Download PDF – Basics of Biology MCQs Practice Test #1 | General Science quiz

Basics of Biology MCQs Practice Test #1 | General Science quiz

Q1. The red colour of the red sea is because of-

A) Red Algae

B) Brown algae

C) Cephaleuros

D) Trichodesmium erithraeum

Answer: (D)

Trichodesmium erithraeum is a species of cyanobacteria that are  Blue-green Algae also called sea sawdust. The red colour predominates due to the excess of C-Phycoerythrin in these algae.

Q2. The age of the tree can be calculated by-

A) counting number of branches

B) measuring its girth

C) counting the number of annual rings

D) measuring its height

Answer: (C)

Annual rings shows the amount of wood produced during one season. Each year the trees produce new cells and arranged in concentric circles called as annual ring or growth rings. by counting these circles/ rings we can calculate the average age of a tree.

Q3. Thrombosis is a disease of the-

A) Thyroid gland

B) blood

C) brain

D) lungs

Answer: (B)

Thrombosis of a disease of blood coagulation forms blood clots and blocks veins or arteries. 

Q4. Which is collip's hormone?

A) Thyroxine

B) Parathormone

C) Insulin

D) Esterogen

Answer: (B)

The hormone released from the parathyroid gland is called parathormone, parathyroid hormone (PTH), or hypercalcemic hormone. It is discovered by Philips Collip, hence called Collip's hormone. parathormone helps to maintain blood calcium levels along with calcitonin hormone.

Q5. Stomata are bound by a pair of guard cells. Stomata close when guard cells become-

A) Turgid

B) flacid

C) half flacid

D) small

Answer: (B)

Stomata control the exchange of gases in leaves and also controls the loss and absorption of water. closing and opening of stomata depend on the action of guard cells. In light guard, cells absorb water, become turgid and the stoma opens. In the dark, the guard cells lose water, become flaccid and the stoma closes.

Q6. Which of the following can be used for the biological control of musquitoes?

A) Oil

B) DDT

C) Gamaxene

D) Gambusia

Answer: (D)

Gambusia is a species of freshwater fish used for the biological control of muscquitoes.  Gambusia is also named mosquitofish because the fish eats mosquito larvae.

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