Share & grow the world's knowledge!
We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
“Excessive use of chemicals and pesticides in agriculture adversely affect the environment.’’ Justify this statement.
Excessive use of chemicals and pesticides in agriculture harms the environment because these substances contaminate soil, water, and air. They kill beneficial microorganisms and insects, reduce soil fertility, and enter the food chain, affecting animals and humans. Persistent chemicals accumulate inRead more
Excessive use of chemicals and pesticides in agriculture harms the environment because these substances contaminate soil, water, and air. They kill beneficial microorganisms and insects, reduce soil fertility, and enter the food chain, affecting animals and humans. Persistent chemicals accumulate in ecosystems, causing long-term damage. Overuse also leads to pesticide resistance in pests, forcing farmers to use stronger chemicals, further worsening environmental pollution and ecological imbalance.
See lessName the parts of hind-brain of the human brain. Which part of the hind-brain controls involuntary actions such as blood pressure and salivation?
The hind-brain of the human brain consists of the cerebellum, pons, and medulla oblongata. Among these, the medulla oblongata controls involuntary actions such as blood pressure, heart rate, salivation and breathing, ensuring vital bodily functions continue automatically without conscious effort. ItRead more
The hind-brain of the human brain consists of the cerebellum, pons, and medulla oblongata. Among these, the medulla oblongata controls involuntary actions such as blood pressure, heart rate, salivation and breathing, ensuring vital bodily functions continue automatically without conscious effort. It acts as a regulatory center for essential life processes, coordinating signals between the brain and spinal cord. The cerebellum mainly controls balance and coordination, while the pons assists in communication within the brain.
See lessA pure pea plant having round (R), yellow (Y) seeds is crossed with another pure pea plant having wrinkled (r), green (y) seeds. Subsequently F1 progeny is self-pollinated to obtain F2 progeny. (a) What do the seeds of F1 generation look like? (b) Give the possible combinations of traits in seeds of F2 generation. Also give their ratio. (c) State the reason of obtaining seeds of new combination of traits in F2 generation.
ANSWER: (a) All F₁ seeds are round and yellow. Genotype: RrYy. (b) Gametes from F₁: RY, Ry, rY, ry. F₂ phenotypes and ratio (from a 4×4 Punnett): Round, Yellow = 9/16 Round, Green = 3/16 Wrinkled, Yellow = 3/16 Wrinkled, Green = 1/16 (c) New trait combinations appear in F₂ because of independent assRead more
ANSWER: (a) All F₁ seeds are round and yellow. Genotype: RrYy.
(b) Gametes from F₁: RY, Ry, rY, ry.
F₂ phenotypes and ratio (from a 4×4 Punnett):
(c) New trait combinations appear in F₂ because of independent assortment of the two gene pairs during meiosis (alleles for seed shape and seed colour segregate into gametes independently), producing recombinant genotypes and the 9:3:3:1 phenotypic ratio.
See lessNeha’s uncle is always eating something or the other. He doesn’t have a fixed time table for eating. He eats whatever he gets. Due to which he suffers from heartburn and indigestion. (a) What causes acidity or indigestion of food in adults?
Acidity or indigestion in adults is mainly caused by excessive secretion of hydrochloric acid in the stomach, irregular eating habits, overeating, or eating too much spicy and oily food. This irritates the stomach lining and causes discomfort.
Acidity or indigestion in adults is mainly caused by excessive secretion of hydrochloric acid in the stomach, irregular eating habits, overeating, or eating too much spicy and oily food. This irritates the stomach lining and causes discomfort.
See lessDiscuss the role of the pancreas and bile juice in the digestion of food in human beings.
The pancreas secretes pancreatic juice containing enzymes like amylase, trypsin, and lipase that help digest carbohydrates, proteins, and fats. Bile juice, produced by the liver and stored in the gall bladder, emulsifies fats into small droplets, making it easier for lipase to act on them for compleRead more
The pancreas secretes pancreatic juice containing enzymes like amylase, trypsin, and lipase that help digest carbohydrates, proteins, and fats. Bile juice, produced by the liver and stored in the gall bladder, emulsifies fats into small droplets, making it easier for lipase to act on them for complete digestion.
See less