks
Question
Explain brood parasitism with the help of an example.
✓

Answer

  1. Brood parasitism refers to the phenomenon in which a (parasitic) bird species lays its eggs in the nest of another (host) bird species and lets the host incubate them.
  2. The eggs of the parasitic bird must have evolved resemblance to the eggs of the host in size and colour to reduce the chances of the host bird detecting the foreign eggs and ejecting them from the nest, e.g. the cuckoo lays its eggs in the nest of a crow.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Organisms and Populations→Organisms and Populations — all question types→BIOLOGY STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

  1. A bacterial cell is shown in the figure given below. Label the part 'A' and 'B'. Also mention the use of part 'A' in rDNA technology.

  1. Suppose a linear DNA fragment and a plasmid has three restriction sites for EcoRI. How many fragments will be produced from linear DNA and plasmid, respectively.
→
Explain the role of baculoviruses as biological control agents. Mention their importance in organic farming.
→
How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?

Or

How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidogyne incognita?

→
Name the scientific term used for the membrane that surrounds an ovum.
→
Draw the diagram of a microsporangium and label its wall layers. Write briefly on the role of the endothecium.
→
How does $\beta$-galactosidase coding sequence act as a selectable marker? Explain. Why is it a preferred selectable marker to antibiotic resistance genes?
→
Construct an ideal pyramid of energy when 10,00000 J of sunlight is available. Label all its levels.
→
When a cross in made between tall plant with yellow seeds (TtYy) and tall plant with green seed (Ttyy), what proportions of phenotype in the offspring could be expected to be,
  1. Tall and green.
  2. Dwarf and green.
→
Explain the changes that milk undergoes when suitable starter/ inoculum is added to it. How does the end product formed prove to be beneficial for human health?
→
Enumerate the steps which are involved in recombinant DNA technology.
→