BIOLOGY 1.5 Marks Questions

Bacillus thuringiensis produces an endotoxin which when ingested and released in the gut of the larvae of insect pest disrupts its gut lining and thus caterpillars are killed. By killing the caterpillars, it helps in pest control.

A-Leydig's cell
B- Sertoli cell
C- Spermatogenesis (Formation of sperms)
D- Spermiogenesis (Transformation of spermatid into sperm)

i. Valine: GUU, Proline: CCU
ii. Nucleotides of DNA strand: TAC AAA TAC GGA CAA AGA ATT
iii. UAA: Stop

No, as GMO may pose some threat to environment or living organism. I will ask her to approach GEAC as GEAC is responsible for approval of proposals relating to release of genetically engineered organisms and products into the environment including experimental field trials.
Values
→ Sense of responsibility.
→ Understanding

Longitudinal section of a flower showing growth of pollen tube
Synergids and egg cell are the components of egg apparatus.

Lactic Acid Bacteria (LAB) or Lactics constitute a diverse group of microorganisms associated with plants, meat, and dairy. They are used in the manufacture of dairy products such as acidophilus milk, yogurt, buttermilk, and cheeses.
Role of LAB in human stomach:
lactic acid bacteria have a number of well-established benefits. They can improve lactose digestion, play a role in preventing and treating diarrhea and act on the immune system, helping the body to resist and fight infection. It play a very beneficial role in checking disease-causing microbes