An anther with malfunctioning tapetum often fails to produce viable male gametophyte. Give one reason?

Male gametophyte in angiosperms produces

Determine which of the following statements are always true, always false or ambiguous ? Give suitable reasons to justify your answer : The Earth has one Moon.

Determine which of the following statements are always true, always false or ambiguous ? Give suitable reasons to justify your answer : The Earth has one Moon.

Croaking sound is louder in male frog than female. Give reason.

Which constituent radiation of the electromagnetic spectrum is used: to photograph internal parts of a human body? Give one reason for your answer

Indiscriminate diagnostic practices using X-rays should be avoided. Give one reason.

Short Answer Questions Three mark Each (a) The diagram given below shows the transverse section of a young anther. Identify the parts a, b, c and d. (b) The developmental stages of male gametes in plants consist of microsporogenesis and male gametophyte. Arrange the following terms in their correct developmental sequence. Pollen grain Sporogenous tissue Anther Microspore tetrad Pollen mother cell Male gamete.

Alloys are used in electrical heating devices rather than pure metals. Give one reason.

A bilobed, dithecous anther has 100 microscopes mother cells per microsporangium. How many male gamepophytes this anther can produce?

What is that prevents a child to suffer from a disease he/ she is vaccinated against? Give one reason.