Sonal Chauhan

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Sonal Chauhan

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Sonal Chauhan

Asked: December 26, 2023In: Class 10 Science

DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.

DDT (dichlorodiphenyltrichloroethane) is a synthetic pesticide once widely used to control insect-borne diseases like malaria. Its environmental persistence and harmful effects led to bans in many countries.

Sonal Chauhan

Asked: December 26, 2023In: Class 10 Science

In an asexually reproducing species, if a trait X exists in 5% of a population and trait Y exists in 70% of the same population, which of the two trait is likely to have arisen earlier? Give reason.

Examples of asexually reproducing species include bacteria (binary fission), plants (runners, bulbs), and some animals (parthenogenesis). Offspring inherit genetic material from a single parent, lacking genetic variation.

Sonal Chauhan

Asked: December 26, 2023In: Class 10 Science

Rajesh observed a patch of greenish black powdery mass on a stale piece of bread. a. Name the organism responsible for this and its specific mode of asexual reproduction. b. Name its vegetative and reproductive parts.

Asexual reproduction involves the creation of offspring without the union of gametes. It results in genetically identical or nearly identical offspring to the parent, common in plants, bacteria, and fungi.

Sonal Chauhan

Asked: December 26, 2023In: Class 10 Science

State the number of sets of chromosomes present in a zygote.

Chromosomes are thread-like structures in cells containing DNA. They carry genetic information, determining an organism’s traits. Humans have 23 pairs, with one set inherited from each parent.

Sonal Chauhan

Asked: December 26, 2023In: Class 10 Science

Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.

Male gamete (sperm) is small, mobile, and contributes genetic material. Female gamete (egg) is larger, non-motile, and provides nutrients. Fusion during fertilization forms a zygote, initiating development.