List of top Biology Questions

How many water molecules are released as byproducts in the Krebs cycle of cellular respiration?

During puberty, how many primary follicles are typically present in the ovaries of a female?

During which phase of its life cycle does the Plasmodium parasite enter the human body when a female Anopheles mosquito bites a human?

Which of the following hormones plays a key role in kidney osmoregulation by promoting water reabsorption in the collecting ducts?

Which of the following structures in the kidney is primarily responsible for the reabsorption of water and solutes from the filtrate?

Which of the following structures is responsible for the production of sperm in the male reproductive system?

Which disease is primarily spread by female Anopheles mosquitoes?

Which region of the brain plays a crucial role in regulating glomerular filtrate by influencing the release of hormones involved in kidney function?

In a trihybrid cross involving three different genes (\( AaBbCc \times AaBbCc \)), what is the expected genotypic ratio among the offspring?

In a family, a man with hemophilia, a genetic disorder where blood doesn't clot properly, marries a woman who is a carrier of the gene but does not express the disorder. What is the probability that their son will have hemophilia?

What percentage of the world's area does India occupy?

To increase wool production and to improve the quality of wool, the bacterial genes concerned with biosynthesis of cysteine amino acids involved in formation of keratin protein found in wool are cloned and introduced in sheep.

Which of the following codons codes for the amino acid phenylalanine?

Which of the following best describes the sympathetic pathway's effect on the glomerulus in the kidney?

Which of the following terms describes the normal type of chromosome arrangement where an organism has the correct number of chromosomes?

In DNA fingerprinting, which of the following techniques is used to amplify specific regions of DNA for analysis?

The annual net primary productivity of the biosphere is approximately:

Match the type of adaptation given in List-I with their examples given in List-II. Select the option showing correct combination

List-I (Types of adaptation)		List-II (Examples)
1	Biochemical adaptation	p	Desert lizards
2	Behavioural adaptation	q	Deep sea fishes
3	Physiological adaptation	r	Opuntia
4	Morphological adaptation	s	Kangaroo rats

The sequence of communities of primary succession in water is:
(A) Phytoplanktons → Scrubs → Free floating hydrophytes → Rooted hydrophytes → Grasses → Trees.
(B) Phytoplanktons → Free floating hydrophytes → Rooted hydrophytes → Trees → Scrubs.
(C) Free floating hydrophytes → Scrubs → Phytoplanktons → Rooted hydrophytes → Grasses → Trees.
(D) Phytoplanktons → Rooted hydrophytes → Free floating hydrophytes → Reed swamps → Marsh meadows → Scrubs → Trees.

The natural reservoir of phosphorus is:

Which of these enzymes is required to cleave a plasmid?

Select the correct statement from the following:

The chemical substances produced by some microbes which can kill or retard the growth of other microbes are known as: