Biology - Study Mode

[#221] Do plant cells have Mitochondria?
Correct Answer

(A) Yes

Explanation

Solution: Both animal and plant cells have mitochondria, but only plant cells have chloroplasts. Plants don't get their sugar from eating food, so they need to make sugar from sunlight. This process (photosynthesis) takes place in the chloroplast.

[#222] Two species occupying same or overlapping area are
Correct Answer

(C) Sympatric

Explanation

Solution: Two species occupying same or overlapping geographical areas are called as sympatric species.
The species occupying distinct geographical areas are called as allopatric species.

[#223] The ecosystem of a pond is referred as
Correct Answer

(B) Lentic

Explanation

Solution: A pond or lake ecosystem includes biotic (living) plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions. Pond and lake ecosystems are a prime example of lentic ecosystems. Lentic refers to stationary or relatively still water, from the Latin lentus, which means sluggish.

[#224] Which of the following systems in man is affected by the bite of cobra ?
Correct Answer

(B) Nervous

Explanation

Solution: The venom of elapids, including sea snakes, kraits, cobras, king cobra, mambas, and many Australian species, contains toxins which attack the nervous system, causing neurotoxicity. The person may present with strange disturbances to their vision, including blurriness.

[#225] ________ is a thyroid hormone which controls the balance of calcium in the body.
Correct Answer

(A) Calcitonin

Explanation

Solution: Calcitonin is a hormone that is produced in humans by the parafollicular cells (commonly known as C-cells) of the thyroid gland. Calcitonin is involved in helping to regulate levels of calcium and phosphate in the blood, opposing the action of parathyroid hormone.